Forest is an important chapter in Class 7 science. It discusses the importance of forests, soil erosion, its causes, the importance of trees for mankind etc. We have given the DAV Class 7 Science Chapter 15 solutions with explanations.
DAV Class 7 Science Chapter 15 Solutions
DAV class 7 Science Forests Question answers are given below.
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
Also Check: DAV Class 7 Science Chapter 10 Solutions
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: Amaltaas tree
D. Answer the following questions in brief.
1. Define the terms ‘food chain’ and ‘food web’.
Answer: Food chain: A linear chain representing the relationship between prey and predator is called a food chain. A food chain starts from the producers and ends in decomposers. It also shows the transfer of energy and nutrients from one organism to another.
Food web: A food web comprises of various food chains. It is a network of interrelated food chains.
2. Name the different layers of the forest.
Answer: Different layers of the forest are as follows:
- Forest floor layer
- Emergent layer
- Understory layer
- Canopy
Also Check: Reproduction in Plants Question Answers DAV Class 7 Science
3. Give the meaning of the term ‘soil erosion’.
Answer: Soil erosion is the removal of the top layer of soil by different agents. The different agents can be wind, snow and water.
4. Name four useful products that are provided to us by the forests.
Answer: The 4 useful products we get from the forests are wood for making furniture, paper for making books and notebooks, fruits to eat and spices.
5. Name any four trees that are common to the Indian sub-continent.
Answer:
Indian Mahagony
Gulmohar Tree
Ashoka Tree
Peepal Tree
Banyan Tree
DAV Class 7 Science Chapter 15 Solutions | Part E
E. Answer the following questions.
1. Comment on the statement: “Early man began his life as a forest dweller.”
Answer: Early man began his life as a forest dweller. Early man was totally dependent on the forests for all his needs. He used to make sharp tools to hunt animals. He used to eat fruits from the trees in the forest. He used to stay all the time in forests. He used to wear the skin of animals after hunting them. So, he used to dwell in the forest.
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 the tree is dependent on their location on the earth. The trees located near the equator have flat-shaped crowns. They receive more amount of heat.
If the tree lies on the Arctic circle, the sun’s rays will never be overhead on them. The crown of trees of this area will be cone-shaped.
3. State any five points highlighting the importance of forests to mankind.
Answer: Importance of Forests for mankind:
Forests are habitats to a large species of plants and animals
Forests provide us with wood for making furniture for homes
We get hundreds of herbs from the forests that are used in the treatment of various diseases
We get paper from the forests for making books and notebooks.
Forests maintain an ecological balance of nature.
4. Discuss, in brief, the likely consequences of deforestation.
Answer: Forests are a rich source of herbs. They are habitat to a large species of plants and animals. If we keep on clearing them more floods will occur, more animals will become extinct and will become homeless. Deforestation will also increase soil erosion and the levels of carbon dioxide on earth will also increase.
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. We get the pulpwood for making paper from the Eucalyptus tree.
Neem Neem tree is used for various purposes. It has an excellent medicinal value, especially in the Indian culture.
Teak trees are popular in India. We get the wood to make furniture from the teak trees. These trees also have medicinal value just like the neem tree.
So, these were DAV Class 7 Science Chapter 15 Solutions. If you have any queries in the Forests Question Answers, feel free to ask me through the comments section below. If you wish to score excellent marks in your school exams fill up the form below for taking online or offline classes from Subject experts.
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