CBSE Class 7 Science Chapter 12 Forests: Our Lifeline MCQ Questions

Chapter 12 Forests: Our Lifeline is an important part of the CBSE Class 7 Science syllabus. This chapter explains how forests are like the “green lungs” of our Earth and why they are essential for all living beings. It deals with topics such as the role of trees, plants, animals, microorganisms, soil, and water in maintaining the balance of nature.

To help students score better marks in exams, we have prepared a set of MCQ questions with answers. These questions are designed from the NCERT Class 7 Science solutions and cover every key detail of the chapter. Practicing these MCQs will make the concepts of the chapter easy to understand and will also help in quick revision before exams.

These Forests: Our Lifeline Class 7 MCQs focus on:

• Importance of forests in our life
• Interdependence of plants, animals, and decomposers
• Role of forests in maintaining oxygen and carbon dioxide balance
• Protection of soil and water by forests
• Deforestation and its harmful effects

By solving these Class 7 science MCQs regularly, along with NCERT Solutions students will be able to score good marks in their science exam.

Forests: Our Lifeline Class 7 MCQs

Class 7 Students are advised to follow NCERT Solutions of this chapter first and then solve these MCQ Questions and worksheets that are prepared by Infinity learn as per latest CBSE syllabus. These MCQ questions will help individual to clear their concept easily 

Chapter-wise CBSE Class 7 Science MCQs 2025 with Answers

Science Chapter 12 Forests: Our Lifeline Class 7 MCQ Questions with Answers

1. Which component of the forest directly supports the recycling of nutrients back into the soil?
   a) Canopy
   b) Decomposers
   c) Shrubs
   d) Herbivores
   Answer: b) Decomposers
2. If trees in a forest are cut down rapidly, which cycle will be disturbed first?
   a) Carbon cycle
   b) Nitrogen cycle
   c) Water cycle
   d) Oxygen cycle
   Answer: c) Water cycle
3. The “lungs of the planet” role of forests is mainly due to their ability to:
   a) Reduce humidity
   b) Absorb solar energy
   c) Exchange gases through photosynthesis
   d) Store minerals in soil
   Answer: c) Exchange gases through photosynthesis
4. The role of forests in preventing soil erosion is best explained by:
   a) Roots binding soil particles
   b) Leaves absorbing rainwater
   c) Trunks storing minerals
   d) Canopy trapping sunlight
   Answer: a) Roots binding soil particles
5. In a dense forest, the lowest amount of sunlight reaches which layer?
   a) Canopy
   b) Shrub layer
   c) Forest floor
   d) Understory
   Answer: c) Forest floor
6. If decomposers like fungi disappear from forests, the first effect will be:
   a) More fresh air
   b) Accumulation of dead matter
   c) Faster seed growth
   d) Extra rainfall
   Answer: b) Accumulation of dead matter
7. Which gas is absorbed by plants in photosynthesis and released by animals during respiration?
   a) Oxygen
   b) Carbon dioxide
   c) Nitrogen
   d) Methane
   Answer: b) Carbon dioxide
8. Which of the following forms a direct food chain in the forest?
   a) Grass → Deer → Tiger
   b) Soil → Tree → Crow
   c) Leaf → Sunlight → Monkey
   d) Water → Fish → Leopard
   Answer: a) Grass → Deer → Tiger
9. Why do forests maintain the groundwater level?
   a) They increase evaporation
   b) They trap dust particles
   c) They allow rainwater to seep underground
   d) They block clouds
   Answer: c) They allow rainwater to seep underground
10. Which of these is considered a non-forest product?
    a) Timber
    b) Latex
    c) Petroleum
    d) Gum
    Answer: c) Petroleum
11. The removal of the top canopy in a forest would first affect:
    a) Rainfall distribution
    b) Small animals in understory
    c) Quality of soil humus
    d) Flow of rivers
    Answer: b) Small animals in understory
12. The largest carbon storage in forests is present in:
    a) Fruits
    b) Soil and trees
    c) Leaves only
    d) Flowers
    Answer: b) Soil and trees
13. Which forest resource is used in making perfumes and medicines?
    a) Timber
    b) Resin
    c) Oxygen
    d) Fruits
    Answer: b) Resin
14. Forests help in regulating climate by:
    a) Reducing wind speed
    b) Controlling rainfall and temperature
    c) Stopping sunlight completely
    d) Only cooling the earth
    Answer: b) Controlling rainfall and temperature
15. If predators are removed from a forest, what is the immediate effect?
    a) Overgrazing by herbivores
    b) Increase in canopy size
    c) Fall in water levels
    d) More oxygen production
    Answer: a) Overgrazing by herbivores
16. Which process in forests adds nitrogen back into the soil?
    a) Photosynthesis
    b) Nitrogen fixation by bacteria
    c) Water absorption
    d) Decomposition of rocks
    Answer: b) Nitrogen fixation by bacteria
17. The presence of lichens in forests indicates:
    a) Soil richness
    b) Air purity
    c) Water pollution
    d) High temperature
    Answer: b) Air purity
18. Forest fires, though dangerous, also help by:
    a) Reducing oxygen
    b) Destroying soil
    c) Returning nutrients to the soil
    d) Killing all animals
    Answer: c) Returning nutrients to the soil
19. The symbiotic relation between fungi and roots of trees in forests is called:
    a) Mycorrhiza
    b) Parasitism
    c) Saprophytism
    d) Predation
    Answer: a) Mycorrhiza
20. Which forest product is directly linked with paper industry?
    a) Latex
    b) Pulpwood
    c) Resin
    d) Gum
    Answer: b) Pulpwood
21. The major difference between a natural forest and a plantation is:
    a) Plantations have diverse species
    b) Natural forests have less canopy
    c) Natural forests support higher biodiversity
    d) Plantations conserve soil better
    Answer: c) Natural forests support higher biodiversity
22. Which of the following forest animals is a primary consumer?
    a) Lion
    b) Tiger
    c) Deer
    d) Vulture
    Answer: c) Deer
23. The term “evergreen” in forests refers to:
    a) Trees that shed all leaves in summer
    b) Trees that remain green throughout the year
    c) Trees with needle-like leaves
    d) Trees that grow only in cold regions
    Answer: b) Trees that remain green throughout the year
24. In the forest ecosystem, the energy flow is always:
    a) Circular
    b) From herbivores to plants
    c) From producers to consumers
    d) Random
    Answer: c) From producers to consumers
25. The forest soil remains fertile mainly because of:
    a) Manure
    b) Artificial fertilizers
    c) Continuous decomposition of organic matter
    d) Washing away of minerals
    Answer: c) Continuous decomposition of organic matter
26. Which one of these is not a forest conservation practice?
    a) Afforestation
    b) Selective logging
    c) Poaching
    d) Social forestry
    Answer: c) Poaching
27. The canopy of trees in forests plays an important role in:
    a) Stopping sunlight from reaching earth
    b) Reducing impact of rainfall
    c) Making soil hard
    d) Storing seeds
    Answer: b) Reducing impact of rainfall
28. Which factor is most important for seed germination in dense forests?
    a) Amount of oxygen
    b) Availability of sunlight on forest floor
    c) Wind speed
    d) Noise of animals
    Answer: b) Availability of sunlight on forest floor
29. Forests act as a “carbon sink” because they:
    a) Release more CO₂
    b) Trap and store carbon dioxide
    c) Burn carbon compounds
    d) Absorb nitrogen
    Answer: b) Trap and store carbon dioxide
30. Which part of a forest ecosystem is called its “powerhouse”?
    a) Decomposers
    b) Producers (green plants)
    c) Consumers
    d) Soil microbes
    Answer: b) Producers (green plants)

Also Check:

• CBSE Class 7 Science MCQs
• CBSE Class 7 English MCQs
• CBSE Class 7 Maths MCQs
• CBSE Class 7 History MCQs

Forests: Our Lifeline Class 7 Summary

In this Chapter it stated that forest did not simply refer to trees but rather it is literally like a living organism where plants, animals, soil, and even minute microorganisms all require each other. The chapter informs us how forests are the lungs of the earth since they provide us with oxygen and also absorb carbon dioxide, making the air clean and balanced.

It further describes the role of forests in retaining rainwater, floods and soil erosion. In the absence of forests, land is dry and lifeless. The chapter demonstrates that each of the components of a forest big trees, small herbs, shrubs, animals, birds, insects, and decomposers plays an essential role. The dead leaves and animal waste would not be wasted either since they are recycled by the decomposers into the earth as nutrients.

Forests are also used to provide people with wood, fruits, medicines, and other products. Although, the chapter cautions us against the harmfulness of deforestation (deforestation). In case forests are lost, this will disrupt the natural state of things and negatively affect human beings and animals.

Thus, the key point of this chapter is the fact that forests are really our lifeline. In the absence of them, the earth would not have life.

Don't Miss: NCERT Solutions for Class 7 All Subjects (2025-26)