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Question (1)

QN0036022

Which of the following is considered an essential requirement for maintaining life?

(A) Only visible movement
(B) Maintenance and repair of body structures
(C) Only growth
(D) Only reproduction

Correct Answer: B

Explanation:

Living structures continuously undergo wear and damage, so maintenance and repair are essential life processes.

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Question (2)

QN0036023

A student observes that a sleeping animal shows no visible movement. Which observation would still provide evidence that it is alive?

(A) It has a fixed shape
(B) It contains stored food
(C) Molecular and internal life processes continue
(D) It does not change its position

Correct Answer: C

Explanation:

Visible movement is not sufficient to define life. Internal molecular movements and maintenance processes continue even during sleep.

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Question (3)

QN0036024

Why do multicellular organisms require specialised transportation systems?

(A) All cells are directly exposed to the environment
(B) Diffusion becomes sufficient for all cells
(C) Many cells are away from the external environment
(D) Cells do not require oxygen

Correct Answer: C

Explanation:

Many cells in complex organisms are away from the external environment, so diffusion alone cannot meet their requirements.

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Question (4)

QN0036025

An organism obtains carbon dioxide and water and uses sunlight to synthesise carbohydrates. This organism is most likely

(A) a parasite
(B) a heterotroph
(C) an autotroph
(D) a saprophyte

Correct Answer: C

Explanation:

Autotrophs use simple inorganic substances such as carbon dioxide and water and an external energy source such as sunlight.

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Question (5)

QN0036026

A plant stores some carbohydrates instead of using them immediately. In which form are they mainly stored?

(A) Glycogen
(B) Starch
(C) Protein
(D) Fatty acids

Correct Answer: B

Explanation:

Unused carbohydrates in plants are stored as starch, which acts as an energy reserve.

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Question (6)

QN0036027

A plant is kept in darkness for three days and then exposed to sunlight for six hours. Why is the plant first kept in darkness?

(A) To increase chlorophyll
(B) To remove oxygen from the leaves
(C) To use up previously stored starch
(D) To close all stomata permanently

Correct Answer: C

Explanation:

Keeping the plant in darkness allows previously stored starch to be used up before testing newly formed starch.

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Question (7)

QN0036028

A variegated leaf is exposed to sunlight and later tested with iodine. Only the green regions turn blue-black. What does this demonstrate?

(A) Water is essential for photosynthesis
(B) Chlorophyll is essential for photosynthesis
(C) Oxygen is essential for photosynthesis
(D) Roots perform photosynthesis

Correct Answer: B

Explanation:

Green regions contain chlorophyll and show starch formation after exposure to sunlight.

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Question (8)

QN0036029

In an experiment, potassium hydroxide is placed near a plant under an airtight bell jar. The potassium hydroxide absorbs carbon dioxide. If the plant is exposed to sunlight, what is expected?

(A) More starch will form
(B) No starch will form because CO₂ is unavailable
(C) Oxygen will completely disappear
(D) Water absorption will stop

Correct Answer: B

Explanation:

Carbon dioxide is a raw material required for photosynthesis. Removing it prevents normal starch formation.

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Question (9)

QN0036030

Guard cells become swollen when water enters them. What happens to the stomatal pore?

(A) It opens
(B) It closes
(C) It disappears
(D) It becomes filled with starch

Correct Answer: A

Explanation:

Swollen guard cells cause the stomatal pore to open.

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Question (10)

QN0036031

A plant growing in soil deficient in nitrogen shows poor growth. Which explanation is most appropriate?

(A) Nitrogen is needed for synthesis of proteins and other compounds
(B) Nitrogen directly provides sunlight
(C) Nitrogen replaces chlorophyll
(D) Nitrogen is the main source of water

Correct Answer: A

Explanation:

Nitrogen is an essential element used in the synthesis of proteins and other compounds.

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Question (1)

Which of the following is considered an essential requirement for maintaining life?

Explanation:

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Question (2)

A student observes that a sleeping animal shows no visible movement. Which observation would still provide evidence that it is alive?

Explanation:

Link:

Question (3)

Why do multicellular organisms require specialised transportation systems?

Explanation:

Link:

Question (4)

An organism obtains carbon dioxide and water and uses sunlight to synthesise carbohydrates. This organism is most likely

Explanation:

Link:

Question (5)

A plant stores some carbohydrates instead of using them immediately. In which form are they mainly stored?

Explanation:

Link:

Question (6)

A plant is kept in darkness for three days and then exposed to sunlight for six hours. Why is the plant first kept in darkness?

Explanation:

Link:

Question (7)

A variegated leaf is exposed to sunlight and later tested with iodine. Only the green regions turn blue-black. What does this demonstrate?

Explanation:

Link:

Question (8)

In an experiment, potassium hydroxide is placed near a plant under an airtight bell jar. The potassium hydroxide absorbs carbon dioxide. If the plant is exposed to sunlight, what is expected?

Explanation:

Link:

Question (9)

Guard cells become swollen when water enters them. What happens to the stomatal pore?

Explanation:

Link:

Question (10)

A plant growing in soil deficient in nitrogen shows poor growth. Which explanation is most appropriate?

Explanation:

Link:

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