P6 Science (PSLE) Practice Worksheet (online)

Section A - Multiple Choice

A1.Which statement about forces acting on an object is correct?[1]

A2.Which of the following best explains why oil spills at sea are harmful to the environment?[1]

A3.In a forest food chain, oak leaves -> caterpillar -> sparrow -> hawk, what role does the oak tree play?[1]

A4.A garden lizard in Singapore is often seen basking motionless in a sunny, open spot early in the morning. Since lizards cannot generate their own body heat internally, what is the main purpose of this behaviour?[1]

A5.A cactus growing in the desert has roots that spread out widely just below the soil surface, rather than growing straight down. What advantage does this root system give the plant after a sudden rain shower?[1]

A6.A community garden plot planted with beans is watered daily but placed in heavy shade under a large tree. The beans grow poorly. What is the most likely reason?[1]

A7.In a pond food web, algae is eaten by tadpoles and small fish; frogs eat both tadpoles and small fish; herons eat frogs and small fish. If a pollutant kills most of the small fish, what is the most likely effect on the ecosystem?[2]

A8.An astronaut on the Moon drops a hammer and a feather from the same height at the same time, and they land at exactly the same moment, unlike on Earth where the feather would drift down slowly. What is the best explanation, considering both gravity and friction?[2]

Section B - Short Answer

B1.Name the force that pulls all objects on Earth downwards towards the ground.[1]

B2.A ball is thrown straight up into the air. Explain how its energy changes as it rises to its highest point.[2]

B3.Two species of birds in the same forest both build nests in tree holes and eat the same type of insects. Explain what happens to both bird populations if tree holes and insects become scarce.[2]

B4.Explain how deforestation affects the animals living in a forest.[2]

B5.A toy car is pushed and rolls across a rough table until it stops on its own. A student says the car's energy has disappeared. Explain why this is incorrect, describing what actually happens to its kinetic energy.[2]

B6.A student says, 'The Sun is a producer because it gives plants the energy they need to grow.' Explain why this statement is incorrect.[2]

Section C - Structured

C1.A food web in a pond includes algae, tadpoles, small fish and a heron. Algae are eaten by tadpoles; tadpoles are eaten by small fish; small fish are eaten by the heron.[3]

(a)Identify the producer and ONE consumer in this food web.[2]

(b)State the source of energy for this whole food web.[1]

C2.In a grassland habitat, lions prey on zebras. One year, a disease causes the zebra population to fall sharply.[3]

(a)Explain what is likely to happen to the lion population soon after, and why.[2]

(b)State ONE other organism, besides lions, that is likely to be affected by the fall in the zebra population, and briefly explain why.[1]

C3.Some birds, such as swallows, migrate long distances to a warmer country when winter approaches, while some other animals, such as stick insects, have body shapes and colours that closely resemble twigs or leaves.[4]

(a)State whether migration is a structural or a behavioural adaptation. Explain your answer.[2]

(b)Explain how the stick insect's body shape and colour help it survive.[2]