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Primary 5 Science Life Cycles Quiz
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Questions
Primary 5 Science Quiz - Life Cycles
Name: ________________________________
Class: ________________________________
Date: ________________________________
Score: ______ / 30
Duration: 35 minutes
Total Marks: 30
Instructions:
- Answer all questions.
- Write your answers in the spaces provided.
- Marks for each question are shown in brackets [ ].
- You are advised to spend about 35 minutes on this paper.
- The use of calculators is not required.
Section A: Multiple Choice Questions (10 marks)
Questions 1–10 carry 1 mark each. Choose the most accurate answer for each question.
1. Which part of a flower produces pollen grains?
(A) Stigma
(B) Ovary
(C) Anther
(D) Style
Answer: ________ [1]
2. What is the first stage in the life cycle of a flowering plant after seed dispersal?
(A) Pollination
(B) Fertilisation
(C) Germination
(D) Flowering
Answer: ________ [1]
3. In the life cycle of a butterfly, which stage comes after the caterpillar (larva) stage?
(A) Egg
(B) Adult
(C) Pupa
(D) Nymph
Answer: ________ [1]
4. Which of the following is the male reproductive cell in humans?
(A) Egg
(B) Ovary
(C) Sperm
(D) Womb
Answer: ________ [1]
5. Where does fertilisation normally take place in a human female?
(A) Ovary
(B) Uterus (womb)
(C) Fallopian tube
(D) Vagina
Answer: ________ [1]
6. Which of the following is not a condition needed for seed germination?
(A) Water
(B) Warmth
(C) Sunlight
(D) Air (oxygen)
Answer: ________ [1]
7. In the life cycle of a frog, what is the name of the stage that hatches from the egg?
(A) Froglet
(B) Adult frog
(C) Tadpole
(D) Pupa
Answer: ________ [1]
8. Which process involves the transfer of pollen grains from the anther to the stigma of a flower?
(A) Fertilisation
(B) Germination
(C) Seed dispersal
(D) Pollination
Answer: ________ [1]
9. Which of the following animals undergoes incomplete metamorphosis?
(A) Butterfly
(B) Mosquito
(C) Grasshopper
(D) Beetle
Answer: ________ [1]
10. What do living things do through reproduction?
(A) Grow bigger
(B) Produce food
(C) Ensure the continuity of their kind
(D) Remove waste products
Answer: ________ [1]
Section B: Short Answer Questions (12 marks)
Questions 11–16 carry 2 marks each. Write your answers in the spaces provided.
11. The diagram below shows the life cycle of a flowering plant. The stages are labelled A, B, C and D.
(Imagine a cycle diagram:)
A → Seed → B → Young plant → C → Adult plant with flowers → D → Seeds produced → A
(a) Name stage B.
____________________________________________________________ [1]
(b) Name stage D.
____________________________________________________________ [1]
12. State two differences between the life cycle of a butterfly and the life cycle of a frog.
Difference 1: ____________________________________________________________
Difference 2: ____________________________________________________________ [2]
13. Explain why seed dispersal is important for flowering plants.
____________________________________________________________ [2]
14. The following stages in the life cycle of a chicken are shown below.
Egg → ? → Adult chicken
(a) Name the missing stage.
____________________________________________________________ [1]
(b) Does a chicken undergo complete or incomplete metamorphosis?
____________________________________________________________ [1]
15. Complete the table below about human reproduction.
| Structure | Function |
|---|---|
| Testes | ________________________________ [1] |
| ________________________________ | Where the fertilised egg develops into a baby [1] |
16. Give two conditions necessary for seeds to germinate. For each condition, briefly explain why it is needed.
Condition 1: ____________________________________________________________
Reason: ____________________________________________________________
Condition 2: ____________________________________________________________
Reason: ____________________________________________________________ [2]
Section C: Structured / Application Questions (8 marks)
Questions 17–20 carry 2–3 marks each. Answer all questions.
17. (3 marks)
A farmer noticed that all the bean plants growing in one corner of his field were very similar in height and colour. He also noticed that these plants grew very close together.
(a) Explain why the plants were very similar in appearance.
____________________________________________________________ [1]
(b) Explain why the plants grew very close together.
____________________________________________________________ [1]
(c) Suggest one disadvantage of having all the plants growing so close together.
____________________________________________________________ [1]
18. (2 marks)
The diagram shows a simple flower with some parts labelled.
(Imagine a flower diagram with labels pointing to: Petal, Sepal, Anther, Stigma, Ovary, Style)
(a) Which letter points to the part where pollen grains are produced?
____________________________________________________________ [1]
(b) Which letter points to the part where seeds are formed?
____________________________________________________________ [1]
19. (2 marks)
A student placed four identical bean seeds on wet cotton wool in four different set-ups:
| Set-up | Conditions |
|---|---|
| P | Room temperature, water, air present |
| Q | Room temperature, no water, air present |
| R | Room temperature, water, air present, placed in a dark cupboard |
| S | In a freezer, water, air present |
(a) In which set-up(s) would the seeds most likely germinate?
____________________________________________________________ [1]
(b) Explain why the seeds in set-up S would not germinate.
____________________________________________________________ [1]
20. (3 marks)
Study the life cycle of a mosquito below:
Egg → Larva → Pupa → Adult mosquito
(a) How many stages are there in the life cycle of a mosquito?
____________________________________________________________ [1]
(b) Does the mosquito undergo complete or incomplete metamorphosis? Explain your answer.
____________________________________________________________ [1]
(c) Give one reason why it is useful to know about the life cycle of the mosquito.
____________________________________________________________ [1]
End of Paper
Answers
Primary 5 Science Quiz - Life Cycles
Answer Key
Section A: Multiple Choice Questions
1. (C) Anther [1]
The anther is the part of the stamen that produces pollen grains. The stigma receives pollen; the ovary contains ovules; the style connects stigma to ovary.
2. (C) Germination [1]
After seed dispersal, the seed lands in a suitable environment and germinates. Pollination and fertilisation occur before seed formation in the adult plant.
3. (C) Pupa [1]
The butterfly life cycle is: Egg → Larva (caterpillar) → Pupa (chrysalis) → Adult. The pupa stage follows the caterpillar stage.
4. (C) Sperm [1]
Sperm is the male reproductive cell produced in the testes. The egg is the female reproductive cell produced in the ovaries.
5. (C) Fallopian tube [1]
Fertilisation occurs when a sperm fuses with an egg in the fallopian tube. The fertilised egg then travels to the uterus to develop.
6. (C) Sunlight [1]
Seed germination requires water, oxygen (air), and a suitable temperature (warmth). Sunlight is not required for germination — it is needed later for photosynthesis once the seedling grows leaves.
7. (C) Tadpole [1]
The frog life cycle is: Egg → Tadpole → Froglet → Adult frog. The tadpole hatches from the egg.
8. (D) Pollination [1]
Pollination is the transfer of pollen from the anther to the stigma. Fertilisation is the fusion of the male and female reproductive cells.
9. (C) Grasshopper [1]
Grasshoppers undergo incomplete metamorphosis (egg → nymph → adult). Butterflies, mosquitoes and beetles undergo complete metamorphosis with four distinct stages.
10. (C) Ensure the continuity of their kind [1]
Reproduction ensures that living things produce offspring so that their species continues to exist.
Section B: Short Answer Questions
11.
(a) Germination [1]
(b) Seed dispersal [1]
The cycle is: Seed → Germination → Young plant → Adult plant with flowers → Seed dispersal → Seed.
12. Any two of the following differences [1 each, total 2]:
- A butterfly has 4 stages in its life cycle (egg, larva, pupa, adult) while a frog has 3 main stages (egg, tadpole, adult frog — some may count froglet as a 4th).
- A butterfly undergoes complete metamorphosis (has a pupal stage) while a frog does not have a pupal stage.
- A butterfly develops on land/in air while a frog's early stages (egg and tadpole) develop in water.
- A butterfly has a larva (caterpillar) stage while a frog has a tadpole stage.
- A butterfly has a pupa/chrysalis stage; a frog does not.
13. Any 2 valid points [1 each, total 2]:
- Seed dispersal ensures seeds are spread away from the parent plant, reducing competition for sunlight, water, and nutrients.
- It helps the species colonise new areas / spread to new locations.
- It reduces the risk of all seeds being eaten or destroyed in one place.
- It prevents overcrowding around the parent plant.
14.
(a) Chick (or chick/hatchling) [1]
(b) Incomplete metamorphosis [1]
Chickens do not have a pupal stage. The young chick resembles a small adult and grows gradually.
15.
| Structure | Function |
|---|---|
| Testes | Produce sperm (male reproductive cells) [1] |
| Uterus / Womb [1] | Where the fertilised egg develops into a baby |
16. Any 2 of the following, with a valid reason [1 mark each for condition + reason, total 2]:
- Water — needed to soften the seed coat and activate enzymes inside the seed to begin growth.
- Air / Oxygen — needed for respiration so the seed can release energy for growth.
- Warmth / Suitable temperature — needed for enzymes to work properly; too cold and the enzymes are inactive.
Note: Sunlight is not a condition for germination. Award 0 if a student lists sunlight without qualification.
Section C: Structured / Application Questions
17.
(a) The plants were very similar because they grew from seeds produced by the same parent plant (or through self-pollination / asexual reproduction), so they inherited similar characteristics. [1]
(b) The plants grew very close together because the seeds were not dispersed far from the parent plant — they fell near the parent and germinated in the same area. [1]
(c) Any one valid disadvantage [1]:
- The plants compete for sunlight, water, and nutrients from the soil, so some may not grow well.
- Diseases or pests can spread easily from one plant to another because they are close together.
- There is not enough space for all plants to grow to their full size.
18.
(a) Anther [1]
(b) Ovary [1]
Pollen is produced in the anther (part of the stamen). After fertilisation, the ovules inside the ovary develop into seeds.
19.
(a) Set-ups P and R [1]
Both have water, air, and a suitable (room) temperature. Seeds in R will germinate even in the dark because sunlight is not needed for germination.
(b) The temperature in the freezer is too low / too cold [1]. Enzymes in the seed cannot work properly at such low temperatures, so germination cannot occur.
20.
(a) 4 stages [1]
(b) Complete metamorphosis [1]
Explanation: The mosquito has four distinct stages (egg, larva, pupa, adult), and it has a pupal stage where the body structure changes completely. This is the definition of complete metamorphosis.
(c) Any one valid reason [1]:
- Knowing the life cycle helps us control mosquito populations by targeting specific stages (e.g., removing stagnant water to prevent eggs/larvae from surviving).
- It helps us understand how diseases spread and how to prevent mosquito-borne illnesses.
- It helps scientists develop better methods to reduce mosquito breeding.
Total: 30 marks
Marking Notes:
- Accept equivalent scientific phrasing where the meaning is correct.
- For Q12 and Q13, award marks for any valid points within the scope of the P5 syllabus.
- For Q16, do not award a mark for "sunlight" as a germination condition — this is a common misconception at P5 level.
- For Q19(a), accept "P only" as partially correct (award 0) — the student must recognise that seeds can germinate in the dark.