NEET Biology Environmental Issues MCQs Set 11

Answer: (b) Eutrophic lake

Explanation:
1. Algal bloom is caused by nutrient enrichment and occurs in eutrophic lakes.

Teacher's Note:
1. Key fact: Algal bloom is caused by nutrient enrichment and occurs in eutrophic lakes.
2. Link this concept with the related terms in the chapter notes.

Answer: (d) Eichornia

Explanation:
1. Eichhornia (water hyacinth) has become a serious water weed in India.

Teacher's Note:
1. Key fact: Eichhornia (water hyacinth) has become a serious water weed in India.
2. Link this concept with the related terms in the chapter notes.

Answer: (d) Deforestation

Explanation:
1. Deforestation reduces soil fertility and water retention and does not help agriculture.

Teacher's Note:
1. Key fact: Deforestation reduces soil fertility and water retention and does not help agriculture.
2. Link this concept with the related terms in the chapter notes.

Answer: (d) CO2

Explanation:
1. CO, SO2 and hydrocarbons are harmful pollutants, while CO2 is not normally classed as a pollutant in this sense.

Teacher's Note:
1. Key fact: CO, SO2 and hydrocarbons are harmful pollutants, while CO2 is not normally classed as a pollutant in this sense.
2. Link this concept with the related terms in the chapter notes.

Answer: (b) SO2 + NO2

Explanation:
1. SO2 and NO2 dissolve in rain water forming sulphuric and nitric acids.

Teacher's Note:
1. Key fact: SO2 and NO2 dissolve in rain water forming sulphuric and nitric acids.
2. Link this concept with the related terms in the chapter notes.

Answer: (d) 2 and 3 both

Explanation:
1. Photochemical smog contains nitrogen oxides, ozone and PAN.

Teacher's Note:
1. Key fact: Photochemical smog contains nitrogen oxides, ozone and PAN.
2. Link this concept with the related terms in the chapter notes.

Answer: (d) Lack of air pollution

Explanation:
1. Lichens are sensitive to SO2, so their presence indicates absence of air pollution.

Teacher's Note:
1. Key fact: Lichens are sensitive to SO2, so their presence indicates absence of air pollution.
2. Link this concept with the related terms in the chapter notes.

Answer: (b) CO2

Explanation:
1. Carbon dioxide is the main greenhouse gas contributing to global warming.

Teacher's Note:
1. Key fact: Carbon dioxide is the main greenhouse gas contributing to global warming.
2. Link this concept with the related terms in the chapter notes.

Answer: (a) DDT

Explanation:
1. DDT is non-biodegradable and accumulates along the food chain (biomagnification).

Teacher's Note:
1. Key fact: DDT is non-biodegradable and accumulates along the food chain (biomagnification).
2. Link this concept with the related terms in the chapter notes.

Answer: (b) Industrial waste

Explanation:
1. Industrial waste is a main cause of water pollution.

Teacher's Note:
1. Key fact: Industrial waste is a main cause of water pollution.
2. Link this concept with the related terms in the chapter notes.

Answer: (d) Sewage

Explanation:
1. Sewage is the most important source of water pollution.

Teacher's Note:
1. Key fact: Sewage is the most important source of water pollution.
2. Link this concept with the related terms in the chapter notes.

Answer: (d) All the above

Explanation:
1. Sewage treatment, controlling blasts and using electric vehicles all reduce pollution.

Teacher's Note:
1. Key fact: Sewage treatment, controlling blasts and using electric vehicles all reduce pollution.
2. Link this concept with the related terms in the chapter notes.

Answer: (c) Leaf tip and leaf margins

Explanation:
1. Fluoride causes necrosis and chlorosis in leaf tips and margins.

Teacher's Note:
1. Key fact: Fluoride causes necrosis and chlorosis in leaf tips and margins.
2. Link this concept with the related terms in the chapter notes.

Answer: (a) Excessive release of NO2 and SO2 by burning of fossil fuels.

Explanation:
1. Burning fossil fuels releases SO2 and NO2, which cause acid rain.

Teacher's Note:
1. Key fact: Burning fossil fuels releases SO2 and NO2, which cause acid rain.
2. Link this concept with the related terms in the chapter notes.

Answer: (a) Erosion

Explanation:
1. Removal of surface soil by wind or water is soil erosion.

Teacher's Note:
1. Key fact: Removal of surface soil by wind or water is soil erosion.
2. Link this concept with the related terms in the chapter notes.

Answer: (a) High production in an aquatic ecosystem

Explanation:
1. Eutrophication is nutrient enrichment leading to high production in an aquatic ecosystem.

Teacher's Note:
1. Key fact: Eutrophication is nutrient enrichment leading to high production in an aquatic ecosystem.
2. Link this concept with the related terms in the chapter notes.

Answer: (b) Los Angeles

Explanation:
1. Photochemical smog was first reported in Los Angeles.

Teacher's Note:
1. Key fact: Photochemical smog was first reported in Los Angeles.
2. Link this concept with the related terms in the chapter notes.

Answer: (a) Biodegradable pollution

Explanation:
1. Domestic waste is mostly organic and therefore biodegradable.

Teacher's Note:
1. Key fact: Domestic waste is mostly organic and therefore biodegradable.
2. Link this concept with the related terms in the chapter notes.

Answer: (c) Human waste

Explanation:
1. Human waste (sewage) is the major source of BOD in the Ganga.

Teacher's Note:
1. Key fact: Human waste (sewage) is the major source of BOD in the Ganga.
2. Link this concept with the related terms in the chapter notes.

Answer: (c) Tertiary consumer

Explanation:
1. DDT concentration increases along the food chain, so it is highest in the tertiary consumer.

Teacher's Note:
1. Key fact: DDT concentration increases along the food chain, so it is highest in the tertiary consumer.
2. Link this concept with the related terms in the chapter notes.