Year 4 Science Habitats, change and food chains: check-up and practice test questions

Method. Think about changes that people make.

1. Think of a change. Cutting down a hedge is a change made by people.
   people
2. Write one change. Any one of these is a human change.
   one change
3. Write the answer.
   Accept any one change made by people, such as cutting down a hedge, building on a field, or dropping litter.

Check. A change made by people is a human change. ✓

Method. Find the biggest fall.

1. Read the falls. The biggest fall is 11, for water beetles.
   11
2. Write the answer.
   Water beetles

Check. The fall for water beetles is 15 minus 4. ✓

Method. Add the four numbers in the after column.

1. Add them. 3 plus 0 plus 20 plus 4 makes 27.
   3 + 0 + 20 + 4 = 27
2. Write the answer.
   27

Check. The total before the dry summer was 60. ✓

Method. Find the animal that is eaten.

1. Read the chain. The rabbit is eaten by the fox.
   rabbit is eaten
2. Write the answer.
   Rabbit

Check. The fox is the predator. ✓

Method. Count the gaps between the names.

1. Count the gaps. Three names have two gaps between them.
   two gaps
2. Write the answer.
   2

Check. Each arrow points from the food to the eater. ✓

Method. Think about which living things make their own food.

1. Read the key idea. The producer is the plant at the start of the chain.
   plant
2. Write the answer.
   plant

Check. Animals cannot make their own food. ✓

Method. Put the living things in order, from the food to the eater.

1. Start with the leaf. The leaf is the food for the caterpillar.
   leaf first
2. Finish with the bird. The blue tit eats the caterpillar, so it comes last.
   blue tit last
3. Write the answer.
   Leaf → Caterpillar → Blue tit

Check. The arrows point to the eater. ✓

Method. Find the animal that hunts.

1. Read the chain. The owl hunts and eats the mouse.
   owl eats mouse
2. Write the answer.
   Owl

Check. The owl is at the end of the chain. ✓

Method. Think about what a producer is.

1. Think about the grasshopper. A grasshopper eats plants, so it is an animal.
   eats plants
2. Decide. Producers are plants that make their own food, so the grasshopper is not one.
   not one
3. Write the answer.
   No. Accept any reason that says a grasshopper eats plants and cannot make its own food.

Check. Only plants are producers. ✓

Method. Think about changes that nature causes.

1. Think of a change. A flood is caused by heavy rain, not by people.
   natural
2. Write one change. Any one natural change is correct.
   one change
3. Write the answer.
   Accept any one natural change, such as a flood, a long dry summer, or the change of seasons.

Check. Natural changes happen without people. ✓

Method. Think about which living things make their own food.

1. Read the key idea. The producer is at the start of every food chain, and it is a plant.
   plant
2. Write the answer.
   plant

Check. Plants make their own food using light. ✓

Method. Count the gaps between the living things.

1. Count the gaps. Three living things have two gaps between them.
   two gaps
2. Write the answer.
   2

Check. Each arrow points to the eater. ✓

Method. Find the animal that the frog eats.

1. Read the chain. The frog eats the grasshopper, so the grasshopper is the prey.
   grasshopper
2. Write the answer.
   Grasshopper

Check. Prey is the animal that is eaten. ✓

Method. Subtract the after number from the before number.

1. Read the numbers. There were 12 frogs before, and 3 after.
   12 and 3
2. Subtract. 12 minus 3 is 9.
   12 - 3 = 9
3. Write the answer.
   9

Check. Check: 3 plus 9 makes 12. ✓

Method. Subtract the after number from the before number.

1. Read the numbers. Snails were 25 before, and 20 after.
   25 and 20
2. Subtract. 25 minus 20 is 5.
   25 - 20 = 5
3. Write the answer.
   5

Check. Check: 20 plus 5 makes 25. ✓

Method. Think about what living things need.

1. Think about the needs. Living things need water, food and a place to live.
   water, food and a place
2. Write one danger. A change that removes one of these can be dangerous.
   can be dangerous
3. Write the answer.
   Accept any one danger, such as: the water dries up, the animals get tangled in litter, or the food runs out.

Check. Any change that removes a need can be dangerous. ✓

Method. Put the living things in order, from the food to the eater.

1. Start with the food. The grass is the food for the grasshopper.
   grass first
2. Finish with the eater. The frog eats the grasshopper, so it comes last.
   frog last
3. Write the answer.
   Grass → Grasshopper → Frog

Check. The arrows point to the eater. ✓

Method. Look at who eats whom.

1. Find the predator. The owl hunts and eats the mouse, so the owl is the predator.
   Owl
2. Find the prey. The mouse is eaten by the owl, so the mouse is the prey.
   Mouse
3. Write the answer.
   Owl; Mouse

Check. The owl is the predator, and the mouse is the prey. ✓

Method. Think about where the food starts.

1. Think about plants. Plants make their own food using light, water and air.
   make their own food
2. Write the reason. Animals cannot make their own food, so they depend on plants or other animals.
   depend
3. Write the answer.
   Accept any sentence that says plants make their own food using light, and animals depend on plants for food.

Check. The chain starts with the producer, which is the plant. ✓