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DAV Class 7 Science Chapter 15 Question Answer Forests
DAV class 7 Science chapter 15 question answer Forests is given below. Here DAV class 7 Science book solutions is provided with great explanation.
Highlights
D. Answer the following questions in brief.
E. Answer the following questions.
A. Fill in the blanks.
1. Decomposers play an important role in ___________ of nutrients.
2. Herbs are found in the ___________ layer of the forest.
3. Forests maintain a balance between the amount of ___________ and ___________ gases in the atmosphere.
4. Overgrazing in forests may cause a decrease in soil ___________ and an increase in soil ___________.
5. ___________ is the national tree of India.
Answer: (1) recycling (2) understory (3) Oxygen, CO2 (4) fertility, erosion (5) Banyan
B. Write True or False for the following statements.
1. Forests depend on man for water and fertilisers.
2. The plants and animals, in a forest, are not dependent on one another.
3. Raw material, needed for making paper, is obtained from forests.
4. Forests help in decreasing soil erosion.
5. Forests play an important role in maintaining the water cycle in nature.
Answer: (1) False (2) False (3) True (4) True (5) True
C. Tick the correct option.
1. The layer of forest, where intertwined branches of trees are found, is known as the
Answer: canopy
2. Decomposers help in
Answer: recycling of nutrients
3. An increase in cutting down of the trees in forests will lead to
Answer: an increase in the amount of carbon dioxide in air.
4. The tree, that is thought of as an ‘immortal tree, is the
Answer: banyan tree
5. The tree that is often referred to as “The golden shower tree” is the
Answer: amaltas tree
D. Answer the following questions in brief.
1. Define the terms ‘food chain’ and ‘food web’.
Answer: Food chain: A linear chain showing relationship among prey and predator is called food chain. A food chain is composed of a producer, and one or more levels of consumers.
Food web: A food web is a network of many food chains. In the real world, we see food webs only.
2. Name the different layers of the forest.
Answer: Different layers of the forest are as follows:
- Forest floor layer
- Understory layer
- Canopy
- Emergent layer
3. Give the meaning of the term ‘soil erosion’.
Answer: Removal of topsoil by agents of weathering is called soil erosion.
4. Name four useful products that are provided to us by the forests.
Answer: four useful products that are provided to us by the forests are wood, paper, fruits and spices.
5. Name any four trees that are common to the Indian sub-continent.
Answer: Neem, Deodar, Sal and Ashoka.
E. Answer the following questions.
1. Comment on the statement: “Early man began his life as a forest dweller.”
Answer: Early man used to live in forests. He got his every need fulfilled by forests. He used to get fruits and meat for food from forests. He used leaves, wood and firewood for different purposes. Hence, it is correct to say that early man began his life as forest dweller.
2. How are the shapes of crowns of trees, and their location on earth, related to each other?
Answer: The shape of the crowns of trees has a lot to do with where it is located. If a tree is located nearer to the equator, then tall trees, with flat treetops (or crowns), are very common in this part of the world.
If a tree is located near the Arctic circle, the sun is never directly overhead and is usually quite low in the sky. Trees, in this part of the world, tend to be cone-shaped.
3. State any five points highlighting the importance of forests to mankind.
Answer: Five importance of forests to mankind are
- Forests maintain the ecological balance in nature.
- Forests are the habitat for the living organisms.
- Forests are reservoirs of oxygen.
- Forests help to maintain the balance of oxygen and carbon dioxide in nature.
- Forests prevent soil erosion, harvest rainwater naturally and maintain soil fertility.
- Forests provide us many useful products, such as wood, paper, fruits, spices, fuel, etc.
4. Discuss, in brief, the likely consequences of deforestation.
Answer: Deforestation leads to many harmful consequences. These include increase: in carbon dioxide level, extinction of plant and animal species, leading to floods and soil erosion.
5. How are the Eucalyptus tree, Teak tree and the Neem tree important for us?
Answer: The Eucalyptus tree, Teak tree and the Neem tree are important for us in these ways:
Eucalyptus is a tall evergreen tree. This tree is mainly used as the pulpwood in the manufacture of the paper.
Teak is one of the most popular trees of India. It is mainly used in the making of furniture and doors. Teak also has medicinal value. The bark is a bitter, health-giving tonic and is considered useful in fever.
Neem tree is popularly known as the Miracle Tree. It is a useful tree in rehabilitating the waste land areas. It also has good medicinal value.
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