Important Questions for CBSE Class 7 Science Chapter 17 - Forests: Our Lifeline

Very Short Answer Questions: 1 Mark

1. ______________ act as green lungs 

a) Forests b) Industries c) Air d) Rivers

Ans: a) Forest

2. Give an example of how animals alert each other to the presence of danger.

Ans: Animals communicate with one another by producing sounds, moving to higher and safer terrain, and so on.

3. Name some animals that live deep within the forest.

Ans: Boar, bison, jackal, porcupine, elephant, tiger, lion, etc.

4. Name some forest trees.

Ans: Sal, Sheesham, Fig, Teak, Bamboo, Neem, Amla, etc.

5. Match the following.

Ans: 1. (c), 2. (A), 3. (E), 4. (b), 5. (d).

6. Define the crown of a tree.

Ans: The crown is the branch-like region of the tree above the stem.

7. Define canopy.

Ans: The canopy is the roof-like structure formed by the branches of big trees over the other plants in the forest.

8. What are decomposers?

Ans: Decomposers are microbes that turn dead plants and animals into humus.

9. Forests are a static living community. State whether true or false.

Ans: False. Forests are a dynamic living entity undergoing lots of changes and activities.

10. ____________ traps the rain water in the forests and allows it to seep downward.

Ans: Canopy

Short Answer Questions: 3 Marks

11. Why is the canopy not uniformly green?

Ans: The leaves of all the tree branches that make up the crown and canopy will be different colours. The leaves may also be in various states of ageing and yellowing, resulting in a forest canopy that is not evenly green.

12. Why should we not go deep inside the forest?

Ans: Wild animals tend to hide further into the forest, away from human habitation. Deep woods, on the other hand, are less damaged by human activity. As a result, we should not travel deep into the forest to avoid harming ourselves or the forest.

13. What are understories? How are they formed?

Ans: The understorey is the layer of plants and trees that grows beneath the forest's main canopy. The differences in height, size, and shape of the crowns of different plants create different understories.

14. What is the forest floor? State its importance.

Ans: In a forest, it is a layer that is just above the soil surface. It is made up of shed and dead leaves, branches, twigs, barks, and stems that are in various states of decomposition. The decomposition of the forest floor produces humus, which boosts the soil's fertility.

15. Define humus. How is it formed?

Ans: Humus is a dark-colored fluid found in the topsoil that is generated by microbes decomposing organic debris such as dead plant and animal remains.

Long Answer Questions: 5 Marks

16. Explain the role of forests.

Ans: Forests are nature's green lungs. They clean the air and provide oxygen to the environment. The tree roots prevent soil erosion, which in turn prevents floods. They also protect and improve the soil's fertility. Many organisms call forests home. They play an essential role in the ecology. Forests also provide us with a variety of useful items such as lumber, honey, medicinal plants, and so on. Forest also helps in rainfall.

17. Explain the importance of a food chain with examples.

Ans: A food chain is a series of organisms that consume and are eaten. An organism consumes the previous member of the food chain before being consumed by the subsequent member. 

For Example: Grass 🡪 Deer 🡪 Lion.

The food chain is vital because it provides food for the creatures. Many food chains can be found in woods, all of which are interconnected. These food networks aid in the maintenance of forest balance. As an outcome, if one of the components is harmed, the rest of the food chain is harmed as well.

18. Explain how forests influence the water cycle.

Ans: Evaporation allows plants and trees to take water from the soil and release it into the atmosphere. This evaporating water condenses into clouds, which ultimately rains. In forests, a large number of trees can be found in a small area. As a result, more water is absorbed by the soil and released into the atmosphere. As a result, rainfall increases. As a response, more water seeps into the forest floor and soil, raising groundwater levels.

19. How do forests balance the amount of oxygen and carbon dioxide in the atmosphere?

Ans: During photosynthesis, trees' green leaves take carbon dioxide from the atmosphere and emit oxygen. This oxygen is necessary for animal respiration. The carbon dioxide emitted by the animals is absorbed by plants and trees. As a result, the green plants in the forests maintain the oxygen-carbon dioxide equilibrium.

20. What is the effect of rapid urbanisation on forests?

Ans: Rapid urbanisation results in widespread deforestation to provide land and materials for housing and industrial reasons. Deforestation throws off the oxygen-carbon dioxide equilibrium. As a result, global warming occurs. As cities become more densely populated, pollution of the air, water, and soil grows, further degrading forests. Flooding and soil erosion are becoming more frequent. Forest destruction affects the habitats of many plants and animals, putting them in risk of becoming endangered or extinct. Rapid urbanisation will also increase forest exploitation for forest products, negatively impacting the health of forests and its constituents.

What are the Benefits of Important Questions from Vedantu for Class 7 Science Chapter 17 - Forests: Our Lifeline

Embark on an insightful journey through Vedantu’s Important Questions for Class 7 Science Chapter 17 - "Forests: Our Lifeline." These questions act as guiding beacons, navigating students through the fascinating world of forests and their vital role in sustaining life.

1. Conceptual Focus: Pinpoint key topics within the chapter, ensuring an efficient and focused study session on the critical aspects of forests as life's essential support.

2. Exam Preparedness: Equip students for exams by aligning questions with the vital elements of forest ecosystems, reducing stress, and fostering confidence in understanding their significance.

3. Fundamental Reinforcement: Strengthen the grasp of fundamental concepts related to forests, ensuring a solid foundation for further learning about their role as essential lifelines.

4. Time-Effective Learning: Learn effective time management by practicing questions that emphasize essential topics, enabling efficient study sessions and optimal exam preparation for the chapter.

5. Self-Assessment: Facilitate self-assessment and progress tracking, allowing students to gauge their understanding of the crucial concepts related to forests as vital resources.

6. Strategic Approach: Adopt a strategic approach for higher scores by focusing on crucial topics and practicing questions that align with the chapter's core principles of forests being lifelines.

7. Comprehensive Coverage: Cover a wide range of topics within the chapter, ensuring a holistic understanding of the significance and challenges related to forests, emphasizing their role as essential resources.

8. Confidence-Boosting Preparation: Approach exams with confidence, as these questions serve as strategic tools supporting students in mastering the complexities of forests as indispensable lifelines for our planet.

Conclusion

Reviewing all the crucial questions for Class 7 Science Chapter 17 - Forests: Our Lifeline provides students with a solid grasp of the chapter's topics. The extra and important questions for Class 7 Science Chapter 17 - Forests: Our Lifeline, engage in a concept-focused discussion, encompassing all chapter themes. This question-and-answer method proves time-saving during exam prep, offering an efficient way to revise the chapter and enhance understanding. Practicing these important questions streamlines preparation and boosts confidence for the upcoming exams.