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Primary 5 Science Life Cycles Quiz
Free P5 Science Life Cycles quiz, LongCat Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Answers
Primary 5 Science Quiz - Life Cycles
Answer Key
Section A: Multiple Choice Questions (10 marks)
1. (b) Pollination → Fertilisation → Seed dispersal → Germination [1]
Reasoning: The correct sequence in the life cycle of a flowering plant begins with pollination, followed by fertilisation, then seed dispersal, and finally germination.
2. (b) Froglet [1]
Reasoning: The life cycle of a frog is: Egg → Tadpole → Froglet → Adult Frog. A froglet is a young frog that has developed legs but still has a tail.
3. (c) Ovary [1]
Reasoning: The ovary contains the ovules, which hold the female reproductive cells (eggs). The stamen (anther) contains the male reproductive cells (pollen).
4. (c) Butterfly [1]
Reasoning: A butterfly undergoes complete metamorphosis (egg → larva → pupa → adult). Grasshoppers, cockroaches, and dragonflies undergo incomplete metamorphosis (no pupa stage).
5. (c) Ovule [1]
Reasoning: The male reproductive cell (from pollen) travels down the pollen tube and fuses with the female reproductive cell inside the ovule.
6. (c) Chicken [1]
Reasoning: Chickens are birds and reproduce by laying eggs. Cats, dogs, and cows are mammals that give birth to live young.
7. (b) To protect the seed [1]
Reasoning: The seed coat is a protective outer covering that shields the embryo and food store from damage, drying out, and disease.
8. (d) Pollination [1]
Reasoning: Pollination is the transfer of pollen to the stigma — it is part of reproduction, not seed dispersal. Wind, water, and animals are all methods of seed dispersal.
9. (b) Wriggler [1]
Reasoning: The larva of a mosquito is commonly called a wriggler because of its wriggling movement in water. A nymph is the immature stage of insects with incomplete metamorphosis.
10. (c) The fertilised egg develops in the womb. [1]
Reasoning: Fertilisation occurs in the fallopian tube, and the fertilised egg then implants and develops in the womb (uterus). Eggs are produced in the ovaries.
Section B: Short Answer Questions (20 marks)
11.
(a) Pupa (or chrysalis) [1]
(b) Complete metamorphosis [1]
(c) Any one of the following: [1]
- Caterpillar has legs / Caterpillar crawls; Butterfly has wings / Butterfly can fly.
- Caterpillar eats leaves; Butterfly drinks nectar.
- Caterpillar does not have wings; Butterfly has wings.
12. [3 marks — 1 mark each]
| Part of Flower | Function |
|---|---|
| Stigma | Receives pollen / Sticky surface to trap pollen |
| Anther | Produces pollen grains (male reproductive cells) |
| Ovary | Contains ovules / Produces female reproductive cells (eggs) |
13. Any two of the following: [2]
- Water
- Warmth (suitable temperature)
- Air (oxygen)
Note: Light is NOT required for germination of most seeds (though some seeds do need light).
14.
(a) To provide food/nourishment for the growing embryo during germination [1]
(b) A new plant / young plant / seedling [1]
15. Any two of the following (or one well-explained point): [2]
- Seeds are spread away from the parent plant, reducing competition for water, sunlight, and minerals.
- It allows the plant species to colonise new areas.
- It increases the chances of survival of the species.
Marking note: Award 1 mark for each valid point, up to 2 marks.
16.
(a) Through gills [1]
(b) Through lungs and skin [1]
(c) Any one of the following: [1]
- Tadpole has a tail; Adult frog does not have a tail.
- Tadpole lives in water; Adult frog can live on land and in water.
- Tadpole does not have legs; Adult frog has legs.
17. Any two of the following: [2]
- Flowering plants produce seeds; Humans give birth to live young.
- Flowering plants undergo pollination; Humans do not.
- Flowering plants have a seed dispersal stage; Humans do not.
- Flowering plants produce many offspring (seeds); Humans usually produce one or few offspring at a time.
Marking note: Award 1 mark for each valid difference, up to 2 marks.
Section C: Structured / Explanation Questions (10 marks)
18.
(a) Pollination is the transfer of pollen grains from the anther to the stigma. [2]
Marking note: Award 1 mark for "transfer of pollen" and 1 mark for "from anther to stigma" (or equivalent).
(b) Fertilisation occurs when the male reproductive cell (from the pollen) fuses with the female reproductive cell (in the ovule). / The pollen tube grows down to the ovule and the male cell fuses with the female cell. [2]
Marking note: Award 1 mark for mentioning fusion of male and female cells, and 1 mark for correct location (ovule) or description of the process.
(c) Leaves (to carry out photosynthesis) / Sunlight / Chlorophyll [1]
Marking note: Accept any one valid answer. The young plant needs leaves to make its own food through photosynthesis.
19.
(a) Incomplete metamorphosis [1]
(b) Any two of the following: [2]
- Nymph does not have wings; Adult has wings.
- Nymph is smaller in size; Adult is larger.
- Nymph cannot reproduce; Adult can reproduce.
Marking note: Award 1 mark for each valid difference, up to 2 marks.
(c) It is called "incomplete" because there is no pupa stage in the life cycle. [1]
Marking note: Accept equivalent explanations, e.g., "the young resembles the adult" or "it has only three stages."
20.
(a) Pollination [1]
(b) Bees / Insects [1]
(c) Fertilisation would not occur / No seeds would be formed / No new plants would grow [1]
Marking note: Accept any valid consequence of no pollination.
End of Answer Key