Biology Ecosystems MCQs Chapter 11 Class 12

Biology Ecosystems for Second Year Entry Tests and FSC Board Exams

Ecosystems is an important chapter in Second Year Biology (Class 12) that explains how living organisms interact with each other and their environment. This topic is highly relevant for students preparing for MDCAT, NUMS, AKU, NUST, UET ECAT, and FSC Second Year board exams. Key concepts include types of ecosystems, biotic and abiotic components, energy flow, food chains, food webs, and ecological pyramids, which are frequently tested in MCQs and short-answer questions.

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Created on March 02, 2022 By Ali Durrani

Biology Ch 11 Class 12

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1 / 20

The biosphere covers about

. 8-10 km

5-10 km

15-30 km

16-20 km

2 / 20

Wood forests form the

Pioneers community

Climax community

Top community

Transient community

3 / 20

Which statement is true?

Producers are heterotrophic organisms

Consumers are autotrophic organisms

Fungi and bacteria are decomposers

Consumers release chemical elements as ions

4 / 20

Study of a single population’s relationship to its environment is called

Ecology

Synecology

Autecology

Niche

5 / 20

Sequence of changes in community and its non-living environment over a period of time is

Niche

Succession

Alterations

Neo-ecology

6 / 20

Major regional ecological community of plants and animals forms

Biosphere

Biomass

Biomes

Bioecosystem

7 / 20

Disease in living organisms caused by parasites is called

Parasitism

Infestation

Predation

Infection

8 / 20

The role a species plays in a community including behavior and influence is

Nichon

Niche

Autecology

Profession

9 / 20

Plants growing in xeric conditions are called

Spherophytes

Mesophytes

Xerophytes

Teridophytes

10 / 20

Diverse and stable community at the end of succession is

Diverse Climax communityand stable community at the end of succession is A. Climax community B. Pioneers community C. Top community D. Stable community Answer & Explanation Answer: Option A

Pioneers community

Top community

Stable community A

11 / 20

Mosses are

Dermatocarpon

Permellia

Tortula

Both b and c

12 / 20

All populations within an ecosystem interconnected to one another are known as

Species

Family

Community

Biomes

13 / 20

Secondary succession starts from A.

A bar rock sand

Clear glacial pool

From remains of previous ecosystem

Fire

14 / 20

Hydrosere is

Secondary succession starting in a pond

. Primary succession starting in a pond

Primary succession starting on a dry soil

All of these

15 / 20

Study of relationship of organisms to their environment is

Ecology

Palaentology

Geology

None of these

16 / 20

The actual location or place where an organism lives is

Environment

Biosphere

Biomass

Habitat

17 / 20

A dual organism composed of symbiotic association of an alga living within a fungus myceliium is

Mycorrhiza

Rhizobium

Lichen

Legume

18 / 20

Abiotic components include

Atmosphere

Hydrosphere

Lithosphere

All of these

19 / 20

Lichen and algae form

Climax community

Pioneers community

Initiator community

Seral community

20 / 20

Legume plants are the hosts to

Rhizobium

Mycorrhiza

Lichen

Algae

Your score is

The average score is 68%

Importance of Ecosystems in Competitive Biology

Understanding Ecosystems helps students explain ecological interactions, nutrient cycling, population dynamics, and environmental balance. Topics such as carbon and nitrogen cycles, ecological succession, biodiversity, and human impact on ecosystems are commonly asked in entry tests. Practicing chapter-wise MCQs, diagrams, and topic-wise exercises strengthens conceptual clarity, improves accuracy, and enhances exam performance.

Effective Preparation and Practice Resources for Ecosystems

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

JazakAllah.