MS Life Science — every video script, narration first

1. A sleeping cat's chest rises and falls. Which life process is that?

1. respiration ✓
2. excretion
3. reproducing

1. Here are six life processes: moving, responding, feeding, respiration, growing, excretion. Which one is missing?

1. breathing
2. sleeping
3. reproducing ✓

2. Which of these does every living thing do?

1. It grows. ✓
2. It melts.
3. It rusts.

3. Here are six life processes: moving, feeding, respiration, growing, excretion, reproducing. Which one is missing?

1. thinking
2. responding to its surroundings ✓
3. walking

4. Here are six life processes: moving, responding, respiration, growing, excretion, reproducing. Which one is missing?

1. talking
2. feeding ✓
3. sleeping

5. A goose flies south for the winter. Which life process is this?

1. moving ✓
2. respiration
3. excretion

6. A living thing uses air to release energy from its food. What is this life process called? (typed)

Accepted: respiration

7. A living thing gets rid of waste. What is this life process called? (typed)

Accepted: excretion

8. A living thing makes more of its own kind. What is this life process called? (typed)

Accepted: reproducing · reproduction · reproduce · reproduces

9. Every living thing carries out the same seven things. What are the seven called together? (typed)

Accepted: life processes · the life processes · the seven life processes · seven life processes

1. A dog's heart beats inside the dog. Is the heart an organism?

1. yes
2. no ✓

1. Is a fish's fin an organism, or a part of an organism?

1. an organism
2. a part of an organism ✓

2. Is an oak tree an organism, or a part of an organism?

1. an organism ✓
2. a part of an organism

3. Is an ant an organism, or a part of an organism?

1. an organism ✓
2. a part of an organism

4. Is an ant's leg an organism, or a part of an organism?

1. an organism
2. a part of an organism ✓

5. Theo says: "A leaf is an organism, because a leaf is alive." Is Theo correct?

1. yes
2. no ✓

6. A complete living thing that carries out all seven life processes on its own is called an… (typed)

Accepted: organism

1. On a butcher's board lie a heart, a stomach and a lung. What is each of them?

1. an organism
2. an organ ✓

1. Which is the organ: a rose leaf, or a whole rose bush?

1. a rose leaf ✓
2. a whole rose bush

2. Which is the organ: a whole rabbit, or a rabbit's kidney?

1. a whole rabbit
2. a rabbit's kidney ✓

3. Maya says: "The whole dog is an organ, because it does many jobs." Is Maya correct?

1. yes
2. no ✓

4. Diego says: "A leaf is an organ. Its one job is to make food for the tree." Is Diego correct?

1. yes ✓
2. no

5. What is an organ?

1. a complete living thing that lives on its own
2. any part of a living thing, whatever it does
3. a part of an organism with one particular job ✓

6. A part of an organism that does one particular job is called an… (typed)

Accepted: organ

1. The mouth, the stomach and the intestines work together to feed you. What is a group of organs working together on one whole-body job called?

1. an organ
2. an organ system ✓
3. an organism

1. Your ribs, your skull and your leg bones are bones. Which organ system do they make up?

1. the digestive system
2. the circulatory system
3. the respiratory system
4. the nervous system
5. the skeletal system ✓

2. Your heart pumps blood along tubes to your fingertips and back. Which organ system does this job?

1. the digestive system
2. the circulatory system ✓
3. the respiratory system
4. the nervous system
5. the skeletal system

3. You hear your name, and a nerve carries the message from your ear to your brain. Which organ system is at work?

1. the digestive system
2. the circulatory system
3. the respiratory system
4. the nervous system ✓
5. the skeletal system

4. Which organ system takes a meal apart and passes the food on to the rest of the body?

1. the digestive system ✓
2. the circulatory system
3. the respiratory system
4. the nervous system
5. the skeletal system

5. Air flows in through your nose, down your windpipe and into your lungs. Which organ system is at work?

1. the digestive system
2. the circulatory system
3. the respiratory system ✓
4. the nervous system
5. the skeletal system

6. Malik says: "The stomach is the digestive system." Is Malik correct?

1. yes
2. no ✓

7. What is an organ system?

1. one organ that does several jobs for the body
2. a part of an organism that does one particular job
3. a group of organs that work together on one whole-body job ✓

8. A group of organs that work together on one whole-body job is called an… (typed)

Accepted: organ system

1. A heart's wall is cut across. It has three layers. What is each layer?

1. a tissue ✓
2. an organ
3. an organism

1. An organ is cut open. What is inside its wall?

1. layers of different materials ✓
2. one solid material all the way through

2. Is the muscle layer of the bladder a tissue or an organ?

1. a tissue ✓
2. an organ

3. Is the whole bladder a tissue or an organ?

1. a tissue
2. an organ ✓

4. Is a whole root a tissue or an organ?

1. a tissue
2. an organ ✓

5. Is the thin outer layer of a root a tissue or an organ?

1. a tissue ✓
2. an organ

6. An organ is built from… (typed)

Accepted: tissues · tissue

7. A layer of one kind of material inside an organ is called a… (typed)

Accepted: tissue

1. Magnified, a heart's muscle layer is thousands of tiny units, all alike, all squeezing together. What is each of these units called?

1. a cell ✓
2. an organ
3. an organism

1. One muscle cell from a leg is kept on its own. Is the one cell a tissue?

1. yes
2. no ✓

2. Under a microscope, every cell in a sheet from the inside of a cheek looks like its neighbors, and every cell does the same thing: it protects the mouth. Is the sheet a tissue?

1. yes ✓
2. no

3. The skin of a leaf is thousands of flat cells, all alike, all keeping water inside the leaf. Is the leaf's skin a tissue?

1. yes ✓
2. no

4. Under a microscope, a whole kidney shows cells of several shapes; some carry liquid, and others clean it. Is the whole kidney a tissue?

1. yes
2. no ✓

5. Here is a patch seen under a microscope. Is the whole patch a cell or a tissue?

1. a cell
2. a tissue ✓

6. The dashed ring marks one small closed shape in the patch. Is the ringed shape a cell or a tissue?

1. a cell ✓
2. a tissue

7. Lin says: "Onion skin is built from cells, even though an onion is a plant." Is Lin correct?

1. yes ✓
2. no

8. Aisha says: "A tissue is one big piece of material with no smaller parts in it." Is Aisha correct?

1. yes
2. no ✓

9. Under a microscope, a tissue is thousands of tiny units, all alike. What is each one of these units called? (typed)

Accepted: cell · a cell · cells

10. A group of similar cells doing one job is called a… (typed)

Accepted: tissue · a tissue

1. A muscle cell is cut in half. Are the two halves alive?

1. yes
2. no ✓

1. Is one cell, kept on its own, alive?

1. yes ✓
2. no

2. One liver cell in a dish takes in food and gives out waste. Then the cell is cut into two pieces, and neither piece takes in food or gives out waste any more. Explain why a piece of the cell is not alive. (written)

Starter: A piece of the cell is not alive because…

Model: A piece of the cell is not alive because it can carry out no life processes. / The whole cell takes in food and gives out waste. / A piece of the cell takes in no food. / A piece of the cell gives out no waste. / A thing that can carry out no life processes is not alive. / So the whole cell is the smallest unit that is alive, and a piece of it is not.

3. Elena says: "A tissue is alive, but the cells in it are not alive." Is Elena correct?

1. yes
2. no ✓

4. A small piece is cut off a cell and left in the dish. The piece takes in no food. Is the piece alive?

1. yes
2. no ✓

5. A single skin cell is kept on its own in a warm dish. It takes in food and gives out waste. Is the skin cell alive?

1. yes ✓
2. no

6. A whole leaf is alive. Is the leaf the smallest living unit of the plant?

1. yes
2. no ✓

7. What is the smallest unit of a living thing that is itself alive? (typed)

Accepted: cell · a cell · the cell · cells

1. Onion skin, a cheek scraping and a drop of pond water go under a microscope. What do all three views show?

1. one solid block
2. one cell each
3. cells ✓

1. Is a rock made of cells?

1. yes
2. no ✓

2. Is a seaweed made of cells?

1. yes ✓
2. no

3. Is a yeast made of one or more cells?

1. yes ✓
2. no

4. Is a plastic cup made of cells?

1. yes
2. no ✓

5. Ayesha says: "Only animals are made of cells. Plants are made of wood and leaves." Is Ayesha correct?

1. yes
2. no ✓

6. Every living thing is made of one or more… Type the missing word. (typed)

Accepted: cells · cell

1. A paramecium glides across a drop of pond water on its own. Is the paramecium single-celled or many-celled?

1. single-celled ✓
2. many-celled

1. A euglena is far too small to see without a microscope, and it swims with a whip-like tail. Is a euglena single-celled or many-celled?

1. single-celled ✓
2. many-celled

2. A whole living thing from a puddle looks like this under a microscope. Is it single-celled or many-celled?

1. single-celled ✓
2. many-celled

3. Is a frog single-celled or many-celled?

1. single-celled
2. many-celled ✓

4. A tiny piece of a jellyfish looks like this under a microscope. Is a jellyfish single-celled or many-celled?

1. single-celled
2. many-celled ✓

5. Ruben says: "A single-celled living thing cannot be a whole organism, because it is only one cell." Is Ruben correct?

1. yes
2. no ✓

6. A living thing that is one cell, carrying out all seven life processes by itself, is called… (typed)

Accepted: single-celled · single celled · one-celled · unicellular

7. A living thing built from many cells working together is called… (typed)

Accepted: many-celled · many celled · multicellular · multi-celled

1. In a column of the five levels, a heart sits just below an organ system and just above a tissue. Which level is the heart?

1. an organism
2. an organ ✓
3. a cell

1. Which is larger: a cell or a tissue?

1. a cell
2. a tissue ✓

2. Which is larger: an organ system or an organ?

1. an organ system ✓
2. an organ

3. Which is larger: a tissue or an organ?

1. a tissue
2. an organ ✓

4. Which level is the brain?

1. an organism
2. an organ system
3. an organ ✓
4. a tissue
5. a cell

5. Which level is the brain together with all the nerves that run out from it?

1. an organism
2. an organ system ✓
3. an organ
4. a tissue
5. a cell

6. Which level is a lung?

1. an organism
2. an organ system
3. an organ ✓
4. a tissue
5. a cell

7. Which level is the lining of the windpipe?

1. an organism
2. an organ system
3. an organ
4. a tissue ✓
5. a cell

8. Which level is an oak tree?

1. an organism ✓
2. an organ system
3. an organ
4. a tissue
5. a cell

9. Which level is one of the tiny units that a nerve is built from?

1. an organism
2. an organ system
3. an organ
4. a tissue
5. a cell ✓

10. Type the five levels in order, from the largest to the smallest, with a comma between them. (typed)

Accepted: organism, organ system, organ, tissue, cell · organism organ system organ tissue cell · organism > organ system > organ > tissue > cell · organism → organ system → organ → tissue → cell

1. Every living thing carries out the same seven life processes. List all seven. (written)

Starter: The seven life processes are…

Model: The seven life processes are moving, responding to its surroundings, feeding, respiration, growing, excretion and reproducing.

2. A stalagmite on a cave floor grows taller as dripping water leaves stone on it. Explain why the stalagmite is non-living. (written)

Starter: The stalagmite is non-living because…

Model: The stalagmite is non-living because it can carry out only one of the seven life processes. / Dripping water leaves stone on the stalagmite, so the stalagmite grows taller. / But the stalagmite never feeds. / The stalagmite never senses its surroundings. / The stalagmite never makes new stalagmites of its own kind. / A living thing can do all seven, so the stalagmite is non-living.

3. A jar of dried yeast has sat on a shelf for a year, unchanged. In warm sugary water, the yeast feeds, grows and makes more yeast. Is the dried yeast living?

1. yes ✓
2. no

4. An owl's eye is alive. Explain why the eye is an organ and not an organism. (written)

Starter: The eye is an organ because…

Model: The eye is an organ because it is a part of the owl that does one particular job: sensing light. / The eye is built from tissues. / An organism is a complete living thing that carries out all seven life processes on its own. / The eye cannot feed, grow or live on its own. / So the eye is not an organism; the owl is the organism.

5. Which level is the stem of a tomato plant?

1. an organism
2. an organ system
3. an organ ✓
4. a tissue
5. a cell

6. A dog's ears prick up when its owner calls its name. Which life process is this?

1. moving
2. responding ✓
3. feeding
4. respiration

7. An iron gate is slowly turning rusty. Is the gate living?

1. yes
2. no ✓

8. Here is a living thing from a compost heap, seen under a microscope. Is this living thing single-celled or many-celled?

1. single-celled
2. many-celled ✓

9. Your lungs, and the tube that carries air down into them, take in air. Which organ system do they make up?

1. the digestive system
2. the circulatory system
3. the respiratory system ✓
4. the nervous system
5. the skeletal system

10. A living thing that is one cell, carrying out all seven life processes by itself, is called…

1. single-celled ✓
2. many-celled
3. a tissue
4. an organ

11. A part of an organism that does one particular job is called an… (typed)

Accepted: organ

12. A complete living thing that carries out all seven life processes on its own is called an… (typed)

Accepted: organism

13. A group of similar cells doing one job is called a… (typed)

Accepted: tissue

14. The smallest unit of a living thing that is itself alive is called a… (typed)

Accepted: cell

15. A group of organs that work together on one whole-body job is called an… (typed)

Accepted: organ system

16. Put these five levels of organization in order, from the largest at the top to the smallest at the bottom. (put in order)

Order: organism → organ system → organ → tissue → cell

1. What does the cell membrane do?

1. It moves the cell from place to place.
2. It controls what enters and leaves the cell. ✓

1. A single cell in sea water lets some particles from the water in and keeps others out. Which cell part does this choosing? Type its name. (typed)

Accepted: cell membrane · the cell membrane · a cell membrane · cell membranes

2. One cell part controls what enters and leaves the cell. Type the name of this cell part. (typed)

Accepted: cell membrane · the cell membrane · a cell membrane · cell membranes

1. A thick, watery liquid fills a cell from its edge to its center. What is this liquid called?

1. the cytoplasm ✓
2. the cell membrane

1. Which job does the cytoplasm do?

1. It controls what enters and leaves the cell.
2. It is where the cell's activities take place. ✓
3. It carries the cell from place to place.

2. Suppose a cell in your skin builds a new part. In which region of the cell does that happen?

1. the cell membrane
2. the cytoplasm ✓

3. One region of a cell is where the cell's activities take place. Type the name of this region. (typed)

Accepted: cytoplasm · the cytoplasm

1. A dark round part sits near the middle of a cheek cell. What is this dark round part called?

1. the cytoplasm
2. the nucleus ✓

1. Which job does the nucleus do?

1. It controls what enters and leaves the cell.
2. It is where the cell's activities take place.
3. It holds the cell's inherited instructions. ✓

2. A yeast cell has its nucleus removed. Does the yeast cell keep growing?

1. yes
2. no ✓

3. A frog's egg cell builds every one of its parts the right way. Which cell part held the instructions for building them?

1. the cytoplasm
2. the nucleus ✓
3. the cell membrane

4. One cell part holds the cell's inherited instructions. Type the name of this cell part. (typed)

Accepted: nucleus · the nucleus · a nucleus · nuclei

1. Hundreds of small parts crowd the cytoplasm of a muscle cell, each one releasing energy from food. What are these parts called?

1. the cell membrane
2. the nucleus
3. the mitochondria ✓

1. Which job do the mitochondria do?

1. They hold the cell's inherited instructions.
2. They release energy from food for the cell to use. ✓
3. They control what enters and leaves the cell.
4. They are where the cell's activities take place.

2. A heart cell squeezes about once every second, all day long. A fat-storing cell under the skin does little work. Which cell holds more mitochondria?

1. the heart cell ✓
2. the fat-storing cell

3. A cell from a leaf is a plant cell. Does the leaf cell have mitochondria?

1. yes ✓
2. no

4. Which cell parts release energy from food for the cell to use?

1. the nucleus
2. the cell membrane
3. the mitochondria ✓

5. One kind of cell part releases energy from food for the cell to use. Type the name of these parts. (typed)

Accepted: mitochondria · the mitochondria · mitochondrion · a mitochondrion

1. One large clear space takes up most of an onion cell. What is this clear space called?

1. the vacuole ✓
2. the nucleus

1. Which job does the vacuole do?

1. It stores water, food or waste inside the cell. ✓
2. It releases energy from food for the cell to use.
3. It holds the cell's inherited instructions.
4. It controls what enters and leaves the cell.

2. A lettuce leaf left on the counter goes limp. In each of its cells, which part has emptied?

1. the mitochondria
2. the vacuole ✓

3. This part is a thin skin around the whole cell; it lets some particles in and keeps others out. Type its name. (typed)

Accepted: cell membrane · the cell membrane · a cell membrane · cell membranes

4. A cell that squeezes all day holds hundreds of these parts, because they release the energy it needs from food. Type their name. (typed)

Accepted: mitochondria · the mitochondria · mitochondrion · a mitochondrion

5. A cell without this part has no instructions for building its parts. Type its name. (typed)

Accepted: nucleus · the nucleus · a nucleus · nuclei

6. This watery filling is where the cell breaks down its food and builds its new parts. Type its name. (typed)

Accepted: cytoplasm · the cytoplasm

7. In a plant cell this part is one large space, full of water, pressing outward and keeping the cell firm. Type its name. (typed)

Accepted: vacuole · the vacuole · a vacuole · vacuoles

1. A thin piece of glass presses down on an onion cell, and the cell keeps its box shape. Which part holds its shape?

1. the nucleus
2. the cell wall ✓

1. Which job does the cell wall do?

1. It stores water, food or waste inside the cell.
2. It controls what enters and leaves the cell.
3. It holds the plant cell's shape. ✓
4. It releases energy from food for the cell to use.

2. A cell comes from the stem of a rose. Does the cell have a cell wall?

1. yes ✓
2. no

3. A cell comes from the skin of a frog. Does the cell have a cell wall?

1. yes
2. no ✓

4. A plant cell has a cell wall. Does the plant cell also have a cell membrane?

1. yes ✓
2. no

5. A stiff layer sits outside a plant cell's cell membrane and holds the cell's shape. What is the stiff layer called?

1. the cytoplasm
2. the cell wall ✓
3. the vacuole

6. Type the name of the stiff layer outside a plant cell's cell membrane. (typed)

Accepted: cell wall · the cell wall · a cell wall · cell walls

1. Dozens of small green discs crowd the cytoplasm of a leaf cell. What are these green parts called?

1. chloroplasts ✓
2. mitochondria
3. vacuoles

1. Which job do the chloroplasts do?

1. They hold the plant cell's shape.
2. They release energy from food.
3. They store water, food or waste.
4. They make food using light. ✓

2. One cell comes from a blade of grass, and another cell comes from a potato buried in the soil. Which cell holds chloroplasts?

1. the grass cell ✓
2. the potato cell

3. Bea says: "A leaf cell has chloroplasts instead of mitochondria." Is Bea correct?

1. yes
2. no ✓

4. A cell comes from a bird's wing. Does the cell have chloroplasts?

1. yes
2. no ✓

5. Which cell parts make food using light?

1. the chloroplasts ✓
2. the mitochondria
3. the vacuole

6. Type the name of the parts of a plant cell where food is made using light. (typed)

Accepted: chloroplasts · the chloroplasts · chloroplast · a chloroplast

1. A cell came from a plant or from an animal. It has a thick second layer and small disc-shaped parts. Is it a plant cell?

1. yes ✓
2. no

1. Here is a cell drawn flat. It came from a plant or from an animal. Is this a plant cell?

1. yes
2. no ✓

2. Here is a cell drawn flat. It came from a plant or from an animal. Is this a plant cell?

1. yes ✓
2. no

3. Here is a cell drawn flat. It came from a plant or from an animal. Is this a plant cell?

1. yes ✓
2. no

4. Here is a cell drawn flat. It came from a plant or from an animal. Is this a plant cell?

1. yes
2. no ✓

5. Here is a cell drawn flat. It came from a plant or from an animal. Is this a plant cell?

1. yes
2. no ✓

6. Here is a cell drawn flat. It came from a plant or from an animal. Is this a plant cell?

1. yes ✓
2. no

7. Here is a cell drawn flat. Did it come from a plant or from an animal?

1. from a plant ✓
2. from an animal

8. Here is a cell drawn flat. Did it come from a plant or from an animal?

1. from a plant
2. from an animal ✓

9. Here is a cell drawn flat. Did it come from a plant or from an animal?

1. from a plant ✓
2. from an animal

10. Compare a plant cell with an animal cell. Which three parts does a plant cell have that an animal cell never has? Type all three names. (typed)

Accepted: cell wall, chloroplasts and one large vacuole · cell wall, chloroplasts, and one large vacuole · cell wall, chloroplasts, one large vacuole · cell wall and chloroplasts and one large vacuole

1. Why does a many-celled organism need different kinds of cell?

1. One kind of cell could not do every job well. ✓
2. One kind of cell would run out of energy.

1. A muscle cell is long and can shorten. Which job does its shape fit?

1. squeezing ✓
2. carrying signals a long way
3. covering the body

2. A honeybee has cells in its wing muscles and cells in its eyes. Explain why one kind of cell could not do both jobs. (written)

Starter: One kind of cell could not do both jobs because…

Model: One kind of cell could not do both jobs because each kind of cell is shaped for its one job. / A wing-muscle cell is long, so it can shorten and squeeze to beat the wing. / An eye cell has to let light in and sense it. / A cell shaped to shorten and squeeze could not also catch light well. / So the honeybee needs cells of different kinds.

3. A cell in a plant's root has a long thin part, like a hair, that reaches out between the grains of soil. Which job does its shape fit?

1. making food using light
2. carrying signals a long way
3. taking in water ✓

1. An elephant is far bigger than a mouse. What makes the elephant bigger?

1. The elephant has much bigger cells.
2. The elephant has many more cells. ✓

1. A Great Dane is far bigger than a Chihuahua. Does the Great Dane have more cells, or bigger cells?

1. more cells ✓
2. bigger cells

2. A tadpole grows into a frog far bigger than itself. Are the frog's cells much bigger than the tadpole's cells?

1. yes
2. no ✓

3. A sapling grows into a full-grown oak. How does the oak get so much bigger?

1. by adding more cells ✓
2. by making its cells bigger

4. A child grows into an adult. Does the adult have more cells than the child?

1. yes ✓
2. no

5. A blue whale is far bigger than a dolphin. Which is true of the whale's skin cells?

1. They are far bigger than the dolphin's skin cells.
2. They are about the same size as the dolphin's skin cells. ✓

1. Which job does the nucleus do?

1. It controls what enters and leaves the cell.
2. It stores water, food or waste inside the cell.
3. It holds the cell's inherited instructions. ✓
4. It releases energy from food for the cell to use.

2. Here is a cell drawn flat. Did it come from a plant or from an animal?

1. from a plant ✓
2. from an animal

3. A horse is far bigger than a rabbit. Does the horse have more cells, or bigger cells?

1. bigger cells
2. more cells ✓

4. Which job do the mitochondria do?

1. They release energy from food for the cell to use. ✓
2. They make food using light.
3. They hold the plant cell's shape.
4. They control what enters and leaves the cell.

5. Here is a cell drawn flat. Did it come from a plant or from an animal?

1. from a plant
2. from an animal ✓

6. A single cell in pond water begins to leak: its insides spill out into the water around it. Which cell part has stopped working?

1. the nucleus
2. the vacuole
3. the cell membrane ✓

7. A cell comes from the stem of a daisy. Does the cell have a cell membrane?

1. yes ✓
2. no

8. Which job does the cell wall do?

1. It makes food using light.
2. It holds the plant cell's shape. ✓
3. It is where the cell's activities take place.
4. It stores water, food or waste inside the cell.

9. A salmon has gill cells that take in the air dissolved in the water, and muscle cells that squeeze so the salmon can swim. Explain why one kind of cell could not do both jobs. (written)

Starter: One kind of cell could not do both jobs because…

Model: One kind of cell could not do both jobs because each kind of cell is shaped for its one job. / A gill cell is thin and flat, so the air dissolved in the water passes through it quickly. / A muscle cell is long, so it can shorten and squeeze. / A thin, flat cell could not shorten and squeeze well. / So the salmon needs cells of different kinds.

10. Here is a cell drawn flat. Did it come from a plant or from an animal?

1. from a plant ✓
2. from an animal

11. Every other part of a cell sits in this watery filling, and the cell does its work in it. Type its name. (typed)

Accepted: cytoplasm · the cytoplasm

12. A cell keeps spare water and stored food in this part, and its waste too. Type its name. (typed)

Accepted: vacuole · the vacuole · a vacuole · vacuoles

13. A plant cell in the light makes its food inside these small parts. Type their name. (typed)

Accepted: chloroplasts · the chloroplasts · chloroplast · a chloroplast

14. Everything that enters or leaves a cell must pass through this thin outer part. Type its name. (typed)

Accepted: cell membrane · the cell membrane · a cell membrane · cell membranes

1. A kitten grows a longer tail. Which job is its food doing?

1. a source of energy
2. a source of material ✓

1. A snake lies still in the sun all day, and it stays alive. Which job is its food doing?

1. a source of energy ✓
2. a source of material

2. A sunflower grows 30 cm taller in a week. Which job is its food doing?

1. a source of energy
2. a source of material ✓

3. A boy grows 5 cm taller in a year. Which job is his food doing?

1. a source of energy
2. a source of material ✓

4. A bird flies 3,000 km south for the winter. Which job is its food doing?

1. a source of energy ✓
2. a source of material

1. A deer eats leaves from a bush. Is the deer an autotroph or a heterotroph?

1. a heterotroph ✓
2. an autotroph

1. A moss grows in a damp patch on a wall. Is the moss an autotroph or a heterotroph?

1. a heterotroph
2. an autotroph ✓

2. A water lily floats on a pond. Is the water lily an autotroph or a heterotroph?

1. a heterotroph
2. an autotroph ✓

3. A gray mold spreads over a slice of old bread. Is the mold an autotroph or a heterotroph?

1. a heterotroph ✓
2. an autotroph

4. A tiny living thing in pond water, too small to see, swallows even smaller living things. Is it an autotroph or a heterotroph?

1. a heterotroph ✓
2. an autotroph

5. Which word names a living thing that makes its own food?

1. an autotroph ✓
2. a heterotroph
3. an organism

6. A living thing that takes in food from outside its body is called a… Type the word. (typed)

Accepted: heterotroph · a heterotroph · an heterotroph · the heterotroph

1. A green plant stands in the sunlight. What does the plant do with the light?

1. It eats the light as its food.
2. It uses the light to make its food. ✓

1. A bean plant is kept in a dark cupboard and watered every day. What happens to the plant's food-making?

1. It stops. ✓
2. It slows down a little.
3. It carries on.

2. A plant in a basement sits under a bright electric lamp all night, with no sunlight at all. Can the plant make food?

1. yes ✓
2. no

3. Which word names making food using light?

1. respiration
2. photosynthesis ✓
3. excretion

4. A green plant makes its food using light. What is this process called? Type the word. (typed)

Accepted: photosynthesis · photo-synthesis · photo synthesis

1. A bean plant takes in a gas from the air through its leaves and builds its food from it. Which gas is it?

1. carbon dioxide ✓
2. oxygen

1. A plant is making food in the light. Is water one of the two things the plant builds its food from?

1. yes ✓
2. no

2. A plant is making food in the light. Is carbon dioxide one of the two things the plant builds its food from?

1. yes ✓
2. no

3. A plant is making food in the light. Is soil one of the two things the plant builds its food from?

1. yes
2. no ✓

4. A plant is making food in the light. Is light one of the two things the plant builds its food from?

1. yes
2. no ✓

5. A plant is making food in the light. Is oxygen one of the two things the plant builds its food from?

1. yes
2. no ✓

6. Where does a potted plant get the water it builds its food from?

1. from the soil ✓
2. from the air
3. from the light

7. Where does a plant get the carbon dioxide it builds its food from?

1. from the air ✓
2. from the soil
3. from the light

8. Jace says: "A plant takes in its food from the soil, through its roots." Is Jace correct?

1. yes
2. no ✓

1. A plant makes glucose in the light. What does the plant do with the glucose?

1. It lets the glucose out into the air.
2. It keeps the glucose as its food. ✓

1. A plant makes food in the light. Is oxygen one of the two things photosynthesis makes?

1. yes ✓
2. no

2. A plant makes food in the light. Is glucose one of the two things photosynthesis makes?

1. yes ✓
2. no

3. A plant makes food in the light. Is carbon dioxide one of the two things photosynthesis makes?

1. yes
2. no ✓

4. A plant makes food in the light. Is water one of the two things photosynthesis makes?

1. yes
2. no ✓

5. A green plant is sealed inside a clear jar and left in the light. What happens to the amount of oxygen in the jar?

1. It goes down.
2. It stays the same.
3. It goes up. ✓

6. A water plant in a sunlit fish tank gives off a stream of tiny bubbles. Which gas are the bubbles?

1. carbon dioxide
2. oxygen ✓

7. Which word names the sugar a plant makes and keeps as its food?

1. carbon dioxide
2. glucose ✓
3. oxygen

8. A plant makes a sugar and keeps it as its food. What is the sugar called? Type the word. (typed)

Accepted: glucose

1. A word equation has an arrow in the middle. How do you read the arrow?

1. react to make ✓
2. is the same as
3. is heavier than

1. In the word equation for photosynthesis, on which side of the arrow does oxygen stand?

1. on the left of the arrow
2. on the right of the arrow ✓

2. In the word equation for photosynthesis, on which side of the arrow does water stand?

1. on the left of the arrow ✓
2. on the right of the arrow

3. Which two things are needed for photosynthesis but are not written as substances in the word equation?

1. light and chlorophyll ✓
2. soil and water
3. oxygen and heat

4. The green substance in a leaf that catches the light is called… Type the word. (typed)

Accepted: chlorophyll · chlorophyl · clorophyll

5. Type the word equation for photosynthesis, with an arrow (->) between what goes in and what comes out. (typed)

Accepted: carbon dioxide + water → glucose + oxygen · carbon dioxide + water -> glucose + oxygen · carbon dioxide + water react to make glucose + oxygen · carbon dioxide + water reacts to make glucose + oxygen

1. A plant's leaves make glucose in the light. Does the plant make energy, or store energy?

1. It makes new energy.
2. It stores energy from the light. ✓

1. A leaf makes glucose in the light. What happens to the energy from the light?

1. It is stored in the glucose. ✓
2. It is used up and gone.
3. It turns into oxygen.

2. A potato grows underground, in the dark, yet the potato holds stored energy. Explain where that energy came from. (written)

Starter: The energy in the potato came from…

Model: The energy in the potato came from the light that fell on the potato plant's leaves. / Light carries energy. / The leaves made glucose using that light, and the energy from the light went into the glucose. / The energy is stored in the glucose as chemical energy. / The plant built the potato from that glucose. / So the potato holds chemical energy that came from the light.

3. Dry grass burns in a wildfire: the fire heats the air and gives out light. Where did the energy in the grass come from?

1. from the soil the grass grew in
2. from the light that fell on the grass ✓
3. from the air around the grass

4. Which term names energy stored in a substance, such as the energy in glucose?

1. energy from the light
2. energy from the fire
3. chemical energy ✓

5. Energy stored in a substance, such as the energy in glucose or in wood, is called… Type the two words. (typed)

Accepted: chemical energy · chemical · stored chemical energy

1. A willow grows in a pot of dried soil for five years, given only rainwater. What happens to the mass of the soil?

1. It barely changes. ✓
2. It falls by as much as the tree gains.

1. The dried soil had a mass of 90.72 kg when the willow was planted and 90.66 kg five years later. How much mass did the soil lose? Type the number in kg. (typed)

Accepted: 0.06 · 0.06 kg · 0.06kg · 0.060

2. A small willow grows in a pot of soil for five years, given only rainwater. Its mass rises from 2.3 kg to 76.7 kg, while the soil loses only 0.06 kg. Where did the new wood, roots and leaves come from?

1. from the air and the water ✓
2. from the soil and the stones in it
3. from the sunlight and its warmth

3. Duckweed floats on a pond with no soil at all, and in one week its mass doubles. Explain where the new mass comes from. (written)

Starter: The duckweed's new mass comes from…

Model: The duckweed's new mass comes from the air and the water. / The duckweed takes in carbon dioxide from the air and water from the pond. / Its leaves build the carbon dioxide and water into glucose, using light. / The duckweed builds the glucose into new leaves and roots. / There is no soil, so none of the new mass can have come from soil.

4. A field of corn is harvested, and the soil in the field is barely lighter than before. Wren says: "Most of the corn's mass came from the air and the water, not from the soil." Is Wren correct?

1. yes ✓
2. no

5. A young willow has a mass of 2.3 kg. Five years later the same tree has a mass of 76.7 kg. How much mass did the tree gain, in kg? (typed)

Accepted: 74.4 · 74.4 kg · 74.4kg · 74.4 kilograms

6. Suppose a tomato plant grows in a pot for one summer. The chart shows the mass of the plant and of the soil in its pot at the start and at the end. Which mass changed the least?

1. the tomato plant's mass
2. the soil's mass ✓

1. A tadpole grows into a frog ten times its mass. Which job is its food doing as it grows?

1. a source of energy
2. a source of material ✓

2. A thick layer of fallen leaves covers a small pond for a month and blocks all the light from the water plants below. What happens to photosynthesis in the water plants?

1. It stops. ✓
2. It slows down a little.
3. It carries on.

3. A sugar cane plant stores sugar in its thick stem. Where did the energy stored in that sugar come from?

1. from the light that fell on its leaves ✓
2. from the water its roots took in
3. from the soil it grew in

4. Making food using light is called… Type the word. (typed)

Accepted: photosynthesis · photo-synthesis · photo synthesis

5. Type the word equation for photosynthesis, with an arrow (->) between what goes in and what comes out. (typed)

Accepted: carbon dioxide + water → glucose + oxygen · carbon dioxide + water -> glucose + oxygen · carbon dioxide + water react to make glucose + oxygen · carbon dioxide + water reacts to make glucose + oxygen

6. A cactus grows in a desert, in the sun, and makes its own food. Which word names a living thing that gets its food this way? Type the word. (typed)

Accepted: autotroph · a autotroph · an autotroph · the autotroph

7. A caterpillar eats leaves all day. Which word names a living thing that takes in its food like this? Type the word. (typed)

Accepted: heterotroph · a heterotroph · an heterotroph · the heterotroph

8. A plant makes a sugar in its leaves and keeps it as its food. What is the sugar called? Type the word. (typed)

Accepted: glucose

9. What is the green substance in a leaf that catches the light called? Type the word. (typed)

Accepted: chlorophyll · chlorophyl · clorophyll

10. A log holds energy. When the log burns, the fire heats the room and gives out light. What is the energy stored in the log called? Type the two words. (typed)

Accepted: chemical energy · chemical · stored chemical energy

11. A potted plant gains 2 kg over a year, while the soil in its pot loses a few grams. Explain where the 2 kg came from, and how you know. (written)

Starter: The 2 kg came from…

Model: The 2 kg came from the air and the water the plant took in. / The plant took in carbon dioxide from the air, through its leaves, and water from the soil, through its roots. / Its leaves built the carbon dioxide and water into glucose, using light. / The plant built the glucose into new stem, leaves and roots. / I know the 2 kg did not come from the soil, because the soil lost only a few grams, which is far too little to build 2 kg of plant.