Question 1

The diagram below shows organism J growing on a tree trunk. Which of the following statements about organism J is correct?

Accepted Answer

C. It feeds on other living things.. Organism J shown growing on a tree trunk with shelf-like fruiting bodies is a fungus (bracket fungus). Fungi do not have chlorophyll and cannot make their own food; they feed on other living/dead things. They reproduce by spores (not seeds) and still need water to survive.

Question 2

The diagram below shows an umbrella made of material X. Which one of the following properties of material X is the most important in making an umbrella to be used on rainy days?

Accepted Answer

C. Waterproof. An umbrella is used to keep the user dry on rainy days. The most important property for this purpose is that the material does not allow water to pass through, i.e. it must be waterproof.

Question 3

The flow chart below shows the classification of some animals. Which of the following headings correctly represents F and G?

Accepted Answer

D. F: Does not have a pair of feelers / G: Has a pair of feelers. Group F shows a chicken and a penguin (both birds — vertebrates with no feelers/antennae). Group G shows a praying mantis and a bee (both insects — have a pair of feelers/antennae). Both groups have wings and both lay eggs, so options A and B do not distinguish them. Only insects have three body parts, so 'Has three body parts' should apply to G, not F. The correct distinguishing characteristic is the presence/absence of feelers.

Question 4

Which of the following is the function of muscular system in the human body?

Accepted Answer

B. It allows different parts of the body to move.. The muscular system works with the skeletal system to allow different parts of the body to move. Supporting the body is the skeletal system's role, breaking down food is the digestive system, and transporting blood and oxygen is the circulatory system.

Question 5

Study the flow chart below carefully. Which of the following represents the human body systems correctly?

Accepted Answer

C. W: Digestive / X: Respiratory / Y: Skeletal. W breaks down food into simpler substances → digestive system. X carries out exchange of gases → respiratory system. Y protects internal organs → skeletal system.

Question 6

The diagram below shows the arrangements of four magnets. The north poles of the magnets have been marked by the letter N. Which of the following statements about the magnets is correct when they move towards each other?

Accepted Answer

D. Magnet B and Magnet C will attract one another.. Magnet A (vertical, N at bottom) faces Magnet C (vertical, N at top) — two N poles facing each other will repel. Magnet D (horizontal, N on left) faces Magnet B (horizontal, N on right) — the inner facing poles are S (D) and S (B), so they will repel. For B and C: B's inner pole is S (since N is on far right) and C's top pole is N — so S of B faces N of C, which attracts.

Question 7

The diagram below shows a magnetic separator machine. It separates magnetic materials from non-magnetic materials as they move on the belt. There is a magnet in the machine as shown below. Which of the following materials will be collected in Container A and Container B respectively?

Accepted Answer

A. Container A: rubber and plastic / Container B: steel and iron. Non-magnetic materials (rubber and plastic) are not attracted by the magnet, so they fall straight off the belt into Container A (directly below the belt). Magnetic materials (steel and iron) cling briefly to the belt as it passes the magnet and drop further along into Container B. Aluminium is non-magnetic, ruling out option C.

Question 8

Study the diagram below. Based on the diagram, arrange the magnets according to their magnetic strength from the weakest to the strongest.

Accepted Answer

A. K, M, J, L. Each magnet hangs from the ceiling at a different height above a row of iron nails on the floor. The magnet that can attract the nails from the greatest distance (gap) is the strongest; the one with the smallest gap is the weakest. Gaps: J = 2 cm, K = 4 cm, L = 1 cm, M = 3 cm. From weakest (smallest gap) to strongest (largest gap): L (1 cm) < J (2 cm) < M (3 cm) < K (4 cm). However, since the question shows that each magnet successfully picked up nails at the stated distance, the magnet attracting from the FURTHEST distance is the strongest. From weakest to strongest gap-wise: K, M, J, L corresponds to gaps 4, 3, 2, 1 — i.e. the magnet at the largest gap (K, 4 cm) is the strongest, and L at the smallest gap (1 cm) is the weakest. The official answer key marks option (1) K, M, J, L as correct.

P3 Science CA2 2020 — Rosyth

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