Biology Man and His Environment MCQs Chapter 13 Class 12

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Created on March 02, 2022 By Ali Durrani

Biology Ch 13 Class 12 Man and His Environment

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1 / 37

Overgrazing results in:

NUMS 2019 Cancelled
Biology
Man and His Environment
Elimination Tool:

A) Totally barren lands

B) Good pastured lands

C) Salinity

D) Rocky areas

2 / 37

Flow of energy in an ecosystem is:

NUMS 2014
Biology
Man and His Environment
Elimination Tool:

A) Unidirectional

B) Tridirectional

C) Multidirectional

D) Bidirectional

3 / 37

The position of an organism in a food chain of an ecosystem called:

NUMS 2018
Biology
Man and His Environment
Elimination Tool:

A) Level of ecosystem

B) Food chain

C) Food web

D) Trophic level

4 / 37

Tides are caused by

Gravitational pull of sun

Movements of large animals in water

Uneven water body floor

High winds

5 / 37

Which of the following statements is true about Savannah?

NTS 2015 DUHS and JSMU
Biology
Man and His Environment
Elimination Tool:

A) Dry season is very long and the temperature ranges more than 18 C throughout the year

B) Its plants do not shed off their leaves

C) The subsoil is permanently frozen

D) Rainfall is up to 200 cm per year

6 / 37

The productivity of aquatic ecosystem is determined by:

NUMS 2016
Biology
Man and His Environment
Elimination Tool:

A) Water

B) Light and nutrients

C) Light

D) Nutrients

7 / 37

Balance in the nutrient cycle can be upset when

Too much food is consumed

Not enough food is produced

Decayed nutrients are not returned to the ground

All of these

8 / 37

Water constitutes –% of body weight?

A. 25-30%

70-90%

10-30%

30-50%

9 / 37

Hot substance is escaped from inside the earth in the form of

Volcanoes

Hot springs

Geysers

All of these

10 / 37

Conversion of ammonium into nitrates is:

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Nitrification

B) Nitrogen Fixation

C) Ammonification

D) Denitrification

11 / 37

Wild life refers to

All plants of the world

All non cultivated plant

Non domesticated animals

Both b and c

12 / 37

Total area of the world under cultivation is

11%

21%

31%

13 / 37

In oceans of tropical regions

Temperature of surface water is 40?C and 10?C at depth

Temp of surface water is 25?C and 5?C at depth

Surface water 50?C and depth 20?C

Surface water 10?C and depth 15?C

14 / 37

Study of human population and things that affect them is

Ecology

Demography

Demology

Environment

15 / 37

Process that supplies food to living things through decaying and decomposition is called

. Food cycle

Nutrient cycle

Dead-live cycle

None of these

16 / 37

Greenhouse gases are those that:

NUMS 2015
Biology
Man and His Environment
Elimination Tool:

A) Prevent entry of ultraviolet rays

B) Prevent rainfall

C) Prevent heat to escape

D) All given options are correct

17 / 37

In a forest, there are a lot of plants; trees, shrubs, and herbs. What will the Palm trees face if they grow in the same forest?

NTS 2019
Biology
Man and His Environment
Elimination Tool:

A) Intraspecific competition.

B) Interspecific competition

C) Environmental competition

D) All of the above

18 / 37

Endangered species are

Dangerous for the life of humans

Reduced in number

Already extinct

All of these

19 / 37

When resources gets scarce, the population growth?

PMC Practice 1
Biology
Man and His Environment
Elimination Tool:

A) Becomes fast

B) Slows down

C) Remains same

D) None of these

20 / 37

In air % of oxygen and carbon dioxide is

Oxygen 20%, CO2 0.03%

Oxygen 50%, CO2 50%

Oxygen 30%, CO2 0.05%

Oxygen 25%, CO2 0.02%

21 / 37

Wind blows from area of

Low pressure to high pressure

High pressure to low pressure

Moderate pressure to high pressure

Low pressure to low pressure

22 / 37

Which of the following is not correct for food web?

NUMS 2019 Cancelled
Biology
Man and His Environment
Elimination Tool:

A) Start with primary consumers

B) Formed from food chain

C) Stable than food chain

D) Complex with food chain

23 / 37

In nitrogen fixation, nitrogen is converted to:

NUMS 2019 Cancelled
Biology
Man and His Environment
Elimination Tool:

A) Nitrate ions and ammonia

B) Atomic nitrogen

C) Urea

D) All of these

24 / 37

Study of environmental relations is called:

NUMS 2018
Biology
Man and His Environment
Elimination Tool:

A) Physiology

B) Pulmonology

C) Morphology

D) Ecology

25 / 37

In air nitrogen is

57%

20%

79%

30%

26 / 37

Grassland of Argentina is:

NUMS 2015
Biology
Man and His Environment
Elimination Tool:

A) Prairies

B) Savana

C) Boreal

D) Pampas

27 / 37

Which one is a non-renewable resource?

Wild life

Forests

Natural gas

Land

28 / 37

Which of the following describes an ecological niche?

NTS 2015 SMBBMC
Biology
Man and His Environment
Elimination Tool:

A) The habitat in which an organism finds its food supply

B) The habitat in which an organism find the most suitable climate

C) the relationship between an organism and other species

D) the way in which an environment is exploited by an organism

29 / 37

The actual or preserved remains of the organisms that lived in the ancient past are called:

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Fossils

B) Impression

C) Ancient prints

D) Ancient cast

30 / 37

Hydroelectricity is generated by using ______ of falling water.

Potential energy

Gravitational energy

Kinetic energy

. All of these

31 / 37

Which statement is true?

20% of total water is in the form of frozen ice caps

80% is in oceans

1% as fresh water lakes, streams and rivers

10% is in canals

32 / 37

Which of the following trophic levels has the largest biomass in ecosystems?

NUMS 2018
Biology
Man and His Environment
Elimination Tool:

A) Decomposers

B) Primary consumer

D) Producers

C) Secondary consumer

33 / 37

Geothermal energy is

. Energy obtained from nuclear fuel

Energy obtained from burning natural fuels

Heat energy trapped underground

Energy obtained from blowing hot winds

34 / 37

Driving force for all the cycles in ecosystem is

Water

Soil

Sun

Air

35 / 37

Process ensuring the survival of species over long periods of time, even though individual members of the species die.

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Reproduction

B) Adaptability

C) Mitosis

D) Respiration

36 / 37

An area previously supporting life is made barren, the subsequent recolonization is called ______.

UHS 2018
Biology
Man and His Environment
Elimination Tool:

A) Climax community

B) Pioneer succession

C) Primary succession

D) Secondary succession

37 / 37

The animals that feed on organic debris from decomposing plants and animals are called:

NUMS 2018
Biology
Man and His Environment
Elimination Tool:

A) Herbivores

B) Carnivores

C) Omnivores

D) Detritivores

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