Chemistry 9th Chap 11 : Topic 9 - Maryam Publications

Chemistry Chapter 11 : Topic 9

Photosynthesis

1 / 14

Which of the following statements best explains why photosynthesis is considered a chemical process rather than a physical change?

A) It involves absorption of water through roots.

B) It produces new substances such as glucose and oxygen from carbon dioxide and water.

C) It takes place only inside the leaves of plants.

D) It occurs only in the presence of sunlight during daytime.

2 / 14

In photosynthesis, chlorophyll mainly functions as a substance that:

A) Absorbs light energy required for the reaction.

B) Converts glucose into carbon dioxide.

C) Provides carbon atoms for sugar formation.

D) Releases oxygen directly from soil minerals.

3 / 14

Which combination of substances represents the raw materials directly consumed during photosynthesis?

A) Carbon dioxide and oxygen

B) Carbon dioxide and water

C) Water and glucose

D) Oxygen and glucose

4 / 14

A student places a healthy green plant in complete darkness for several days. Which process will be directly affected first?

A) Photosynthesis

B) Respiration

C) Transpiration

D) Absorption of minerals

5 / 14

Which statement correctly describes the role of sunlight in photosynthesis?

A) Sunlight provides energy needed to convert reactants into products.

B) Sunlight supplies carbon dioxide to plants.

C) Sunlight combines directly with glucose molecules.

D) Sunlight acts as a catalyst without providing energy.

6 / 14

Which of the following is the correct word equation for photosynthesis?

A) Water + Oxygen → Carbon dioxide + Glucose

B) Carbon dioxide + Water → Glucose + Oxygen

C) Glucose + Oxygen → Carbon dioxide + Water

D) Carbon dioxide + Oxygen → Glucose + Water

7 / 14

Why are green leaves more efficient in photosynthesis than non-green parts of plants?

A) Green leaves release more oxygen during respiration.

B) Green leaves contain more water.

C) Green leaves absorb minerals directly from air.

D) Green leaves contain chlorophyll that captures light energy.

8 / 14

Which observation provides the strongest evidence that oxygen is produced during photosynthesis?

A) Wilting of leaves during hot weather

B) Formation of bubbles around aquatic plants in sunlight

C) Absorption of water from soil

D) Increase in root length

9 / 14

If carbon dioxide is removed from the surroundings of a plant, the plant will be unable to:

A) Transport minerals upward

B) Carry out respiration

C) Absorb water through roots

D) Produce glucose by photosynthesis

10 / 14

Which substance formed during photosynthesis stores chemical energy in plants?

A) Water

B) Carbon dioxide

C) Oxygen

D) Glucose

11 / 14

A plant is kept in sunlight but its leaves are covered with black paper. Which result is most likely?

A) Covered areas will release more oxygen.

B) Photosynthesis will continue normally in covered areas.

C) Chlorophyll will become more active in darkness.

D) Covered areas will not produce glucose.

12 / 14

Which statement best explains why photosynthesis is important for living organisms?

A) It provides food and oxygen necessary for life.

B) It converts oxygen into minerals for plants.

C) It increases the amount of carbon dioxide in air.

D) It removes all nitrogen from the atmosphere.

13 / 14

Which condition is necessary for photosynthesis to occur?

A) Presence of high temperature only

B) Presence of oxygen only

C) Presence of nitrogen gas

D) Presence of chlorophyll

14 / 14

During photosynthesis, oxygen released by plants mainly originates from:

A) Minerals absorbed from soil

B) Water used in the reaction

C) Carbon dioxide absorbed from air

D) Glucose formed in leaves

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