73.
Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of
A. hormones B. enzymes
C. proteins D. vitamins
Answer & Explanation
Answer: Option B
Explanation:
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74.
Mutation is
A. a factor responsible for plant growth
B. a change which affects the offspring of F2 generation only
C. a change that is inherited
D. a change which affects the parents
Answer & Explanation
Answer: Option C
Explanation:
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75.
Pollination by wind is called
A. anemophily B. hydrophily
C. zoophily D. entomophily
Answer & Explanation
Answer: Option A
Explanation:
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76.
Pollen grains in plants are produced in
A. roots B. leaves
C. flower D. stem
Answer & Explanation
Answer: Option C
Explanation:
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77.
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
A. By cyanobacteria
B. By electrical discharges in the atmosphere
C. By industrially synthesised fertilizer
D. By denitrification
Answer & Explanation
Answer: Option D
Explanation:
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78.
Ptyalin is an enzyme produced in the
A. salivary glands
B. pituitary glands
C. thyroid glands
D. pancreas
Answer & Explanation
Answer: Option A
Explanation:
No answer description available for this question
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