General Knowledge - Biology

Exercise :: Biology - Section 1

  • Biology - Section 1
73. 

Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of

A. hormones
B. enzymes
C. proteins
D. vitamins

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: Option C

Explanation:

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75. 

Pollination by wind is called

A. anemophily
B. hydrophily
C. zoophily
D. entomophily

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: 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: 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: Option A

Explanation:

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