Primary 3 Science · Answers and explanations
Life Cycles
Use this page to check the worksheet together. Talk about why each answer is right. Total: 16 marks.
Section A · Multiple choice 5 marks
1. Which shows the life cycle of a butterfly in the correct order?
(A) Egg, pupa, caterpillar, adult(B) Egg, caterpillar, pupa, adult(C) Caterpillar, egg, adult, pupa(D) Pupa, egg, adult, caterpillar
Answer: (B) Egg, caterpillar, pupa, adultA butterfly has four stages: egg, caterpillar (larva), pupa and adult.
2. What does a young frog (tadpole) live in?
(A) On a tree(B) In water(C) Under the ground(D) In a nest
Answer: (B) In waterA tadpole lives in water and breathes with gills. The adult frog can live on land.
3. Which animal has a life cycle of three stages: egg, nymph and adult?
(A) Butterfly(B) Cockroach(C) Mosquito(D) Frog
Answer: (B) CockroachA cockroach nymph looks like a small adult. It has no pupa stage.
4. What does a seed grow into first?
(A) A fruit(B) A seedling(C) A flower(D) A leaf only
Answer: (B) A seedlingA seed germinates and grows into a seedling, then into an adult plant.
5. In the life cycle of a mosquito, which stages live in water?
(A) Egg and adult(B) Egg, larva and pupa(C) Only the adult(D) None of them
Answer: (B) Egg, larva and pupaMosquito eggs, larvae and pupae live in water. Only the adult flies. This is why we remove standing water.
Section B · Fill in the blanks 5 marks
Word bank: egg · pupa · nymph · seedling · adult
6. A caterpillar changes into a before it becomes a butterfly.
Answer: pupaThe pupa is the resting stage between caterpillar and adult.
7. A cockroach hatches from an egg as a .
Answer: nymphA nymph looks like a small adult without wings.
8. A hen's chick hatches from an .
Answer: eggMany animals begin life as an egg.
9. A seed grows into a and later becomes an adult plant.
Answer: seedlingA seedling is a young plant.
10. A butterfly that can lay eggs is an .
Answer: adultAdults can reproduce and start the cycle again.
Section C · Short answers 6 marks (2 each)
11. Why is it called a life CYCLE?
Model answer: The adult makes eggs or seeds, and these grow into new adults. The stages repeat.A cycle goes round and round. The end of one life leads to the start of the next.
12. Name one way a nymph is different from a caterpillar.
Model answer: A nymph looks like a small adult, but a caterpillar looks very different from an adult butterfly. (Also accept: a nymph has no pupa stage.)Some life cycles have a pupa stage and some do not.
13. Name one thing a plant needs to grow from a seed.
Model answer: Water (or air, or a suitable temperature).Seeds need water, air and a suitable temperature to germinate.
Shukr Learns · free practice for parents and children · original questions, not affiliated with any school or agency