Q. What is the primary role of nitrogen fixation in plants?
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A.
To convert atmospheric nitrogen into a usable form
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B.
To produce glucose during photosynthesis
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C.
To absorb sunlight for energy
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D.
To release oxygen into the atmosphere
Solution
Nitrogen fixation is the process by which atmospheric nitrogen is converted into ammonia, a form that plants can use for growth.
Correct Answer:
A
— To convert atmospheric nitrogen into a usable form
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Q. What is the process by which plants convert light energy into chemical energy?
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A.
Respiration
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B.
Photosynthesis
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C.
Transpiration
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D.
Fermentation
Solution
Photosynthesis is the process where plants convert light energy into chemical energy stored in glucose.
Correct Answer:
B
— Photosynthesis
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Q. What is the role of legumes in nitrogen fixation?
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A.
They absorb nitrogen from the soil
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B.
They host nitrogen-fixing bacteria
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C.
They produce more oxygen
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D.
They enhance photosynthesis
Solution
Legumes form symbiotic relationships with nitrogen-fixing bacteria, allowing them to utilize atmospheric nitrogen.
Correct Answer:
B
— They host nitrogen-fixing bacteria
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Q. What is the significance of the nitrogen cycle in ecosystems?
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A.
It helps in energy transfer
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B.
It recycles nutrients
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C.
It increases carbon dioxide levels
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D.
It reduces soil acidity
Solution
The nitrogen cycle is crucial for recycling nitrogen in various forms, making it available for plant use.
Correct Answer:
B
— It recycles nutrients
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Q. Which organism is primarily responsible for nitrogen fixation in the soil?
-
A.
Rhizobium bacteria
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B.
Mycorrhizal fungi
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C.
Cyanobacteria
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D.
Actinomycetes
Solution
Rhizobium bacteria form symbiotic relationships with leguminous plants and are key players in nitrogen fixation.
Correct Answer:
A
— Rhizobium bacteria
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Q. Which pigment is primarily involved in photosynthesis?
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A.
Chlorophyll
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B.
Carotene
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C.
Xanthophyll
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D.
Phycobilin
Solution
Chlorophyll is the primary pigment that captures light energy for photosynthesis.
Correct Answer:
A
— Chlorophyll
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Q. Which process occurs in the chloroplasts of plant cells?
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A.
Cellular respiration
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B.
Photosynthesis
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C.
Nitrogen fixation
-
D.
Fermentation
Solution
Photosynthesis occurs in the chloroplasts, where light energy is converted into chemical energy.
Correct Answer:
B
— Photosynthesis
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