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Botany NEET Questions — Free MCQ Practice

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A large quantity of urban sewage is drained to nearby village river. Which among the given conditions would happen after mixing of sewage into the river?

(i) Biochemical oxygen demand (BOD) of receiving water body increases.
(ii) Dissolved oxygen of receiving water body decreases.
(iii) It will not cause mortality among fishes and other aquatic creatures
(iv) It will lead to nutrient enrichment of receiving water body.

A.

(i), (ii) and (iii)

B.

(i), (ii) and (iv)

C.

(ii) and (iii)

D.

(iii) and (iv)

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Explanation

(b) :When sewage, having biodegradable organic matter is released in water body micro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen to decompose the sewage and as a result there would be a sharp decline in dissolved oxygen downstream from the point of sewage discharge, and biological oxygen demand (BOD) would increase Presence of large amount of nutrients in water causes excessive growth of planktonic (free- floating) algae, called algal bloom. Algal bloom causes deterioration of water quality and fish mortality

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One greenhouse gas contributes 14% to total global warming and another contributes 6%. These are respectively identified as

A.

N₂O and CO₂

B.

CFCs and N₂O

C.

methane and CO₂

D.

methane and CFCs

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Explanation

(b)

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Which one option is incorrectly matched regarding biological magnification of DDT in aquatic ecosystem.

A.

Small fish 0.5 ppm

B.

Large fish 2 ppm

C.

Fish eating birds 25ppm

D.

Zoopkankton 0.003 ppm

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Explanation

(d) The correct matching is as follows: Zooplankton - 0.04 ppm
In biological magnification of DDT, concentration of DDT is 0.003 ppm in phytoplanton.

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Which one is matched correctly?

A.

Arsenic-Black foot disease

B.

Fluoride--Itai-itai

C.

Mercury-Skeletal fluorosis

D.

Cadmium-Minamata disease

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Explanation

(a) Black foot disease caused by arsenic is a severe form of peripheral vascular disease. It has been observed in Taiwan.
Flouride - Skeletal fluorosis
Mercury - Minamata disease
Cadmium - Itai-itai

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Green muffler play a important role against

A.

noise pollution

B.

radioactive pollution

C.

soil pollution

D.

air pollution

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Explanation

(a) Green plant on roadsides are often considered as green mufler. These green belt minimise noise pollution.

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The government of india in 1980s has introduced a concept to work closely with the local communities for protecting and managing forests. The concept is

A.

Forest Research Institutes

B.

Panel of focal communities for forest management

C.

Joint forest Management

D.

Jhum Cultivation

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Explanation

Joint Forest Management (JFM) is introduced so as to work closely with the local communities for protecting and managing forests.

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The thickness of the ozone is measured in terms of:-

A.

P

B.

DU

C.

µ

D.

RA

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Explanation

The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson Units (DU).

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Agents that bring undesirable change in biological, physical and chemical environment is called

A. Pollutant B. Bioparcy C. Bioinformatics D. Biomagnification

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Explanation

Page number 270

Introduction

Environmental Issues

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The act to control environmental pollution is passed by Government of India is

A. Environment Pollution Act-1981 B. Environment Pollution Act-1986 C. Environment Protection Act-1986 D. Environment Protection Act-1981

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Explanation

Page number 270

Introduction

Environmental Issues

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Environment Protection Act protects and improves the quality of

A. Air B. Water C. Soil D. All of these

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Explanation

Page number 270

Introduction

Environmental Issues

Botany MCQs for NEET — Practice Questions with Answers

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