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 occurs only in the presence of sunlight during daytime.

B) It involves absorption of water through roots.

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

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

2 / 14

In photosynthesis, chlorophyll mainly functions as a substance that:

A) Provides carbon atoms for sugar formation.

B) Releases oxygen directly from soil minerals.

C) Absorbs light energy required for the reaction.

D) Converts glucose into carbon dioxide.

3 / 14

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

A) Water and glucose

B) Carbon dioxide and water

C) Oxygen and glucose

D) Carbon dioxide and oxygen

4 / 14

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

A) Respiration

B) Absorption of minerals

C) Transpiration

D) Photosynthesis

5 / 14

Which statement correctly describes the role of sunlight in photosynthesis?

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

B) Sunlight combines directly with glucose molecules.

C) Sunlight acts as a catalyst without providing energy.

D) Sunlight supplies carbon dioxide to plants.

6 / 14

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

A) Glucose + Oxygen → Carbon dioxide + Water

B) Carbon dioxide + Oxygen → Glucose + Water

C) Water + Oxygen → Carbon dioxide + Glucose

D) Carbon dioxide + Water → Glucose + Oxygen

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 chlorophyll that captures light energy.

C) Green leaves contain more water.

D) Green leaves absorb minerals directly from air.

8 / 14

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

A) Formation of bubbles around aquatic plants in sunlight

B) Wilting of leaves during hot weather

C) Increase in root length

D) Absorption of water from soil

9 / 14

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

A) Absorb water through roots

B) Produce glucose by photosynthesis

C) Carry out respiration

D) Transport minerals upward

10 / 14

Which substance formed during photosynthesis stores chemical energy in plants?

A) Glucose

B) Carbon dioxide

C) Oxygen

D) Water

11 / 14

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

A) Photosynthesis will continue normally in covered areas.

B) Covered areas will release more oxygen.

C) Covered areas will not produce glucose.

D) Chlorophyll will become more active in darkness.

12 / 14

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

A) It converts oxygen into minerals for plants.

B) It removes all nitrogen from the atmosphere.

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

D) It provides food and oxygen necessary for life.

13 / 14

Which condition is necessary for photosynthesis to occur?

A) Presence of oxygen only

B) Presence of nitrogen gas

C) Presence of high temperature only

D) Presence of chlorophyll

14 / 14

During photosynthesis, oxygen released by plants mainly originates from:

A) Water used in the reaction

B) Carbon dioxide absorbed from air

C) Minerals absorbed from soil

D) Glucose formed in leaves

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