Biology Major Ecosystems MCQs Chapter 12 Class 12

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Created on March 02, 2022

Biology Ch 12 Class 12

1 / 19

Which statement about profundal zone is correct?

Plants are unable to anchor but enough light penetrates to support photosynthesis

Phytoplanktons in this region are cyanobacteria

Decomposers and detritus feeders inhabit it

Water lilies are abundant

2 / 19

Development of bark in plants and skin in animals is a method for

Providing support

Protection from enemies

Reducing water loss

Helping in food production

3 / 19

End of earth’ is related to

Tropical rain forest

Temperate deciduous forest

Savanna

Tundra

4 / 19

One of the most important cause of desertification is

Floods

Wind blowing

Raining

Deforestation

5 / 19

Ecosystem of Shogran is

Coniferous alpine

Boreal

temperate deciduous

Grassland

6 / 19

Desert ecosystem of Mianwali is

Thar

Thal

Cholistan

None

7 / 19

Zone of lake water which is of open water near the surface is

Littoral

Limnetic

Profundal

Benthic

8 / 19

Productivity of an ecosystem is indicated by

Number of plants in that ecosystem

The density of that ecosystem

Consumption of carbon dioxide and evolve of oxygen

Both a and b

9 / 19

Temperature of temperate deciduous forests is

4-30 degree

45-50 degree

20-25 degree C

5-10 degree

10 / 19

Eutrophication is

Process of decreasing nutrients by human activities

Adequate nutrition accelerated by human activities

Changing the trophic levels of an ecosystem by human activities

Addition of more predators in an ecosystem

11 / 19

In which zone plant community is most diverse

Limnetic zone

Littoral zon

Profundal zone

All of these

12 / 19

Annual rainfall in grass land i

1500-2500 mm

750-1500 mm

250-750 mm

250-500 mm

13 / 19

In polluted lake which organisms dominate the community

Fish

Crustaceans

Phytoplanktons

Blue green algae

14 / 19

Weather refers to

Short-term fluctuations in temperature, cloud cover, wind and precipitation

It prevails over periods of hrs or days

Overall patterns of weather that prevail from year to year

. Both a and b

15 / 19

Which statement about hydrospheric ecosystem is incorrect?

Salt water ocean and sea are the largest ecosystems on earth

Salt water ecosystem covers about 75% earth surface

Fresh water ecosystem covers less than 1% of earth surface

It temperature is more moderate to support life

16 / 19

Coniferous forests located at high altitude are called

Taiga

Alpine

Boreal

Arctic

17 / 19

Evolution of vascular bundles in plants and skeleton in animals is an adaptation for

Hdrospheric ecosystem

Aquatic ecosystem

Terrestrial ecosystem

All of these

18 / 19

Mountains of Koh Hindukush come under

Tundra

Grass land

Tropical forests

Temperate deciduous

19 / 19

Which statement is incorrect?

Average rainfall in temperate deciduous forests is 750-1500mm

empera ture of coniferous alpine and boreal forests is upto 10 degrees

Northern coniferous forests are called Taiga

Coniferous forests located at high latitude are alpine

Your score is

The average score is 61%

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Biology Major Ecosystems MCQs Chapter 12 Class 12

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