This P4 Science SA1 paper from Anglo Chinese (2023) contains 7 questions worth 15 marks. Use it as a study reference for Science topics typically tested at P4 level in Singapore schools.
Q1Open-ended2 marks🖼 Visual
Unscramble the letters to solve the riddles.
FELI CCLYE — I am a pattern that living things go through and I repeat myself continuously.
GORF — I lay my eggs in water. My eggs have jelly-like covering.
PHYMN — At this stage, I look like the adult but I am smaller and do not have wings.
LUTOMING — During this process, the young of some animals grow a new skin and shed their old skin.
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Write the answers to the cloze passage in the crossword puzzle below.
Cloze Passage:
An adult mosquito lays its eggs in (i)____ water. As it (ii)____, it sheds its skin several times and eats a lot. When it changes into a pupa, it also breathes through an air (iii)____ that pierces through the water surface. During this stage, it does not feed and it hardly (iv)____.
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Study the classification diagram.
(a) Complete the diagram by filling in the boxes for (i) and (ii).
(b) The life cycle of a mealworm beetle is most similar to the life cycle of a butterfly. Based on the diagram above, give two reasons why.
Reason 1:
Reason 2:
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The graph shows the number of weeks that a grasshopper stays at the different stages of its life cycle.
Answer part (a) based on the graph.
(a)(i) How many weeks does the grasshopper stay in its egg stage?
____ weeks
(ii) How many weeks does an egg take to become an adult?
____ weeks
(b) State a difference between the nymph and the adult grasshopper. (Do not compare size)
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The diagram shows the growth of a brinjal plant.
(a) Different parts of a plant start growing during different stages of its life cycle. Arrange parts W, X and Z of the plant in the order that they start growing.
☐ → ☐ → ☐ → Y
(b) How did the plant get food before part W developed?
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The life cycle of a plant is shown.
(a) Name the stages of its life cycle by filling in the boxes A, B and C.
(b) At which stages, A, B and/or C, is the plant able to make food? Explain why.
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May wanted to find out if seeds need light to germinate. She placed some seeds into two identical pots, A and B, and watered them daily. She placed pot A near an open window and pot B inside a dark cupboard. She observed the growth of the seeds over four days.
(a) State all the conditions necessary for the seeds to germinate.
(b) May's brother said that the seeds in Pot B will not germinate as they did not receive sunlight. Do you agree? Explain why.
(c) Tick (✓) the variable(s) which should be kept the same for May to test the aim of the experiment.
Variables: Type of seeds; Location of pots; Amount of water; Number of seeds
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