Photosynthesis in Higher Plants
Q. What are the two main stages of photosynthesis?
-
A.
Light reactions and Calvin cycle
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B.
Respiration and Fermentation
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C.
Transpiration and Absorption
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D.
Glycolysis and Krebs cycle
Solution
Photosynthesis consists of light reactions and the Calvin cycle.
Correct Answer: A — Light reactions and Calvin cycle
Q. What gas is produced as a byproduct of photosynthesis?
-
A.
Oxygen
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B.
Carbon dioxide
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C.
Nitrogen
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D.
Hydrogen
Solution
Oxygen is produced as a byproduct of photosynthesis during the light reactions.
Correct Answer: A — Oxygen
Q. What is the effect of increased carbon dioxide concentration on photosynthesis?
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A.
Decreases rate
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B.
Increases rate
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C.
No effect
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D.
Stops photosynthesis
Solution
Increased carbon dioxide concentration generally increases the rate of photosynthesis, up to a certain point.
Correct Answer: B — Increases rate
Q. What is the effect of light intensity on the rate of photosynthesis?
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A.
Increases then decreases
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B.
Decreases
-
C.
Increases
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D.
No effect
Solution
The rate of photosynthesis generally increases with light intensity up to a certain point.
Correct Answer: C — Increases
Q. What is the main byproduct of photosynthesis?
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A.
Oxygen
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B.
Carbon dioxide
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C.
Glucose
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D.
Water
Solution
Oxygen is released as a byproduct of photosynthesis during the light reactions.
Correct Answer: A — Oxygen
Q. What is the main purpose of photosynthesis?
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A.
To produce oxygen
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B.
To convert solar energy into chemical energy
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C.
To absorb nutrients
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D.
To release carbon dioxide
Solution
The main purpose of photosynthesis is to convert solar energy into chemical energy in the form of glucose.
Correct Answer: B — To convert solar energy into chemical energy
Q. What is the main purpose of the Calvin cycle?
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A.
To absorb light
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B.
To produce ATP
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C.
To fix carbon dioxide
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D.
To release oxygen
Solution
The Calvin cycle's main purpose is to fix carbon dioxide into organic molecules.
Correct Answer: C — To fix carbon dioxide
Q. What is the primary pigment involved in photosynthesis in higher plants?
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A.
Chlorophyll a
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B.
Carotenoids
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C.
Xanthophylls
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D.
Chlorophyll b
Solution
Chlorophyll a is the main pigment that absorbs light energy for photosynthesis.
Correct Answer: A — Chlorophyll a
Q. What is the primary purpose of the Calvin cycle?
-
A.
To capture light energy
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B.
To produce ATP
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C.
To fix carbon dioxide
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D.
To release oxygen
Solution
The Calvin cycle's primary purpose is to fix carbon dioxide into organic molecules.
Correct Answer: C — To fix carbon dioxide
Q. What is the role of water in photosynthesis?
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A.
Source of carbon
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B.
Electron donor
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C.
Energy source
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D.
Nutrient supplier
Solution
Water acts as an electron donor in the light reactions of photosynthesis.
Correct Answer: B — Electron donor
Q. What is the significance of the light-dependent reactions?
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A.
Produce glucose
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B.
Generate ATP and NADPH
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C.
Fix carbon dioxide
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D.
Release oxygen
Solution
The light-dependent reactions generate ATP and NADPH, which are used in the Calvin cycle.
Correct Answer: B — Generate ATP and NADPH
Q. Where in the chloroplast does the Calvin cycle take place?
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A.
Thylakoid membrane
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B.
Stroma
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C.
Outer membrane
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D.
Inner membrane
Solution
The Calvin cycle occurs in the stroma of the chloroplast.
Correct Answer: B — Stroma
Q. Which gas is consumed during the process of photosynthesis?
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A.
Oxygen
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B.
Nitrogen
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C.
Carbon dioxide
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D.
Hydrogen
Solution
Carbon dioxide is taken in by plants during photosynthesis to produce glucose.
Correct Answer: C — Carbon dioxide
Q. Which gas is taken in by plants during photosynthesis?
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A.
Oxygen
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B.
Nitrogen
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C.
Carbon dioxide
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D.
Hydrogen
Solution
Plants take in carbon dioxide from the atmosphere during photosynthesis.
Correct Answer: C — Carbon dioxide
Q. Which of the following factors does NOT affect the rate of photosynthesis?
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A.
Light intensity
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B.
Temperature
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C.
Soil pH
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D.
Carbon dioxide concentration
Solution
Soil pH does not directly affect the rate of photosynthesis, unlike the other factors.
Correct Answer: C — Soil pH
Q. Which of the following is a product of the Calvin cycle?
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A.
ATP
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B.
NADPH
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C.
Glucose
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D.
Oxygen
Solution
The Calvin cycle produces glucose as a product of carbon fixation.
Correct Answer: C — Glucose
Q. Which of the following is NOT a stage of photosynthesis?
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A.
Light-dependent reactions
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B.
Calvin cycle
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C.
Krebs cycle
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D.
Light-independent reactions
Solution
The Krebs cycle is part of cellular respiration, not photosynthesis.
Correct Answer: C — Krebs cycle
Q. Which part of the chloroplast contains the thylakoid membranes?
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A.
Stroma
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B.
Outer membrane
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C.
Inner membrane
-
D.
Granum
Solution
The granum is a stack of thylakoids where the light-dependent reactions occur.
Correct Answer: D — Granum
Q. Which process converts light energy into chemical energy in plants?
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A.
Respiration
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B.
Transpiration
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C.
Photosynthesis
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D.
Fermentation
Solution
Photosynthesis converts light energy into chemical energy stored in glucose.
Correct Answer: C — Photosynthesis
Q. Which structure in plant cells contains chlorophyll?
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A.
Mitochondria
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B.
Chloroplasts
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C.
Nucleus
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D.
Ribosomes
Solution
Chloroplasts are the organelles that contain chlorophyll and are the site of photosynthesis.
Correct Answer: B — Chloroplasts
Q. Which type of plant is most efficient at photosynthesis in hot, dry environments?
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A.
C3 plants
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B.
C4 plants
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C.
CAM plants
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D.
All of the above
Solution
CAM plants are adapted to conserve water and are efficient in hot, dry environments.
Correct Answer: C — CAM plants
Q. Which type of plant is most efficient at photosynthesis under low light conditions?
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A.
C3 plants
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B.
C4 plants
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C.
CAM plants
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D.
Hydrophytes
Solution
CAM plants are adapted to photosynthesize efficiently in low light and arid conditions.
Correct Answer: C — CAM plants
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