Biology Major Ecosystems MCQs Chapter 12 Class 12

Biology Major Ecosystems for Second Year Entry Tests and FSC Board Exams

Major Ecosystems is a significant chapter in Second Year Biology (Class 12) that explains the different types of ecosystems found on Earth and their characteristics. This topic is important for students preparing for MDCAT, NUMS, AKU, NUST, UET ECAT, and FSC Second Year board exams. Key concepts include forest ecosystems, grasslands, deserts, freshwater and marine ecosystems, and tundra, which are frequently tested in MCQs and conceptual questions.

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Created on March 02, 2022 By Ali Durrani

Biology Ch 12 Class 12

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1 / 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

2 / 19

In polluted lake which organisms dominate the community

Fish

Crustaceans

Phytoplanktons

Blue green algae

3 / 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

4 / 19

Ecosystem of Shogran is

Coniferous alpine

Boreal

temperate deciduous

Grassland

5 / 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

6 / 19

Annual rainfall in grass land i

1500-2500 mm

750-1500 mm

250-750 mm

250-500 mm

7 / 19

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

Hdrospheric ecosystem

Aquatic ecosystem

Terrestrial ecosystem

All of these

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

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

10 / 19

Temperature of temperate deciduous forests is

4-30 degree

45-50 degree

20-25 degree C

5-10 degree

11 / 19

Desert ecosystem of Mianwali is

Thar

Thal

Cholistan

None

12 / 19

Coniferous forests located at high altitude are called

Taiga

Alpine

Boreal

Arctic

13 / 19

In which zone plant community is most diverse

Limnetic zone

Littoral zon

Profundal zone

All of these

14 / 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

15 / 19

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

Littoral

Limnetic

Profundal

Benthic

16 / 19

End of earth’ is related to

Tropical rain forest

Temperate deciduous forest

Savanna

Tundra

17 / 19

One of the most important cause of desertification is

Floods

Wind blowing

Raining

Deforestation

18 / 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

19 / 19

Mountains of Koh Hindukush come under

Tundra

Grass land

Tropical forests

Temperate deciduous

Your score is

The average score is 61%

Importance of Major Ecosystems in Competitive Biology

A clear understanding of Major Ecosystems helps students explain energy flow, ecological interactions, biodiversity, and adaptations of organisms in various habitats. Topics such as trophic levels, food chains, food webs, and human impacts on ecosystems are commonly asked in entry tests. Practicing chapter-wise MCQs, diagrams, and topic-wise exercises improves conceptual clarity, accuracy, and performance in exams.

Effective Preparation and Practice Resources for Major Ecosystems

Effective preparation for Major Ecosystems includes regular revision, MCQ practice, and mock testing. Solving past papers and exam-focused questions helps students identify frequently tested areas and strengthen weak concepts. PLS Academy provides structured learning resources that allow students to systematically prepare for Major Ecosystems and perform confidently in medical entry tests and FSC Second Year board examinations.

JazakAllah.

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Biology Major Ecosystems MCQs Chapter 12 Class 12

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