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Understanding Photosynthesis

Total questions: 15

Worksheet time: 8mins

Name
Class
Date
1.

What are the main stages of the Calvin cycle?

a)

Glycolysis, Krebs cycle, oxidative phosphorylation

b)

Light reaction, dark reaction, electron transport

c)

Carbon fixation, reduction, regeneration of RuBP

d)

Photosynthesis, respiration, fermentation

2.

How does chlorophyll contribute to photosynthesis?

a)

Chlorophyll is responsible for the absorption of nutrients from the soil.

b)

Chlorophyll acts as a catalyst in the breakdown of glucose during respiration.

c)

Chlorophyll releases energy that directly converts glucose into oxygen.

d)

Chlorophyll absorbs light energy, enabling the conversion of carbon dioxide and water into glucose and oxygen.

3.

List three factors that can affect the rate of photosynthesis.

a)

Soil quality

b)

Water availability

c)

Air pressure

d)

Light intensity, carbon dioxide concentration, temperature

4.

Write the overall equation for photosynthesis.

a)

6CO2 + 6H2O -> C6H12O6 + 6O2 + light energy

b)

6CO2 + 6H2O + light energy -> C6H12O6 + 6O2

c)

6O2 + C6H12O6 + light energy -> 6CO2 + 6H2O

d)

C6H12O6 + 6O2 + light energy -> 6CO2 + 6H2O

5.

What role do stomata play in the process of photosynthesis?

a)

Stomata store water for plant growth.

b)

Stomata absorb sunlight for photosynthesis.

c)

Stomata allow for the exchange of gases, enabling the intake of carbon dioxide and the release of oxygen during photosynthesis.

d)

Stomata produce chlorophyll for photosynthesis.

6.

Explain the significance of ATP and NADPH in the Calvin cycle.

a)

ATP is only used for protein synthesis.

b)

NADPH is a waste product of the Calvin cycle.

c)

ATP and NADPH are crucial for energy and reducing power in the Calvin cycle.

d)

ATP and NADPH are not involved in photosynthesis.

7.

What is the primary pigment involved in photosynthesis?

a)

Carotene

b)

Chlorophyll

c)

Xanthophyll

d)

Phycobilin

8.

How does light intensity affect the rate of photosynthesis?

a)

Photosynthesis occurs only in darkness regardless of light intensity.

b)

Increased light intensity generally increases the rate of photosynthesis up to a saturation point.

c)

Higher light intensity decreases the rate of photosynthesis.

d)

Light intensity has no effect on photosynthesis.

9.

Describe how temperature influences photosynthesis.

a)

Temperature influences photosynthesis by affecting enzyme activity and metabolic processes, increasing rates up to an optimal point before causing declines at extreme temperatures.

b)

Higher temperatures always enhance photosynthesis without limits.

c)

Photosynthesis only occurs at freezing temperatures.

d)

Temperature has no effect on photosynthesis.

10.

What is the function of RuBisCO in the Calvin cycle?

a)

RuBisCO acts as a catalyst for the breakdown of carbohydrates in the Calvin cycle.

b)

RuBisCO transports oxygen to the chloroplasts during photosynthesis.

c)

RuBisCO facilitates the fixation of carbon dioxide in the Calvin cycle.

d)

RuBisCO is responsible for the production of glucose in the Calvin cycle.

11.

How do water and carbon dioxide enter the plant for photosynthesis?

a)

Water enters through roots; carbon dioxide enters through stomata.

b)

Water enters through leaves; carbon dioxide enters through roots.

c)

Water and carbon dioxide both enter through the roots.

d)

Water enters through stomata; carbon dioxide enters through leaves.

12.

What is the relationship between photosynthesis and cellular respiration?

a)

Photosynthesis and cellular respiration are unrelated processes that do not affect each other.

b)

Cellular respiration produces glucose and oxygen, which are used in photosynthesis.

c)

Photosynthesis produces glucose and oxygen, which are used in cellular respiration to generate energy.

d)

Photosynthesis occurs only at night while cellular respiration happens during the day.

13.

How does the concentration of carbon dioxide affect photosynthesis?

a)

Photosynthesis is unaffected by carbon dioxide concentration.

b)

Higher concentrations of carbon dioxide increase the rate of photosynthesis, up to a saturation point.

c)

Increased carbon dioxide leads to a decrease in plant growth.

d)

Higher carbon dioxide levels decrease photosynthesis efficiency.

14.

What adaptations do plants have to optimize photosynthesis?

a)

Broad leaves, high chloroplast density, stomata for gas exchange, waxy cuticle, C4 and CAM pathways.

b)

Thick bark to prevent water loss

c)

Absence of stomata for gas exchange

d)

Narrow leaves with low chloroplast density

15.

Explain the importance of the light-dependent reactions in photosynthesis.

a)

The light-dependent reactions convert solar energy into ATP and NADPH, which are essential for the synthesis of glucose in photosynthesis.

b)

They produce oxygen as a waste product only.

c)

They directly synthesize glucose without any energy input.

d)

They are responsible for the absorption of carbon dioxide.