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Question (11)

QN0029883

A twig with white flowers was placed in red-coloured water. After one day, red colour appeared in flowers and leaves. Which structure transported the coloured water?

(A) Phloem
(B) Stomata
(C) Xylem
(D) Chloroplast

Correct Answer: C

Explanation:

Xylem transports water and minerals upward through the plant.

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Question (12)

QN0029884

Food prepared in leaves reaches roots and seeds through—

(A) Xylem
(B) Phloem
(C) Stomata
(D) Root hairs

Correct Answer: B

Explanation:

Phloem transports prepared food to all parts of the plant.

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Question (13)

QN0029885

In an experiment, germinating seeds were kept in a flask connected to lime water. The lime water turned milky because the seeds released—

(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Hydrogen

Correct Answer: C

Explanation:

Respiration in seeds releases carbon dioxide which turns lime water milky.

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Question (14)

QN0029886

Which process releases energy for growth and development in plants?

(A) Photosynthesis
(B) Respiration
(C) Transpiration
(D) Germination

Correct Answer: B

Explanation:

During respiration, glucose breaks down to release energy.

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Question (15)

QN0029887

A plant is provided with sunlight, water, and chlorophyll but not carbon dioxide. What will most likely happen?

(A) Photosynthesis will continue normally
(B) Oxygen production will stop
(C) Roots will stop growing immediately
(D) Xylem transport will stop completely

Correct Answer: B

Explanation:

Without carbon dioxide, photosynthesis cannot occur, so oxygen will not be produced.

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Question (16)

QN0029888

Which of the following correctly matches the plant structure with its function?

(A) Xylem — transports food
(B) Phloem — transports minerals only
(C) Stomata — gas exchange
(D) Roots — photosynthesis

Correct Answer: C

Explanation:

Stomata help in exchange of oxygen and carbon dioxide.

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Question (17)

QN0029889

A student observed that a plant kept in sunlight without water died faster than a plant kept in darkness with water. Which conclusion is most appropriate?

(A) Sunlight alone is sufficient for growth
(B) Water is essential for survival of plants
(C) Darkness increases photosynthesis
(D) Plants grow without minerals

Correct Answer: B

Explanation:

Even with sunlight, absence of water prevents survival and growth.

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Question (18)

QN0029890

During respiration in plants, glucose reacts with oxygen to form carbon dioxide, water, and—

(A) Minerals
(B) Chlorophyll
(C) Energy
(D) Starch

Correct Answer: C

Explanation:

Respiration releases energy required for plant activities.

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Question (19)

QN0029891

If all green plants suddenly disappeared from Earth, the immediate major effect would be—

(A) Increase in oxygen level
(B) No change in food chains
(C) Reduction in oxygen and food availability
(D) Increase in rainfall only

Correct Answer: C

Explanation:

Green plants are primary producers and major oxygen suppliers.

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Question (20)

QN0029892

A student compares two leaves after iodine testing. Leaf X turns blue-black completely, while Leaf Y shows no blue-black colour. Which condition was most likely true for Leaf Y?

(A) It received sunlight and water
(B) It contained chlorophyll
(C) It was kept in darkness before testing
(D) It had excess starch

Correct Answer: C

Explanation:

Without sunlight, photosynthesis does not occur, so starch is not formed.

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Question (11)

A twig with white flowers was placed in red-coloured water. After one day, red colour appeared in flowers and leaves. Which structure transported the coloured water?

Explanation:

Link:

Question (12)

Food prepared in leaves reaches roots and seeds through—

Explanation:

Link:

Question (13)

In an experiment, germinating seeds were kept in a flask connected to lime water. The lime water turned milky because the seeds released—

Explanation:

Link:

Question (14)

Which process releases energy for growth and development in plants?

Explanation:

Link:

Question (15)

A plant is provided with sunlight, water, and chlorophyll but not carbon dioxide. What will most likely happen?

Explanation:

Link:

Question (16)

Which of the following correctly matches the plant structure with its function?

Explanation:

Link:

Question (17)

A student observed that a plant kept in sunlight without water died faster than a plant kept in darkness with water. Which conclusion is most appropriate?

Explanation:

Link:

Question (18)

During respiration in plants, glucose reacts with oxygen to form carbon dioxide, water, and—

Explanation:

Link:

Question (19)

If all green plants suddenly disappeared from Earth, the immediate major effect would be—

Explanation:

Link:

Question (20)

A student compares two leaves after iodine testing. Leaf X turns blue-black completely, while Leaf Y shows no blue-black colour. Which condition was most likely true for Leaf Y?

Explanation:

Link:

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