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Primary 6 PSLE Science Life Cycles Quiz
Free P6 PSLE Science Life Cycles quiz, Ox AI version, with questions, answers, and PSLE-focused practice for Singapore students.
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Answers
Answer Key - Primary 6 PSLE Science Quiz: Life Cycles
Note: This key matches Version 1 of 5. Accept equivalent wording unless stated otherwise.
Answer 1.
Larva (caterpillar) → pupa (chrysalis) → adult butterfly. (2 marks: 1 for correct names, 1 for correct order)
Answer 2.
(D) Frog. The tadpole has no legs, has a long tail, and swims in water, so it looks completely different from the adult frog. (2 marks: 1 for choice, 1 for observation)
Answer 3.
The seed contained stored food in its seed leaves, which provided energy for germination. Light is only needed later, when the green leaves make food by photosynthesis. (2 marks)
Answer 4.
Order: embryo inside egg → chick → adult hen. Yes, the chick looks similar to the adult hen — it already has feathers, a beak and two legs. (2 marks: 1 for order, 1 for similarity statement)
Answer 5.
The stored food in the seed leaves was used up during germination. Once the green leaves appeared, the plant made its own food by photosynthesis, so the seed leaves were no longer needed and dropped off. (2 marks)
Answer 6.
- (a) Both begin life as eggs laid by the adult female. (1 mark)
- (b) The mosquito has a four-stage life cycle (egg, larva, pupa, adult); its young do not look like the adult. The grasshopper has a three-stage life cycle (egg, nymph, adult); the nymph looks like a small adult and there is no pupa stage. (2 marks)
Answer 7.
- Fruit P: Wind — the thin papery wings help it float and glide on air currents. (1 mark)
- Fruit Q: Animals — the sweet, fleshy, brightly coloured fruit is eaten, and the seeds pass out undamaged elsewhere. (1 mark)
- Fruit R: Water — the fibrous, waterproof husk allows it to float and be carried by sea currents. (1 mark)
Answer 8.
- (a) Working: 6 + 25 + 6 = 37 days. (1 mark: 1 for correct total; accept if working shown)
- (b) Each stage became shorter at 30 °C than at 20 °C, so the beetle developed faster overall. Conclusion: a warmer temperature speeds up the beetle's development. (2 marks: 1 for comparing stage lengths, 1 for conclusion)
Answer 9.
- (a) Water, oxygen (air), and warmth (suitable temperature). (1 mark)
- (b) Example: Water is needed to soften/swell the seed coat and activate the stored food so the seedling can grow. (Accept: oxygen for respiration to release energy; warmth so enzymes can work.) (2 marks)
Answer 10.
Any two of: gills are replaced by lungs; the tail shrinks/disappears; legs grow; the young frog is able to live on land as well as in water. (3 marks: 1 per change described clearly, plus 1 for quality of explanation)
Answer 11.
- (a) Set-ups A and B. (1 mark)
- (b) Both A and D germinated even though D was in the dark, so light is NOT needed for germination. (2 marks)
Answer 12.
- Insect X: complete metamorphosis — example: butterfly (or mosquito, housefly, beetle). (1½ marks)
- Insect Y: incomplete metamorphosis — example: grasshopper (or cockroach, dragonfly). (1½ marks)
Answer 13.
Any two of: less competition with the parent plant and sibling seedlings for sunlight, water, minerals and space; reduced overcrowding; lower chance of spreading disease or being eaten together by the same predator. (3 marks)
Answer 14.
Mosquitoes lay eggs in still water, and the larvae and pupae live and develop in water before emerging as adults. Covering the containers stops mosquitoes from laying eggs there, so the eggs cannot hatch and the cycle is broken. (3 marks)
Answer 15.
- (a) 25 °C. (1 mark)
- (b) At 45 °C the temperature was too high — the enzymes in the seed stopped working or the seed was killed, so germination could not occur. (2 marks)
Answer 16.
- (a) She should change the presence of light: place one set-up in the light and one in the dark. (1 mark)
- (b) Any two: same type and number of seeds; same amount of water; same temperature; same type/amount of cotton wool. (1 mark)
- (c) Whether the seeds germinate, or the number of seeds that germinate each day. (1 mark)
- (d) Light is not necessary for bean seeds to germinate. (1 mark)
Answer 17.
Animal A does not protect or feed its young, so most eggs and young are eaten or die before becoming adults. By laying thousands of eggs, it increases the chance that at least a few will survive to adulthood and reproduce. (4 marks: 1 for no parental care, 1 for high mortality, 1 for many eggs increasing survival chance, 1 for clear explanation)
Answer 18.
- (a) Similarities: both begin life as an egg laid by the mother; both grow through distinct stages until they reach the adult stage. (2 marks)
- (b) Differences: the chicken has a three-stage life cycle while the butterfly has four stages (with a pupa); the chick looks similar to the adult hen, whereas the caterpillar looks completely different from the adult butterfly. (2 marks)
Answer 19.
- (a) Animals. (1 mark)
- (b) The tiny hooks catch onto the fur, feathers or skin of passing animals (or onto clothing), and the fruit is carried a long distance before dropping off. (2 marks)
- (c) It avoids competing with the parent plant for sunlight, water and minerals (accept: avoids overcrowding). (1 mark)
Answer 20.
Example: A frog lays many eggs in water. Although adult frogs die, the eggs hatch into tadpoles that grow into new adult frogs, replacing those that died. Without reproduction, no new individuals would be produced and the species would die out. (4 marks: 1 for suitable example, 1 for stating organisms die, 1 for offspring replacing them, 1 for link to species continuing)
END OF ANSWER KEY