Environmental Science MCQ (Multiple Choice Question) - Schoolingaxis.com

Que- Which of the following is not a reason why water warms and cools much more slowly than land?

a. Solar energy penetrates more deeply into water

b. Heat energy is mixed in a deeper layer of water

c. Water has a higher heat capacity

d. It takes more heat to raise the temperature of a given amount of soil 1oC  than it does to raise the temperature of water 1oC

Answer- It takes more heat to raise the temperature of a given amount of soil 1oC  than it does to raise the temperature of water 1oC

Explanation-  Water warms and cools much more slowly than land because it takes more heat to raise the temperature of a given amount of soil 1oC  than it does to raise the temperature of water 1oC.

Que- The gas that shows the most variation from place to place and from time to time in the lower atmosphere:

a. Ozone (O3)

b. Carbon dioxide (CO2)

c. Water vapour (H2O)

d. Methane (CH4)

Explanation-  The gas that shows the most variation from place to place and from time to time in the lower atmosphere Water vapour (H2O).

Que- The atmospheric greenhouse effect is produced mainly by the:

a. Absorption and re-emission of visible light by the atmosphere

b. Absorption and re-emission of ultraviolet radiation by the atmosphere

c. Absorption and re-emission of infrared radiation by the atmosphere

d. Absorption and re-emission of visible light by clouds

Explanation-  The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere.Radiatively active gases (i.e., greenhouse gases) in a planet's atmosphere radiate energy in all directions. Part of this radiation is directed towards the surface, warming it. [3] The intensity of the downward radiation – that is, the strength of the greenhouse effect – will depend on the atmosphere's temperature and on the amount of greenhouse gases that the atmosphere contains.

Que- The blueness of the sky is mainly due to:

a. The scattering of sunlight by air molecules

b. The presence of water vapor

c. Absorption of blue light by the air

d. Emission of blue light by the atmosphere

Answer- The scattering of sunlight by air molecules

Explanation-  A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.  When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.

Que- The atmosphere near the earth's surface is  " heated from below. "  Which of the following does not significantly contribute to this heating?

a. Conduction of heat upward from a hot surface

b. Convection from a hot surface

c. Absorption of infrared energy that has been radiated from the surface

d. Heat energy from the earth's interior

Answer- Heat energy from the earth's interior

Explanation-  Heat energy from the earth's interior contribute to this heating.

Que- The gradual physiological adjustment to slowly changing new environmental conditions is known as

a. Selection

b. Introduction

c. Acclimatization

d. Quarantine

Explanation-  The limits of tolerance and optimal range of distribution may vary in different seasons in some species of animals.If some environmental factors shifts beyond the limit of tolerance of organism: in such condition the organisms can come to the resting stage or migrate or the can be acclimatise them in new environmental conditions.

Que- Salinization is ___________.

a. Accumulation of salts in water

b. Accumulation of salts in soil

c. Accumulation of salts in body

d. Accumulation of salts in animals

Answer- Accumulation of salts in soil

Explanation-  Salts enter the soil through irrigation; they originate either from geological layers, from groundwater or from man-made influences, such as fertilizers.Crops vary in their reaction to soil salinity.

Que-  " Earth provides enough to satisfy every man's need, but not for every man's greed "  words by

a. Tagore

b. Gandhiji

c. Nehru

d. None

Explanation-  Mahatma Gandhi was well aware of such tendencies. Hence his advice to use the bounties of nature, but not with an element of greed. He firmly believed that the 'Earth provides enough to satisfy every man's need, but not for every man's greed.'

Que- Endoderm forms

a. blood and bone

b. respiratory system

c. nervous system

d. viscera and digestive system

Explanation-  Endoderm forms viscera and digestive system.

Que- Which phytoplankton exists at the size of 60 micro metre?

a. Nanoplankton

b. Ultraplankton

c. Net plankton

d. Picoplankton

Explanation-  Nanoplankton exists at the size of 60 micro metre.

Que- Sea water is

a. acidic

b. alkaline

c. neutral

d. hypotonic

Explanation-  Sea water is acidic.

Que- Name the endangered animal which is protected in Rajamalai National Park

a. Chital

b. Black buck

c. Nilgiri Tahr

d. None

Explanation-  The park holds the maximum viable population of the endangered Nilgiri Tahr including other little known fauna Nilgiri marten, ruddy mongoose, small clawed otter, dusky striped squirrel etc.

Que- The inherent ability of organisms to reproduce and multiply is called

a. C value

b. biotic potential

c. carrying capacity

d. K value

Explanation-  The inherent ability of organisms to reproduce and multiply is called biotic potential.

Que- The effect of ozone depletion include

a. UV light reaches the earth

b. affect the climate

c. cause skin cancer

d. all the above

Explanation-  Ozone layer depletion causes increased UV radiation levels at the Earth's surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders.

Que- The true statement about  " green house effect "  is that it is

a. caused by combination of many gases

b. caused by CO2

c. caused only by CO2, CFC, CH4 and NO2 gases

d. None of these

Answer- caused only by CO2, CFC, CH4 and NO2 gases

Explanation-  The true statement about  " green house effect "  is that it is caused only by CO2, CFC, CH4 and NO2 gases.

Que- UV radiations is injurious to plants because it

a. break phosphate bonds

b. increases respiration

c. causes dehydration

d. causes genetic changes

Explanation-  UV radiations is injurious to plants because it causes genetic changes.

Que- _________ is the regulatory authority of quality in India.

a. CPCB

b. PCBC

c. CBCP

d. CPBC

Explanation-  CPCB is the regulatory authority of quality in India.

Que- Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

a. Conduction of heat through the interior of the earth

b. Concentration of earth's magnetic field lines at the poles

c. Circulation of heat by the atmosphere and oceans

d. The insulating properties of snow

Answer- Circulation of heat by the atmosphere and oceans

Explanation-  A radiation inversion is most commonly observed: just above the ground. Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by: the circulation of heat by the atmosphere and the oceans.

Que- The intermediate developmental stages in the ecological succession is called

a. sere

b. ecesis

c. climax

d. nudation

Explanation-  A seral community (or sere) is an intermediate stage found in ecological succession in an ecosystem advancing towards its climax community.

Que- The final stable community in an ecological succession is called the

a. final community

b. ultimate community

c. climax community

d. seral community

Explanation-  The final or stable community in a sere is the climax community or climatic vegetation. It is self-perpetuating and in equilibrium with the physical habitat.

Que- Typically, water vapour occupies about what percentage of the air's volume near the earth's surface?

c. Close to 10 percent

d. Less than 4 percent

Explanation-  Typically, water vapour occupies about less than 4 percent of the air's volume near the earth's surface.

Que- Heavy dust can cause:

a. leaf blights

b. opening of stomata

c. closure of stomata

d. browning of leaves

Explanation-  Heavy dust can cause closure of stomata.

Que- All oil traps contain:

a. an impermeable layer

b. an anticline

c. a fault

d. syncline

Explanation-  All oil traps contain an impermeable layer.

Que- The geographical pattern of average air temperature near sea level is ____ homogeneous in the southern hemisphere as compared to the northern hemisphere.

a. Less

b. More

c. Nothing can be said

d. None of the mentioned above

Explanation- No explanation is given for this question

Que- In the northern hemisphere, north-facing hillsides have a ____ growing season than south-facing hillsides.

a. Shorter

b. Longer

c. More

d. Nothing can be said