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. The forest is extremely important because it provides us with the necessary products for our daily lives. Here are a few examples.
Forests provide us with various products such as firewood, timber, wood pulp, honey, lac, medicinal plants and herbs, raisins, biofertilizers, and so on. Forests also provide us with various raw materials for industrial use, fodder for animal feed, fuel, and fibres.
Download PDF of Class 7 Chemistry Worksheet on Chapter 17 Forests Our Lifeline – Set 1
CBSE Class 7 Chemistry Worksheet Chapter 17 Forests: Our Lifeline – Set 1
Q1. The branchy part of a tree above the stem is called ______.
a.) canopy
b.) hub
c.) crown
d.) shrub
Q2. Which of the following has a canopy?
a.) Tall trees
b.) Short tree
c.) Creepers
d.) Shrubs
Q3. Which of the following occurs due to deforestation?
a.) Floods
b.) Soil erosion
c.) Landslides
d.) All of the above
Q4. The micro-organisms which convert dead and decay matter are known as ______.
a.) herbivores
b.) carnivores
c.) decomposers
d.) scavengers
Q5. Which of the following will be affected most in the absence of decomposers?
a.) Animals
b.) Plants
c.) Insects
d.) All of the above
Q6. Fill in the blanks:
a.) Plants are ___ because they prepare their own food.
b.) ____ is the process of planting trees in large numbers.
c.) ____ gas is consumed during photosynthesis.
Q7. State true or false.
a.) Deforestation occurs due to overgrazing.
b.) Van Mahotsava is the celebration of planting saplings on a large scale
c.) Decomposers feed on dead animals.
Q8. Define scavengers.
Q9. How can you say that forests are valuable resources?
Q10. Explain how plants and animals help in maintaining the O2 – CO2 cycle.
Q11. Differentiate between autotrophs and heterotrophs.
Q12. What is deforestation?
Q13. Is it possible to build a food chain without a producer?
Q14. How does deforestation cause soil erosion?
Q15. How can we help in preserving forests?
Q16. How do trees grow in the forest without being harmed by humans? Explain.
Q17. What is the importance of forests?
Q18. What happens when after a certain period of time, the plants and animals die?
Q19. What will happen if forests disappear?
Q20. List the major functions of a tree’s crown in a forest.
Download PDF to access answers of the Chemistry Worksheet for Class 7 Chemistry Chapter 17 Forests: Our Lifeline Set – 1
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