Question 1

Which of the following reproduce(s) by spores?
A Penguin
B Mushroom
C Bird's nest fern
D Sunflower plant

Accepted Answer

C. B and C only. Mushroom (fungus) and bird's nest fern reproduce by spores. Penguin reproduces by eggs and sunflower plant by seeds, so only B and C are correct.

Question 2

Study the classification chart. [Classification chart: Animals split into 'have hair' (further split into 'have wings' = A and 'do not have wings' = B) and 'do not have hair' = C.] Three animals, X, Y and Z, are shown below. Which of the following shows the correct classification of the animals in groups A, B and C?

Accepted Answer

D. A=Z, B=X, C=Y. Bat (Z) has hair and wings → A. Wolf (X) has hair but no wings → B. Goldfish (Y) does not have hair → C.

Question 3

Which of the following statements is correct about germination of a seed?

Accepted Answer

D. Seeds need air, water and warmth to germinate.. Germination requires air, water and warmth (suitable temperature). Sunlight is not needed for germination. The root emerges first, not the shoot.

Question 4

Some characteristics of animals L and M are listed in the table as shown. Based on information, which of the following identifies animals L and M correctly?

Accepted Answer

A. L=Hen, M=Mosquito. Hen has 3 life-cycle stages (egg → chick → adult) and the chick resembles the adult. Mosquito spends its early life stages (egg, larva, pupa) in water.

Question 5

The diagrams below show some parts of the reproductive systems of a human and a plant respectively. Which of the following statements is correct?

Accepted Answer

B. Reproductive cells are stored at parts Q and Y.. Q (ovary in human) stores the egg cells and Y (anther of plant) stores the pollen grains — both contain reproductive cells. Pollination occurs at the stigma, fertilised egg develops in the uterus and ovule, and fusion occurs in the fallopian tube and ovule respectively.

Question 6

Study the seed dispersal pattern of plants P, Q and R as shown. Which of the following shows the methods of seed dispersal for plants P, Q and R?

Accepted Answer

A. Animals=P, Wind=Q, Splitting=R. P's seeds are scattered randomly regardless of wind direction → dispersed by animals. Q's seeds are scattered only in the wind direction → wind dispersal. R's seeds drop close to the parent → splitting/explosive action dispersal.

Question 7

The table shows three body systems. Which of the following organs are found in the respective body systems?

Accepted Answer

B. Digestive=Mouth, Respiratory=Lungs, Circulatory=Heart. The mouth is part of the digestive system, lungs are part of the respiratory system, and the heart is part of the circulatory system.

Question 8

Muthu wanted to find out if plants need leaves to make food. He prepared two set-ups. The diagram shows one of the set-ups, placed in the garden. Which of the following set-ups should Muthu use as his second set-up for his experiment?

Accepted Answer

C. Leaves removed, placed in the garden. To test if plants need leaves to make food, the only variable that should differ is the presence of leaves. All other conditions (sunlight, water, location in garden) must be kept constant. Removing the leaves and placing the plant in the garden is the correct comparison.

Question 9

The diagram shows a single-cellular organism which is able to make its own food. Which of the following parts are also found in an animal cell?

Accepted Answer

C. B, C and D only. An animal cell contains cytoplasm (B), cell membrane (C) and nucleus (D), but does NOT contain chloroplasts (A) because animals do not photosynthesise.

Question 10

In a forest, a student observed the movement of forest beetles. She placed twenty-five beetles in the middle of the forest floor where she marked out the four areas with different conditions. After fifteen minutes, she recorded the number of beetles found in each area. Based on the above information, which of the following factors determined the preferred condition for the forest beetles?

Accepted Answer

B. Amount of water. The beetles overwhelmingly preferred damp areas (damp soil, damp log, damp tree-trunk holes) and avoided dry ground. The common factor distinguishing preferred from non-preferred areas is the amount of water/moisture.

Question 11

The graph below shows the change in the number of organism X in a grassland habitat over six weeks. Organism X feeds on grass. [Graph: Line graph showing number of organism X rising from 30 in week 1 to peak of 60 in week 3, then declining to about 22 by week 6.] Based on the information, which of the following could have most likely caused the change in the population of organism X from week 3 onwards?

Accepted Answer

B. A population of animal eaters was introduced into the habitat.. The decline in population from week 3 onwards is best explained by the introduction of predators that prey on organism X, increasing the death rate.

Question 12

Which of the following represents a community?

Accepted Answer

D. Two birds, three spiders and several trees living in a forest. A community consists of populations of different species living together in the same area. Only option D describes multiple different species (birds, spiders and trees) living together.

Question 13

The diagram shows the organisms living together in a place. The food chain shows the feeding relationship among some organisms in the place: plant N → caterpillar → chicken. It was observed that plants N were rapidly being destroyed by the caterpillars. Chemical T was used to spray on the plants to get rid of the caterpillars for the next three months. Based on the above information, which of the following statements are most likely to be correct?
A The population of plant N would increase.
B The number of fruits of plant M would increase.
C The population of the chickens would decrease.

Accepted Answer

B. A and C only. With caterpillars killed: Plant N (their food source is no longer being eaten) increases (A correct). Chickens lose their food source so their population decreases (C correct). Plant M's fruits depend on pollination by butterflies (adult form of the caterpillars); fewer butterflies means fewer fruits, so B is incorrect.

Question 14

The diagram shows two different organisms, X and Y. Organism X is a brightly coloured insect that tastes very bitter and is avoided by predators. Organism Y has similar bright colours as X but does not taste bitter. Based on the information, which of the following best explains how looking like organism X helps organism Y in its survival?

Accepted Answer

A. Organism Y will have less predators.. By mimicking the appearance of bitter-tasting organism X, organism Y deceives predators into avoiding it, so it has fewer predators and a higher chance of survival.

Question 15

The amount of greenhouse gases released into the atmosphere increased over the years. Which of the following is least likely to be a reason for the increase in the amount of greenhouse gases?

Accepted Answer

D. Increase in the use of renewable sources of energy to generate electricity. Renewable energy sources (solar, wind, hydro) do not release greenhouse gases, unlike burning fossil fuels in cars, ships, and power plants.

Question 16

Betty set up an experiment in a dark room. After one hour, she recorded the volume of gas collected in the syringe as shown above. She repeated the experiment by using lamps that emit blue and green light, respectively. Based on her results, she concluded that red light is most effective for photosynthesis while green light is least effective. Which of the following most likely shows the result of her experiment?

Accepted Answer

B. Bar chart: Blue medium, Green shortest, Red tallest. Most photosynthesis under red light produces the most oxygen (tallest bar). Least photosynthesis under green light produces the least oxygen (shortest bar). Blue is in between.

Question 17

The diagram shows a pair of knee pads used to protect the knees during cycling. Part A of the knee pad protects the knee from being grazed by rough and hard surfaces while part B is worn around the knee to keep part A in place. Which of the following properties of materials should parts A and B have?

Accepted Answer

B. Part A=Strong, Part B=Flexible. Part A must be strong to protect the knee from rough and hard surfaces without breaking. Part B must be flexible to stretch and fit comfortably around the knee.

Question 18

The diagrams below show two ways tea can be served. Which property of liquid does the diagrams show?

Accepted Answer

D. It does not have a fixed shape.. Tea (a liquid) takes the shape of whichever container it is poured into (bag or cup). This shows that liquids do not have a fixed shape.

Question 19

The diagram shows a toilet bowl. Water fills the water tank to a fixed level after each flush. A bottle of marbles is placed in the water tank to help conserve water. Less water is needed to flush the toilet when the bottle is in the water tank because ____.
A water does not have a fixed shape.
B the bottle of marbles has a fixed shape.
C the bottle of marbles occupies space in the water tank.

Accepted Answer

B. C only. The bottle of marbles occupies space inside the tank, so less water is needed to fill the remaining space to the fixed level. Statement C alone correctly explains this.

Question 20

The table shows the melting and boiling points of two substances, A and B. Which of the following is the most suitable temperature for both substances A and B to be stored as liquids?

Accepted Answer

B. 110°C. For both to be liquids, the temperature must be above both melting points (>100°C) and below both boiling points (<123°C). Only 110°C lies in this range.

Question 21

Three circuits are set up using identical bulbs and batteries as shown below. Which of the following shows the correct arrangement of bulbs, P, Q and R, in order of brightness, starting with the dimmest bulb?

Accepted Answer

C. Dimmest R → P → Q Brightest. Bulbs in series (R) share the battery's voltage so each is dimmest. Bulbs in parallel (Q) each receive full voltage so they are brightest. The mixed circuit (P) falls in between.

Question 22

A bulb, a battery and objects P, Q and R were used in the two circuits below. The three objects were made of different materials. Which of the following correctly identifies the materials of objects P, Q and R?

Accepted Answer

C. P=Aluminium, Q=Nickel, R=Glass. Since the first circuit lights up, both P and Q must be conductors (metals like aluminium and nickel). Since the second circuit (with R replacing P) does not light, R must be an insulator (glass).

Question 23

The diagram below shows three rings X, Y and Z arranged on a pole. One of the rings is copper and the other two rings are magnets. Based on the information, which of the following statement(s) is/are correct?
A X and Y are attracted to each other.
B X is made of non-magnetic material.
C Like poles of Y and Z are facing each other.

Accepted Answer

D. B and C only. Y floats above Z, showing like poles of Y and Z are facing each other and repelling (C correct). X simply rests on Y without floating, so X is the non-magnetic copper ring (B correct). A is incorrect — X is not magnetic so it is not attracted to Y.

Question 24

A string was passed through a straw. A balloon was then taped to the straw as shown below. When the rubber band was removed, the balloon and the straw moved together in the direction as shown in the diagram. Which of the following correctly explains this observation?

Accepted Answer

D. The force of the air rushing out of the balloon was greater than the frictional force between the straw and string.. When the rubber band is removed, air rushes out of the balloon and pushes the balloon (and attached straw) in the opposite direction. The straw moves along the string only because the force pushing it forward is larger than the frictional force between the straw and the string.

Question 25

A boy released a ball from his hands and kicked the ball up into the air as shown in the diagram below. Which of the following shows the amount of gravitational force acting on the ball as the ball moves from points A to D?

Accepted Answer

D. Gravitational force vs Time graph remains constant (horizontal line). Gravitational force depends on the mass of the object and the gravitational field strength. Since the ball's mass does not change, the gravitational force acting on it remains constant throughout its motion from A to D.

Question 26

The diagrams show three objects of identical height and width. They are of different shapes and made of different materials. The three objects were glued together and placed between a torch and a screen as shown. Which of the following shows the correct shadow on the screen?

Accepted Answer

A. Shadow with square top + star bottom shape. Wood and cardboard are opaque so they cast a shadow. Clear glass and clear plastic are transparent so light passes through and they cast no shadow. The resulting shadow shows only the wood (top half of square) and cardboard star.

Question 27

Amanda poured equal amount of hot tea into cups A and B, that were made of the same material. Which of the following best explains why Amanda could hold cup A for a longer time without her hands feeling hot?

Accepted Answer

C. The distance of her hand from the hot tea is greater in cup A.. Both cups are made of the same material, so they conduct heat equally well. Holding cup A by the handle places the hand farther from the hot tea, so less heat is transferred to the hand.

Question 28

The diagrams show a man holding a bow and arrow, just before and after releasing the arrow respectively. Based on the information, which of the following graphs shows the relationship between the length of his pull and the elastic potential energy possessed by the string just before he released the arrow?

Accepted Answer

A. Elastic potential energy vs length of pull — increasing linear line through origin. The greater the length the string is pulled, the more elastic potential energy is stored in the string. The relationship is therefore an increasing line starting from the origin.

P6 Science SA2 2025 — Raffles Girls

Related papers