DAV Class 3 Science Chapter 4 Importance of Plants solutions from DAV textbook My Living World. Here you will find comprehensive question answers, benefits of plants, ways to conserve plants (afforestation and Van Mahotsav), and authentic DAV book illustrations.
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Chapter Overview: Importance of Plants (Class 3 Science)
Plants are indispensable for all living beings on planet Earth. They give us oxygen to breathe, delicious food, wood for shelter, medicines to cure diseases, and cotton for clothes. They also absorb harmful carbon dioxide, acting as giant natural air purifiers.
A. Fill in the blanks.
1. Plants give us oxygen gas for breathing.
Explanation: Plants release oxygen during daytime photosynthesis, which all animals and humans need to stay alive.
2. People who cut down trees should be punished.
Explanation: Illegal tree felling destroys habitats and disrupts climate stability.
3. Planting of new trees is called afforestation.
Explanation: Afforestation means establishing forests by planting large numbers of saplings.
4. Deforestation should be banned / stopped.
Explanation: Indiscriminate cutting of trees leads to soil erosion and loss of rainfall.
5. We celebrate Van Mahotsav by planting saplings.
Explanation: Van Mahotsav is an annual tree-planting festival celebrated across India in July.
B. Write True or False for the following statements.
1. Plants give out carbon dioxide during daytime. — False
Reason: During daytime, plants take in carbon dioxide and give out oxygen during photosynthesis.
2. We get rubber from plants. — True
Reason: Latex sap from rubber trees is processed into tyres, erasers, and elastic bands.
3. Cutting down trees is called afforestation. — False
Reason: Cutting down trees is called deforestation; planting trees is called afforestation.
4. Plants purify the air. — True
Reason: Plants absorb polluting carbon dioxide and release fresh, clean oxygen.
C. Tick the correct option.
1. They are known as air purifiers.
(a) animals
(b) humans
(c) plants
(d) vehicles
Answer: (c) plants
Explanation: Plants trap dust, consume excess carbon dioxide, and release fresh oxygen.
2. We get wood from—
(a) herbs
(b) shrubs
(c) trees
(d) climbers
Answer: (c) trees
Explanation: Large trees like teak, sal, and pine have thick woody trunks that produce timber for furniture.
3. It is celebrated to promote planting of trees.
(a) Diwali
(b) Holi
(c) Van Mahotsav
(d) Eid
Answer: (c) Van Mahotsav
Explanation: Van Mahotsav is the festival of tree planting celebrated every monsoon season.
D. Answer the following questions in brief.
Question 1: Name any four things that we get from plants.
Answer: Four important things we get from plants are:
- Food (cereals, pulses, fruits, and vegetables)
- Oxygen gas for breathing
- Wood / Timber for making tables, chairs, and doors
- Medicines (neem, tulsi, and ginger)
Question 2: What is afforestation?
Answer: Afforestation is the process of planting a large number of new trees and saplings on bare or empty land to create green forests.
Question 3: How do plants help in purifying air?
Answer: During daytime photosynthesis, plants absorb harmful carbon dioxide gas from the atmosphere and release fresh, clean oxygen. Their roots also bind soil and prevent dust from blowing into the air.
Question 4: What is deforestation?
Answer: Deforestation is the large-scale cutting down or clearing of trees and forests by humans for building houses, factories, and roads.
E. Answer the following questions.
Question 1: Write any four uses of plants.
Answer:
| Need / Purpose | Contribution of Plants | Common Examples |
|---|---|---|
| Breathing & Life | Supplies Oxygen gas for all living organisms | All green leafy trees during daytime |
| Nutrition & Food | Provides cereals, pulses, vegetables, fruits, spices | Wheat, Rice, Apple, Potato, Pepper |
| Health & Healing | Supplies natural medicines and healing herbs | Tulsi (cough), Neem (skin), Garlic |
| Clothing & Shelter | Gives cotton fiber for clothes and timber for homes | Cotton plant, Teak, Sheesham wood |
Question 2: Why are plants called “Air Purifiers”?
Answer: Vehicles, factories, and living creatures release carbon dioxide into the air. Green plants absorb this carbon dioxide through tiny leaf pores (stomata) and use it to make food during sunlight hours. In exchange, they release fresh oxygen into the air. In this way, plants filter and cleanse our atmosphere naturally, earning the title of nature’s air purifiers.
Question 3: Suggest any three ways to conserve plants.
Answer:
- 1. Practice Afforestation: Plant saplings in schools, parks, and along roadsides, especially during Van Mahotsav.
- 2. Stop Deforestation: Strictly ban the indiscriminate cutting of green trees and punish illegal loggers.
- 3. Use Fallen Branches: Collect only dry, fallen branches for firewood rather than chopping living branches.
Value Based Question
The students of Class 3 decided to adopt a tree each in their school neighborhood. They promised to water their adopted trees regularly, remove weeds around the roots, and ensure animals do not harm the young saplings.
Question: What message does this initiative give to society?
Answer: It teaches that caring for nature is everyone’s responsibility. When young children adopt trees, they build an emotional bond with the environment and help ensure a cleaner, greener planet for tomorrow.
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