17. Forests: Our Lifeline Class 7 Science [LATEST] Solutions NCERT Exercise in English - CBSE Study
NCERT Solutions for Class 7 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 17. Forests: Our Lifeline with detailed explanations and step-by-step answers for better exam preparation. Each NCERT Exercise is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 7 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 7 English Medium Science All Chapters:
17. Forests: Our Lifeline
2. NCERT Exercise
Exercise
1. Explain how animals dwelling in the forest help it grow and regenerate.
Answer:
Animals help in dispersing seeds of certain plants. The decaying animal dung also privides nutrients to the seedling to grow. This is how animals help the forest to grow and regenerate.
2. Explain how forests prevent floods.
Answer:
Plants act as a natrual observer of rainwater and allow water to seep slowly to recharge ground water. This is how forest help preventing flood.
3. What are decomposers? Name any two of them. What do they do in the forest?
Answer:
The micro-organism which convert the dead plants and animals to humus are known as decomposers. Bacteria, mushroom, etc. are and provide nutrient to trees.
4. Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Answer:
Plants take in carbon-die- oxide and release oxygen in the process of photosynthesis. Thus, they maintain the balance of oxygen and carbon-dioxide in the atmosphere.
5. Explain why there is no waste in a forest.
Answer:
The decomposers decompose the dead organisms. The decomposed matter is absorbed by plants as nutrients. So, there is no waste in forests.
6. List five products we get from forests? Keywords Canopy Crown Decomposers Seed dispersal Soil erosion Understorey Deforestation Humus Regeneration.
Answer:
Wood, medicine, spice, fodder. and honey.
7. Fill in the blank:
(a) The insects, butterflies, honeybees and birds help flowering plants in .
(b) A forest is a purifier of and .
(c) Herbs form the layer in the forest.
(d) The decaying leaves and animal droppings in a forest enrich the .
Answer:
(a) pollination, (b) water, air (c) ground (d) soil.
8. Why should we worry about the conditions and issues related to forests far from us?
Answer:
Forests are very helpful for us. They clean air, play a vital role in water cycle, provide variious items and so on. So, we should worry about the conditions and issues related to forests far from us.
9. Explain why there is a need of variety of animals and plants in a forest.
Answer:
(i) Variety of animals are necessary for their survival and maintainance of food chain.
(ii) For example: grass is eaten by insects, which in turn, is eaten by frog.
(iii) The frog is consumed by snakes which is eaten by eagles.Thus, it is made a food chain:
Grass - insects - frog - snake - eagle
Many food chain can be found in the forest. All food chains are linked. If any one food chain is distrubed, It effects other food chains. Every part of the forest is depandet on each other parts. If we remove one component, say trees, all other components would be affected.
10. In Fig. 17.15, the artist has forgotten to put the labels and directions on the arrows. Mark the directions on the arrows and label the diagram using the following labels: clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, water table.
11. Which of the following is not a forest product?
(i) Gum
(ii) Plywood
(iii) Sealing wax
(iv) Kerosene
Answer:
(iv) Kerosene
12. Which of the following statements is not correct?
(i) Forests protect the soil from erosion.
(ii) Plants and animals in a forest are not depedent on one another.
(iii) Forests influence the climate and water cycle.
(iv) Soil helps forests to grow and regenerate
Answer:
(ii) Plants and animals in a forest are not dependent on one another.
13. Micro-organism act upon the dead plants to produce.
(i) Sand
(ii) Mushroom
(iii)Humus
(iv) Wood
Answer:
(iii) Humus.
Topic Lists: