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Primary 6 PSLE Science Systems Quiz
Free P6 PSLE Science Systems quiz, Ox Exam version, with questions, answers, and PSLE-focused practice for Singapore students.
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Answers
Primary 6 PSLE Science Quiz – Systems: Answer Key
Section A
Answer 1.
(B) It transports water from the roots to the leaves.
Answer 2.
(C) Small intestine
Answer 3.
(A) Cell wall and chloroplasts
Answer 4.
(A) The diaphragm moves down and the lungs expand.
Answer 5.
(B) Water is transported up the stem through tubes inside the stem.
Answer 6.
(D) Digestive system
Answer 7.
(C) In the air sacs of the lungs
Answer 8.
(B) Heart
Answer 9.
(D) Gullet
Answer 10.
(C) It increases so his body can take in more oxygen.
Section B
Answer 11.
C – Stomach; D – Small intestine.
Answer 12.
A plant cell has a cell wall and chloroplasts, but an animal cell does not. (Accept any two valid differences.)
Answer 13.
Root hairs increase the surface area of the roots so the plant can absorb more water and mineral salts from the soil.
Answer 14.
Both systems are made up of tubes that transport substances (such as water, nutrients and oxygen) to different parts of the organism.
Answer 15.
The red-coloured water was absorbed by the roots and transported up through the tubes in the stem to the flowers, so the flowers turned red. This shows that water travels upwards in the plant through tubes.
Answer 16.
Blood transports oxygen and digested food to all parts of the body and carries carbon dioxide and other waste away. It also helps protect the body against diseases. (Any two.)
Section C
Answer 17.
(a) Beaker P (warm room). (b) In the warm room, water evaporates from the leaves faster, so water is pulled up the tubes in the stalk faster. In the refrigerator, the low temperature slows evaporation, so the red water rises more slowly. Hence the red colour rose higher in Beaker P.
Answer 18.
(a) X – Diaphragm. (b) When breathing out, the diaphragm relaxes and arches upwards (moves up), while the ribs move downwards and inwards. The chest cavity becomes smaller, so air is forced out of the lungs.
Answer 19.
(a) Similarity: Both systems use tubes/vessels to transport substances around the organism. (b) Differences: The human circulatory system has a pump (the heart) to move the blood, but the plant transport system has no pump. The plant transport system carries water and mineral salts upwards from the roots and food from the leaves to other parts, while human blood carries oxygen, digested food, carbon dioxide and wastes to and from all body cells.
Answer 20.
(a) Harmful chemicals in cigarette smoke damage the air sacs and irritate the windpipe and lungs, making gaseous exchange less efficient and causing breathing difficulties. (b) Example: Eating too much oily/fatty food. Fats can build up and narrow the blood vessels, making it harder for the heart to pump blood. (Accept other valid examples such as smoking or lack of exercise.) (c) Exercise regularly (or eat a balanced diet, do not smoke).