Question

Which are not the indicators of water body degradation. i) increase transparency. ii) increase in biological oxygen demand. iii) increase in dissolve oxygen content in water body. iv) decrease in species diversity. v) increase in sedimentation. vi) decrease in dissolve oxygen content in water body. vii) increase in species diversity
1 point
A. ii, iv, and v
B. ii, v, and vi
C.I, iii and iv
D.I, iii and vii

Answer 1

Answer:

2,4 and 5

Explanation:

hope it helps.........

Answer 2

Answer: Option D : I, iii and vii

Explanation:

Water body degradation: It is a process of enrichment of water bodies with nutrients (phosphorous and nitrogen) leading to increased growth of flora (plants and algae) and fauna inside the water. These plants use dissolved oxygen of water, resulting in the deoxygenation of water.

Major indicators of water body degradation:

• Increase in biological oxygen demand - Indicates high level of pollution, since more amount of oxygen is required by the growing species that ultimately led to decrease the amount of oxygen from water.
• Decrease in species diversity - Due to poor water quality, animal population is decreasing.
• Increase in sedimentation - Indicates that water is filled with sediments and debris.
• Decrease in dissolved oxygen content in the water body - Indicates high biological oxygen demand (BOD).

Therefore, three of the following options are not acting as indicators of water body degradation. These are :

Option i) increase transparency.

Option iii) increase in dissolve oxygen content in water body.

Option vii) increase in species diversity.

There three parameters do not indicate water body degradation.

Correct answer is Option D. l, iii and vii

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