Question 1

All the shapes are in ( solid / liquid / gas ) state.

Accepted Answer

A. solid. The task refers to 'shapes (square, triangle, circle)' which are physical, tangible objects. These objects exist in the solid state.

Question 2

The diagram shows a plant. Which of the following identifies the parts correctly?

Accepted Answer

C. leaf, root. The diagram labels part X as a leaf and part Y as the root of the plant. Option (C) correctly matches X to 'leaf' and Y to 'root'.

Question 3

Study the three human body systems. Which human body system(s) has/have the parts correctly matched to the system?

Accepted Answer

A. circulatory only. The circulatory system lists heart, blood vessels, and blood, all of which are correct components of that system. The respiratory system lists 'gullet', which is part of the digestive system, making its matching incorrect. While the listed parts for the digestive system (stomach, small intestine) are also correct components, the provided correct option (A) indicates that only the circulatory system is deemed 'correctly matched' among the choices offered, possibly implying a more specific interpretation of 'correctly matched' in this context where only one option is singularly true.

Question 4

When both holes are open, the water flows out ( faster than / slower than / as fast as ) when one of the holes is covered.

Accepted Answer

A. faster than. When both holes are open, air can enter through one hole to replace the volume of water flowing out through the other. This prevents a vacuum from forming inside the bottle, allowing atmospheric pressure to assist or at least not impede the water flow, making it faster. When one hole is covered, a partial vacuum forms above the water, creating resistance against the water flowing out, thus slowing the flow.

Question 5

The picture shows a disposable face mask. The mask serves to protect the wearer from breathing in viruses in the air. Which of the following human systems does the mask protect directly?

Accepted Answer

D. Respiratory system. A face mask protects against inhaling airborne viruses. Inhaling is a function of the respiratory system, which includes organs like the nose, windpipe, and lungs. Therefore, the mask directly protects the respiratory system.

Question 6

The picture shows a tree caught in a strong gust of wind. Which of the following explains why the tree remain in place?

Accepted Answer

D. The roots hold the tree firmly to the ground.. The primary function of a plant's roots is to anchor the plant firmly in the soil. This anchoring prevents the tree from being uprooted or blown over, especially during strong winds, allowing it to remain in place.

Question 7

Study the statements about the human digestive system. A No digestion of food takes place in the mouth. B The gullet joins the mouth to the stomach. C Digested food from the small intestine is passed to the large intestine. Which statements about the digestive system is NOT correct?

Accepted Answer

B. A and C only. Statement A is incorrect because carbohydrate digestion begins in the mouth with the enzyme salivary amylase. Statement B is correct as the gullet (esophagus) connects the mouth (pharynx) to the stomach. Statement C is incorrect because digested food is absorbed into the bloodstream from the small intestine; it is undigested food and water that pass from the small intestine to the large intestine. Therefore, statements A and C are NOT correct.

Question 8

How does the number of leaves affect the height of the plants?

Accepted Answer

C. The greater the number of leaves, the taller the plant grows.. Plant Q, which had normal leaves (a greater number of leaves), showed more growth in height (from approximately 18cm to 27cm) compared to Plant P, which had most leaves removed (growing from approximately 18cm to 22cm). This observation indicates that a greater number of leaves leads to greater plant growth and thus a taller plant.

Question 9

Alice observed that even with fewer leaves, plant P could still grow. What does her observation show about the function of leaves?

Accepted Answer

A. Make food for the plant. Leaves are the primary site for photosynthesis, the process by which plants make their own food. The fact that Plant P, even with fewer leaves, continued to grow indicates that the remaining leaves were still capable of performing photosynthesis and producing food for the plant's survival and growth, even if at a reduced rate.

Question 10

The diagram shows the digestive system in Andy's body. He passed out watery stools. What happened in part X that caused his stools to be watery?

Accepted Answer

D. Not much water was removed from the undigested food.. Part X in the diagram represents the large intestine. The main function of the large intestine is to absorb water from the undigested food (chyme), converting it into solid feces. If stools are watery, it indicates that the large intestine failed to remove sufficient water from the undigested material.

Question 11

Daniel wanted to find out if the amount of liquid X would affect how fast food could be digested. He set up an experiment as shown below. He used two set-ups P and Q, using different volume of liquid X. In both set-ups, the time taken for the biscuit to be completely digested is recorded. Which of the following statements about the experiment is true?

Accepted Answer

D. It is not a fair test because the exposed surface area of the biscuits is different.. For a fair test to investigate the effect of liquid X volume, only the volume of liquid X should be varied between the set-ups, with all other factors (like the type and form of the biscuit) kept constant. In this experiment, both the volume of liquid X (20 ml in P vs. 60 ml in Q) and the exposed surface area of the biscuit (whole in P vs. broken into four parts in Q) are different. The change in the biscuit's surface area is a confounding variable, meaning it's not a fair test because the effect of liquid X volume cannot be isolated.

P4 Science CA1 2025 — Methodist Girls

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