Forests are essential to our survival. We are all dependent on forests in some way for survival. Forests provide us with clean air, food, medicines, and other resources such as wood, fodder, and other raw materials for industries. Forests help to keep the Earth stable by preventing soil erosion.
- Forests are critical to the survival of life on Earth.
- 80% of the world’s animal species rely on forests for survival.
- Forests are our planet’s lungs. It is critical in improving air quality.
- Forests are biodiversity hotspots. According to estimates, there are approximately three trillion trees on the planet.
- Forests are rich in medicinal plants, and approximately 60% of the medicines are made from them. There are plants that are 5000 years old.
Download PDF of Class 7 Chemistry Worksheet on Chapter 17 Forests: Our Lifeline – Set 2
CBSE Class 7 Chemistry Worksheet Chapter 17 Forests: Our Lifeline – Set 2
Q1. Leaves and branches are collectively known as ______.
a.) Crown
b.) Trunk
c.) Roots
d.) None of the above
Q2. Which of the following acts as decomposers?
a.) Fungi
b.) Vultures
c.) Bacteria
d.) Hyena
Q3. Plants release oxygen through the process called-
a.) Photosynthesis
b.) Respiration
c.) Transpiration
d.) None of the above
Q4. A dark-coloured substance decomposers convert is ______.
a.) Humus
b.) Soil
c.) Topsoil
d.) None of the above
Q5. The useful products from forests are ______.
a.) Wood
b.) Oil
c.) Spices
d.) All of the above
Q6. Fill in the blanks:
a.) ____ is a system made up of various plants, animals, and microorganisms.
b.) ____ make humus out of dead plants and animals.
c.) In nature, forests serve as a ____ and water purification system.
Q7. State true or false.
a.) Plants are called consumers.
b.) Deforestation is the planting of trees.
c.) Herbivores are the third step of the food chain.
Q8. Define ecosystem.
Q9. What is a canopy?
Q10. What happens when animals die in the forest?
Q11. List some uses of forests.
Q12. List factors which are responsible for the destruction of forests.
Q13. Why should forests be conserved?
Q14. How do forests prevent soil erosion?
Q15. Differentiate between scavengers and decomposers.
Q16. How does deforestation cause floods?
Q17. Explain how animals that live in forests help them grow and regenerate.
Q18. A forest acts as the purifier of air and water. Justify it.
Q19. How can deforestation be controlled?
Q20. Discuss the food supply chain in the forest.
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