Ecosystem : General Science MCQ Practice Questions & Answers (Tamil) - Page 2

General ScienceEasyEcosystem

21.

Photosynthesis is found in

A

Producers

B

Decomposers

C

Consumers

D

Scavengers

General ScienceEasyEcosystem

22.

A Hawk that eats a frog is a

A

Producer

B

Primary Consumer

C

Secondary Consumer

D

Tertiary Consumer

General ScienceEasyEcosystem

23.

Sedimentation is a

A

Primary water treatment

B

Secondary water treatment

C

Tertiary water treatment

D

Final process

General ScienceEasyEcosystem

24.

The relationship between nitrogen fixing bacteria and leguminous plants is an example for Parasitism

A

Predation

B

Mutualism

C

Commensalism

D

Symbiosis

General ScienceEasyEcosystem

25.

Favorable morphological and physiological response to a change in environment is called

A

Preadaptation

B

Ecotyping

C

Formation of ecophenes

D

Acclimatisation

General ScienceEasyEcosystem

26.

African grasslands are called

A

Prairies

B

Pampas

C

Savannah

D

None

General ScienceEasyEcosystem

27.

An example of lotic system

A

Pond

B

River

C

Lake

D

Reservoir

General ScienceEasyEcosystem

28.

An example of an abiotic component

A

Plants

B

Soil

C

Animals

D

Bacteria

General ScienceEasyEcosystem

29.

North American grassland are called

A

Pampas

B

Prairies

C

Savannah

D

None

General ScienceEasyEcosystem

30.

Which is an example for sedimentary biogeochemical cycle

A

Oxygen cycle

B

Nitrogen cycle

C

Water cycle

D

Phosphorus cycle

General ScienceEasyEcosystem

31.

Nitrogen gas returns to the atmosphere by the action of

A

Nitrogen fixing bacteria

B

Denitrifying bacteria

C

Nitrifying bacteria

D

Nitrate fertilizers

General ScienceEasyEcosystem

32.

The source of atmospheric oxygen is

A

Nitrogen cycle

B

Green Plants

C

Water

D

Carbon Cycle

General ScienceEasyEcosystem

33.

The area to which a species is biologically adapted to live is known as ............................

A

Niche

B

Habitat

C

Succession

D

Community

General ScienceEasyEcosystem

34.

What is Plankton?

A

Microscopic floating organisms – Plants and animals.

B

bottom dwelling aquatic organisms

C

large plants in water

D

none

General ScienceEasyEcosystem

35.

Gas released during photosynthesis is

A

Methane

B

Nitrogen

C

Oxygen

D

Carbon dioxide

General ScienceEasyEcosystem

36.

Green plants are absent in deep sea. Why?

A

Light is absent

B

High pressure

C

Low temperature

D

Great depth

General ScienceEasyEcosystem

37.

The Primary Consumers are also called as

A

Herbivores

B

Carnivores

C

Enzymes

D

None of these

General ScienceEasyEcosystem

38.

The species that flower are called

A

angiosperms

B

algae

C

gymnosperms

D

bryophytes

General ScienceEasyEcosystem

39.

The first trophic level in a food chain

A

Carnivores

B

Bacteria

C

Green Plants

D

Herbivores

General ScienceEasyEcosystem

40.

All the genes of a population is called

A

gene bunch

B

gene population

C

gene pool

D

genome

Ecosystem in General Science : Practice MCQ Questions & Answers with Explanations