Which one of the following statements is NOT correct?
 
1. The amount of some toxic substances of industrial wastewater increases in the organisms at successive trophic levels. 
2. The micro-organisms involved in biodegradation of organic matter in a sewage-polluted water body consume aquatic organisms.
3. Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries.
4. Water hyacinth grows abundantly in eutrophic water bodies and lead to an imbalance in the ecosystem dynamics of the water body.
Subtopic:  Water Pollution |
 64%
From NCERT
NEET - 2023
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Which of the following statements is correct?
 
1. Algal Bloom decreases fish mortality.
2. Eutrophication refers to increase in domestic sewage and waste water in lakes.
3. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.
4. Presence of large amounts of nutrients in water restricts 'Algal Bloom'.
Subtopic:  Water Pollution |
 63%
From NCERT
NEET - 2023
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Nitrates and phosphates flowing from agricultural farms into water bodies are a significant cause of:
1.Eutrophication2.Humification
3.Mineralisation4.Stratification
Subtopic:  Water Pollution |
 73%
From NCERT
NEET - 2023
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What will happen if fresh water lake gets contaminated by the addition of polluted water with high BOD?
1. Amount of dissolved oxygen in the lake will decrease.
2. The lake will remain unaffected
3. Number of submerged aquatic plants in the lake will increase
4. Number of aquatic animals in the lake will increase.
Subtopic:  Water Pollution |
 84%
From NCERT
NEET - 2023
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Match List - I with List - II
List-I List-II
(A) Deforestation (I) Responsible for heating of Earth's surface and atmosphere
(B) Reforesation (II) Conversion of forested areas to non-forested areas
(C) Green-house effect (III) Natural ageing of lake by nutrient enrichment of its water
(D) Eutrophication (IV) Process of restoring a forest that once existed but was removed
Choose the correct answer from the options given below:
Options: (A) (B) (C) (D)
1. IV III II I
2. I II III IV
3. III I II IV
4. II IV I III
Subtopic:  Green House Effect & Global Warming | Resource Utilisation & Maintenance | Water Pollution |
 84%
From NCERT
NEET - 2023
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Select the correct statements regarding dissolved Oxygen and Biochemical Oxygen demand.
A: BOD is inversely related to dissolved oxygen
B: Low dissolved oxygen and high BOD lead to loss of aquatic life.
C: High BOD leads to high dissolved oxygen
D: Both BOD and dissolved oxygen are indicator of health of a water body
E: Both BOD and dissolved oxygen are affected by amount of organic matter in the water body.
Choose the most appropriate answer from the options given below:
1. (A), (B), (C), (E) only 2. (A), (B), (D), (E) only
3. (A), (B), (C), (D) only 4. (B), (C), (D), (E) only
Subtopic:  Water Pollution |
 75%
From NCERT
NEET - 2023
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Which biological process leads to a decrease in the fish-eating bird population near a water body containing toxicants from industrial drainage? 
1. Algal bloom 
2. Biochemical oxygen demand 
3. Accelerated Eutrophication 
4. Biomagnification 

Subtopic:  Water Pollution |
 70%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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A species that was introduced for ornamentation but has become a troublesome weed in India:

1. Parthenium hysterophorus

2. Eichhornia crassipes

3. Prosopis juliflora

4. Trapa Spinosa

Subtopic:  Water Pollution |
 83%
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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