Environmental Issues Test

Question 1
4 / -1

Given figure represents biomagnification of DDT in an aquatic food chain. Select the incorrect statement regarding this.

A
When agricultural fields are sprayed with DDT, it is carried by runoff water into nearby aquatic bodies.

B
River water may have a very low concentration of DDT, but the carnivorous fish in that river may contain high concentration of DDT, which is still suitable for consumption by human beings.

C
Increased concentration of DDT in birds affects calucium metabolism due to which egg shells become thin and break before maturity.

D
None of these.

Question 2
4 / -1

A higher biochemical oxygen demad in a particular segment of a river indicates that

A
the segment is free from pollution

B
the segment is highly polluted

C
aquatic life has started flourishing

D
the river has high number of aerobic bacteria

Question 3
4 / -1

The term 'terror of Bengal' is used for

A
algal bloom

B
eichhornia crassipes

C
increased biochemical oxygen demand

D
eutrophication

Question 4
4 / -1

The amount of biodegradable organic matter in sewage water can be estimated by measuring

A
biochemical oxygen demand

B
the growth of anaerobic bacteria in water

C
biogeological oxygen demand

D
the growth of aerobic bacteria in water

Question 5
4 / -1

High concentration of nutrients especially nitrates and phosphates in water can accelerate which of the following phenomenon?

A
Algal bloom

B
Eutrophication

C
Biomagnification

D
Both (a) and (b)

Question 6
4 / -1

Which of the following statements is not correct regarding algal blooms?

A
Algal blooms are formed by blue-green algae.

B
Growth of Eichhornia crassipes causes colouration of water during during algal blooms.

C
Increased growth of algae causes depletion of O₂ in water.

D
Algal blooms cause deterioration of water quality and fish mortality.

Question 7
4 / -1

Which of the following statements is not correct regarding biomagnification?
(i) Mercury accumulated by an organism cannot be metabolised.
(ii) In the process of biomagnification, concentration of DDT is increased at successive trophic levels.
(iii) Accumulation of cadmium can cause thinning of egg shell in birds.
(iv) DDT accumulation is a major cause of reduced population of fish eating birds.
(v) Biomagnification occurs only in aquatic food chain.

A
(i), (iii) and (v)

B
(iii) and (iv)

C
(iii) and (v)

D
(i), (ii) and (iv)

Question 8
4 / -1

Accelerated eutrophication occurs due to

A
increase in amount of dissolved oxygen

B
disposal of waste rich in nitrates and phosphates

C
increase in concentration of DDT and mercury in water

D
unsafe disposal of radioactive wastes

Question 9
4 / -1

Contamination of water sewage is indicated by cysts of

A
Escherichia

B
Entamoeba

C
Pseudomonas

D
Leishmania

Question 10
4 / -1

Escherichia coli is used as an indicator organism to determine pollution of water with

A
industrial effluents

B
heavy metals

C
pollen of aquatic plants

D
faecal matter

Question 11
4 / -1

A lake with an inflow of domestic sewage rich in organic waste may result in

A
drying of the lake very soon due to algal bloom

B
an increased production of fish due to lot of nutrients

C
death of fish due to lack of oxygen

D
increased population of aquatic food web organisms

Question 12
4 / -1

Minamata disease was caused due to the consumption of

A
Sea food containing lot of cadmium

B
Fish contaminated with mercury

C
Oysters with lot of pesticide

D
Sea food contaminated with selenium

Question 13
4 / -1

A lake near a village suffered heavy mortality of fishes within a few days. Which of the following statements could be the correct explanation for this?
(i) Lots of urea and phosphate fertillisers were used in the crops in the nearby fields.
(ii) The croplands of the village were fertillised fields rich in nitrate and phosphate.
(iii) The lake water turned green and stinky.
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

A
(i) and (iii)

B
(i), (ii) and (iii)

C
(ii), (iii) and (iv)

D
(iii) and (iv)

Question 14
4 / -1

DDT residues are rapidly passed through food chain causing biomagnification because DDT is

A
water soluble

B
lipid soluble

C
moderately toxic

D
non-toxic to aquatic animals

Question 15
4 / -1

Phosphate pollution is brought about by

A
phosphate rocks

B
automobile exhausts

C
sewage and phosphate rocks

D
sewage and agricultural fertilisers

Question 16
4 / -1

Fluoride pollution mainly affects

A
Brain

B
Heart

C
Teeth

D
Kidneys

Question 17
4 / -1

Which among the following is likely to have the highest levels of DDT deposition in its body?

A
Sea gull

B
Phytoplankton

C
Eel

D
Crab

Question 18
4 / -1

A dental disease characterized by mottling of teeth is due to presence of a certain chemical element in drinking water. Which is that element?

A
Fluorine

B
Boron

C
Mercury

D
Chlorine

Question 19
4 / -1

Given below are four statements each with two blanks. Select the option which correctly fills up the blank in any two statements.
(i) Bhopal gas disaster took place on____ 1984 and this day is now observed as the____ day in India to make the anniversary of the Bhopal gas disaster.
(ii) ____ is a biodegradable pollutant while_____ is a non-biodegradable pollutant.
(iii) When pollutants are released from a single point it is called____ pollution, but when it is over a large area, then it is called____ pollution.
(iv) ___ is the world's most problematic aquatic weed, introduced in India for its lovely flowers, also called a s ____ .

A
(i) December 5, National pollution prevention (iv) Parthenium, terror of Bengal

B
(i) December 2, Bhopal gas tragedy (ii) DDT, sewage

C
(ii) Sewage, DDT (iii) point source, non-point source

D
(iii) line source, fixed source (iv) Eichhornia , tiger of Bengal

Question 20
4 / -1

A disease caused by eating fish contaminated by industrial waste, containing mercury compounds, is called as

A
Osteosclerosis

B
Hashinoto's disease

C
Bright's disease

D
Minamata disease

Submit Test

Environmental I...

Question 1

When agricultural fields are sprayed with DDT, it is carried by runoff water into nearby aquatic bodies.

River water may have a very low concentration of DDT, but the carnivorous fish in that river may contain high concentration of DDT, which is still suitable for consumption by human beings.

Increased concentration of DDT in birds affects calucium metabolism due to which egg shells become thin and break before maturity.

None of these.

Question 2

the segment is free from pollution

the segment is highly polluted

aquatic life has started flourishing

the river has high number of aerobic bacteria

Question 3

algal bloom

eichhornia crassipes

increased biochemical oxygen demand

eutrophication

Question 4

biochemical oxygen demand

the growth of anaerobic bacteria in water

biogeological oxygen demand

the growth of aerobic bacteria in water

Question 5

Algal bloom

Eutrophication

Biomagnification

Both (a) and (b)

Question 6

Algal blooms are formed by blue-green algae.

Growth of Eichhornia crassipes causes colouration of water during during algal blooms.

Increased growth of algae causes depletion of O2 in water.

Algal blooms cause deterioration of water quality and fish mortality.

Question 7

(i), (iii) and (v)

(iii) and (iv)

(iii) and (v)

(i), (ii) and (iv)

Question 8

increase in amount of dissolved oxygen

disposal of waste rich in nitrates and phosphates

increase in concentration of DDT and mercury in water

unsafe disposal of radioactive wastes

Question 9

Escherichia

Entamoeba

Pseudomonas

Leishmania

Question 10

industrial effluents

heavy metals

pollen of aquatic plants

faecal matter

Question 11

drying of the lake very soon due to algal bloom

an increased production of fish due to lot of nutrients

death of fish due to lack of oxygen

increased population of aquatic food web organisms

Question 12

Sea food containing lot of cadmium

Fish contaminated with mercury

Oysters with lot of pesticide

Sea food contaminated with selenium

Question 13

(i) and (iii)

(i), (ii) and (iii)

(ii), (iii) and (iv)

(iii) and (iv)

Question 14

water soluble

lipid soluble

moderately toxic

non-toxic to aquatic animals

Question 15

phosphate rocks

automobile exhausts

sewage and phosphate rocks

sewage and agricultural fertilisers

Question 16

Brain

Heart

Teeth

Increased growth of algae causes depletion of O₂ in water.