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Test your Class 7 Science knowledge with 5 NCERT-based MCQs from the chapter Forests: Our Lifeline. Learn about forest products, decomposers, canopy, green lungs, and food chains.
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Chapter Information
- Class: 7
- Subject: Science
- Chapter: Forests: Our Lifeline
- Quiz Type: Multiple Choice Questions
- Total Questions: 5
Introduction
Forests are important natural ecosystems that support plants, animals, microorganisms, and human life. They provide useful products, maintain ecological balance, and contain interconnected food chains.
This quiz covers important concepts related to forest products, decomposers, canopy, the ecological importance of forests, and food chains.
What You Will Learn
After completing this quiz, you will revise:
- Common forest products
- Role of decomposers
- Meaning of canopy
- Importance of forests
- Food chains in an ecosystem
Why This Topic Is Important
Understanding forests helps students learn how different organisms depend on one another and how forests contribute to maintaining environmental balance.
Q1. The branchy and leafy part of a tree above the stem is known as:
A) Understorey
B) Canopy
C) Crown
D) Humus
Answer: Crown
Description for Exam:
The crown is the upper part of an individual tree that consists of its branches, twigs and leaves. It forms the leafy portion of the tree above the main stem.
The crown is the upper part of a tree, which includes branches and leaves above the main stem.
Key Points:
- It spreads out at the top of the tree
- Helps in capturing sunlight for photosynthesis
- Provides shade and shelter for birds and animals
Understanding:
The crown is important for making food because leaves are present in this part.
Example:
Large trees like mango or banyan have wide crowns.
Q2. Micro-organisms which convert dead plants and animals into humus are called:
A) Herbivores
B) Omnivores
C) Decomposers
D) Autotrophs
Answer: Decomposers
Description for Exam:
Decomposers break down dead plants and animals into simpler substances. This process helps form humus and returns nutrients to the soil.
Decomposers are micro-organisms that break down dead plants and animals into simpler substances.
Key Points:
- Convert dead matter into humus (rich organic soil)
- Help in recycling nutrients back into the soil
- Maintain balance in the ecosystem
Types of decomposers:
- Bacteria
- Fungi
Example:
Fungi growing on dead leaves help in decomposition.
Q3. Which of the following is not a forest product?
A) Plywood
B) Sealing wax
C) Kerosene
D) Gum
Answer: Kerosene
Description for Exam:
Kerosene is a petroleum product obtained from crude oil through refining. Plywood, gum, and lac/sealing wax are associated with forest resources or forest-based products.
Forest products are materials that we get directly from forests.
Common forest products:
- Gum (from trees)
- Plywood (from wood)
- Sealing wax (from plant sources)
Why kerosene is not a forest product:
- It is obtained from petroleum (fossil fuel), not from forests
Understanding:
Forest products come from plants or forest resources, not from underground fuels.
Q4. Forests are called the ______ of our planet.
A) Red veins
B) Blue heart
C) Green lungs
D) Brown skin
Answer: Green lungs
Description for Exam:
Forests are often described as the green lungs of the planet because plants take in carbon dioxide and release oxygen during photosynthesis. Forests also help maintain environmental balance.
Forests are called the “green lungs” because they help in maintaining the balance of gases in the atmosphere.
Key Functions:
- Absorb carbon dioxide
- Release oxygen during photosynthesis
- Help in reducing air pollution
Importance:
They support life by providing clean air and maintaining environmental balance.
Example:
Dense forests produce large amounts of oxygen, helping living beings survive.
Q5. The sequence of organisms eating one another is called:
A) Nitrogen cycle
B) Forest cycle
C) Food chain
D) Water cycle
Answer: Food chainDescription for Exam:
A food chain represents the transfer of food and energy from one organism to another through eating relationships. It generally begins with producers such as green plants
A food chain shows how energy passes from one organism to another through eating.
Key Points:
- Starts with producers (plants)
- Followed by consumers (animals)
- Ends with decomposers
Simple Structure:
Plant → Herbivore → Carnivore
Example:
Grass → Deer → Lion
Importance:
It shows the flow of energy and helps maintain balance in nature.
Related links
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-5
- Class 7 Maths Chapter 3 Data Handling part-5
- Class 7 Science Chapter 1 Nutrition in Plants part-4
- Class 7 English Chapter 1 The Rainbow part-2
- Class 7 Science Chapter 1 Nutrition in Plants part-3
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-4
- Class 7 Maths Chapter 3 Data Handling part-4
- Class 7 Social Science Chapter 1 Tracing Changes Through a Thousand Years part-3
- Class 7 Science Chapter 1 Nutrition in Plants part-3
- Class 7 Maths Chapter 3 Data Handling part-3
- Class 7 English Chapter 1 The Rainbow part-1
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