51. When fluoride concentration in H₂O exceeds about 1.5 mg/l. the disease that may be caused, is
Answer:
(B) Fluorosis
Explanation:
Exposure to excessively high concentrations of fluoride in water can lead to a condition called fluorosis, which affects teeth and bones.
52. Forest and wild life are
Answer:
(A) Renewable resource
Explanation:
Forests and wildlife are considered renewable resources because they can regenerate over time, though they require sustainable management.
53. Nitrogen constitutes about 78% of the atmosphere
Answer:
(C) By volume
Explanation:
The composition of gases in the atmosphere is typically measured by volume. Nitrogen makes up about 78% of the air by volume.
54. The Wildlife (Protection) Act was enacted in the year:
Answer:
(D) 1972
Explanation:
The Wildlife (Protection) Act was enacted by the Parliament of India in 1972 for the protection of plants and animal species.
55. The functions of Central Board are given under:
Answer:
(A) Section 16
Explanation:
The functions of the Central Pollution Control Board are detailed under Section 16 of both the Water Act of 1974 and the Air Act of 1981.
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