12th Class Biology Chapter 25 MCQs with Answers

AdminApril 5, 2024

0 10 1 minute read

Welcome to the 12th Class Biology Chapter 25 MCQs Practice and Quiz Tests. We are presenting you with top MCQ questions from the 12th Class Biology Chapter 25 Ecosystem.

You can find all the 12th Class Biology Chapter 25 MCQs online tests on our website. These online tests are great for learning and as well as for scoring maximum marks in your Intermediate Exams. We are making these Class 12 Biology MCQs online tests for those who want full marks in their exams.

12th Class Multiple Choice Question Chapter 25 with Answers Free PDF

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Grade 12 Biology Chapter 25 Online Quiz

By presenting 3 options to choose from, 12th Class Biology Chapter 25 Quiz which cover a wide range of topics and levels of difficulty, making them adaptable to various learning objectives and preferences. You will have to read all the given answers of 12th Class Questions and Answers and click over the correct answer.

Test Name: 12th Class Biology Chapter 25 Quiz Practice
Type: Quiz Test
Total Questions: 40
Total Marks: 40
Time: 40 minutes

Note: Answer of the questions will change randomly each time you start the test. Practice each quiz test at least 3 times if you want to secure high marks. Once you are finished, click the View Results button. If any answer looks wrong to you in Quizzes. simply comment below this post, so that we can update the answer in the quiz section.

12th Class Biology Chapter 25: Ecosystem

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1 / 40

Which of the following is an example of an abiotic factor in an ecosystem?

Decomposers

Predators

Temperature

2 / 40

What is the trophic level of an organism that feeds on primary consumers?

Secondary consumer

Tertiary consumer

Primary consumer

3 / 40

What is the difference between a food chain and a food web?

A food chain shows a single pathway of energy flow, while a food web shows multiple interconnected food chains

A food chain includes only producers, while a food web includes only consumers

A food chain is more complex than a food web

4 / 40

Which of the following is a limiting factor for plant growth in most ecosystems?

Phosphorus

Nitrogen

Carbon dioxide

5 / 40

What is the term for the process by which water evaporates from the leaves of plants?

Transpiration

Condensation

Precipitation

6 / 40

Which of the following is a characteristic of a stable ecosystem?

Rapid succession

Low biodiversity

High biodiversity

7 / 40

What is the term for the process by which carbon dioxide is released into the atmosphere by burning fossil fuels?

Combustion

Respiration

Photosynthesis

8 / 40

Which biome is characterized by grasses, scattered trees, and a lack of precipitation?

Grassland

Tundra

Rainforest

9 / 40

What is the term for the area where an organism lives and obtains its resources?

Niche

Population

Habitat

10 / 40

What is the process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen?

Decomposition

Respiration

Photosynthesis

11 / 40

What is the term for the process by which pollutants accumulate in the tissues of organisms as they move up the food chain?

Eutrophication

Biomagnification

Acidification

12 / 40

Which of the following is a greenhouse gas that contributes to global warming?

Nitrogen

Carbon dioxide

Oxygen

13 / 40

Which biome is characterized by low temperatures, little precipitation, and permafrost?

Desert

Tundra

Grassland

14 / 40

What is the term for the number of different species in a given area?

Abundance

Biomass

Biodiversity

15 / 40

What is the term for the process by which water moves through the soil and into groundwater?

Percolation

Runoff

Infiltration

16 / 40

What is the trophic level of an organism that feeds directly on producers?

Tertiary consumer

Primary consumer

Secondary consumer

17 / 40

Which of the following is an example of a natural ecosystem service?

Pollination

Pesticide application

Irrigation

18 / 40

Which of the following is a measure of the total amount of dissolved salts in water?

Turbidity

Salinity

pH level

19 / 40

What is the term for the process by which nitrogen gas is converted into ammonia by bacteria?

Denitrification

Nitrogen fixation

Nitrification

20 / 40

What is the term for the process by which nitrogen compounds are converted back into nitrogen gas by bacteria?

Nitrification

Denitrification

Nitrogen fixation

21 / 40

What is the term for the process by which organisms regulate their internal environment to maintain stability?

Adaptation

Competition

Homeostasis

22 / 40

What is the term for the role of an organism within its ecosystem?

Niche

Habitat

Trophic level

23 / 40

What is a decomposer in an ecosystem?

An organism that consumes other organisms

An organism that breaks down dead organic matter into simpler substances

An organism that produces its own food through photosynthesis

24 / 40

Which of the following is an example of a biotic factor in an ecosystem?

Sunlight

Soil

Plants

25 / 40

Which of the following is a primary source of phosphorus for ecosystems?

Water

Rocks

Atmosphere

26 / 40

What is a producer in an ecosystem?

An organism that decomposes dead matter

An organism that eats other organisms

An organism that produces its own food through photosynthesis

27 / 40

What is the term for the process by which excess nutrients in water lead to increased plant growth and oxygen depletion?

Acidification

Eutrophication

Biomagnification

28 / 40

What is the term for all the living organisms in an ecosystem?

Abiotic factors

Biotic factors

Decomposers

29 / 40

What is the term for the gradual process of change and replacement of the types of species in a community?

Evolution

Adaptation

Succession

30 / 40

Which biome is characterized by dense forests with high levels of precipitation?

Rainforest

Desert

Tundra

31 / 40

What is the term for the total mass of living organisms in a given area?

Abundance

Biomass

Biodiversity

32 / 40

What is the term for the study of the interactions between organisms and their environment?

Ecology

Genetics

Evolution

33 / 40

What is the trophic level of an organism that feeds on secondary consumers?

Primary consumer

Secondary consumer

Tertiary consumer

34 / 40

What is a consumer in an ecosystem?

An organism that obtains energy by consuming other organisms

An organism that decomposes dead matter

An organism that produces its own food through photosynthesis

35 / 40

Which of the following is a human activity that can disrupt ecosystems?

Reforestation

Conservation

Deforestation

36 / 40

What is the term for the process by which bacteria convert ammonia into nitrites and then into nitrates?

Nitrification

Denitrification

Nitrogen fixation

37 / 40

What is the term for the process by which water moves from the atmosphere to the Earth's surface?

Evaporation

Transpiration

Precipitation

38 / 40

What is the term for the process by which nutrients are returned to the soil from dead and decaying organisms?

Photosynthesis

Respiration

Decomposition

39 / 40

What is the primary source of energy in most ecosystems?

Sunlight

Soil

Water

40 / 40

What is an ecosystem?

A biological community of interacting organisms and their physical environment

A laboratory experiment

A single organism

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AdminApril 5, 2024

0 10 1 minute read