Explain how forests prevent floods.

Ans. Forest acts as a natural absorber of water. It allows rainwater to seep through. In theabsence of trees, the rainwater would hit the ground directly resulting in a flood.However, because of the presence of trees, rainwater does not hit the ground directly.It rather hits the ground slowly. Hence, before flooding, all the rainwater seeps through the ground. In this way, forests prevent floods. Q3. What are decomposers? Name any two of them. What do they do in the forest? Ans. Decomposers are micro-organisms that convert the dead plants and animals to humus.Bacteria and fungi are the two types of decomposers.They help in the process of recycling of nutrients by decomposing various deadorganisms such as plants and animals to form humus. Ans. Forests are called the green lungs. This is because plants in forests release oxygenthrough the process of photosynthesis and help in providing oxygen to animals forrespiration. Plants consume carbon dioxide released by the animals. In this way, plantshelp in maintaining a balance of oxygen and carbon dioxide in the atmosphere. Ans. There is no waste in a forest because micro-organisms act on the wastes and convertthem to humus. This humus ensures that the nutrients are returned back to the soil. Q6. List five products we get from forests. Ans. We get wooden items like plywood, fuelwood, boxes, paper, matchsticks, and furniture form forests. In addition, gum, oils, spices, fodder for animals, and medicines are also obtained from fores...

These Forests: Our Lifeline NCERT Solutions for Class 7 Science Chapter 17 Class 7 Science Chapter 17 Forests: Our Lifeline Textbook Exercise Questions and Answers Question 1. Explain how animals dwelling in the forest help it grow and regenerate. Answer: Animals which live in the forest help it grow and regenerate in following ways: • By eating vegetation, they clear the land for fresh growth. • Animals help flowering plants in pollination and seed dispersal. • Dead remains of animals make humus after decomposition. This increases soil fertility. Question 2. Explain how forests prevent floods. Answer: Forest acts as a natural absorber of rainwater and allows it to seep underground. It helps in controlling the flow of water and slows it down which helps in preventing floods. Also, the trees present in the forest prevents the rain from directly hitting the ground and bind the soil together which helps in absorption of the rainwater and thus prevent flood. Question 3. What are decomposers? Name any two of them. What do they do in the forest? Answer: The organisms which decompose the dead remains of plants and animals are called decomposers. Fungi and bacteria are examples of decomposers. They clear the debris of dead remains and convert them into humus which enriches the topsoil. Question 4. Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere. Answer: Forests are called the green lungs. This is because plants in forests r...

Class 7 Science Chapter 17 | Forests : Our Lifeline NCERT Solutions Question 1. Explain how animals dwelling in the forest help it grow and regenerate. Answer 1 Animals work as the cleaning agents in the forest. Microorganisms convert dead plants and animals into humus which is rich in nutrients. 2) Animals help in dispersal of seeds from one part of the forest to other part. 3) Herbivores helps the carnivores to grow as they serve as food for them. 4) Animals excreta and their dead bodies when decomposed into soil act as manures for soil. Question 2. Explain how forests prevent floods. Answer 2 Forests act as natural absorber of rainwater and allows it to seep. The roots of the trees absorb the water and prevent it from flowing away. Roots of trees also help in percolation of water into the soil. This helps in preventing floods. Question 3. What are decomposers? Name any two of them. What do they do in the forest? Answer 3 Decomposers are the micro-organism which convert the dead plants and animals to humus are called decomposers. Example: Fungi and bacteria. They clean the forests decaying dead bodies and replenishing the nutrients back to the forest soil. Decomposers recycle and convert dead matter into humus which mixes with soil and provide nutrients to plants. Question 4. Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere. Answer 4 Forest works like a self-sustaining system. Plants release oxygen in the atmospher...

Q 1. Explain how animals dwelling in the forest help it grow and regenerate. SOLUTION: Various types of animals (herbivores, carnivores) live in a forest and help the forest to grow and regenerate in the following ways: (i) Animals help in pollination of flowers i.e., transfer of pollen grains from the anther of one flower to the stigma of another flower. (ii) Animals help in dispersal of seeds of plants to long distances. (iii) Animal excreta (or droppings) and their dead bodies are acted upon by microbes and are converted into nutrients. These nutrients are released into the soil and are absorbed by plant roots. In this way, animals provide nutrients for plant growth. Q 2. Explain how forests prevent floods. SOLUTION: Forests act as natural absorbers of rainwater and allow it to seep in the ground. In the absence of trees, rainwater would hit the ground directly resulting in floods. However, in a forest, raindrops do not hit the forest floor directly. The canopy layer of the forest intercepts the flow of raindrops so that most of the rain water comes down through the branches, stems and leaves of the trees. Thus, water does not collect and stagnate on the forest floor. This prevents flooding. Q 3. What are decomposers? Name any two of them. What do they do in the forest? SOLUTION: Decomposers are the microorganisms which feed on dead remains of plants and animals and convert it into nutrient rich humus. Bacteria and fungi are the examples of decomposers. Decomposers carr...

Board CBSE Textbook NCERT Class Class 7 Subject Science Chapter Chapter 17 Chapter Name Forests: Our Lifeline Number of Questions Solved 13 Category NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline Question 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 provides nutrients to the seedling to grow. This is how animals help the forest to grow and regenerate. Question 2. Explain how forests prevent floods. Answer: Raindrops in a forest do not hit the ground directly. The uppermost layer of the forest canopy intercepts the raindrops, and most of the water comes down up to soil through the branches and the stems of the trees. From the leaves, it drops slowly over the branches of the shrubs and herbs. Thus forests act as a natural absorber of rainwater and allow it to seep and therefore help in controlling floods. Question 3. What are decomposers? Name any two of them. What do they do in the forest? Answer: The micro-organisms which convert the dead plants and animals to humus are known as decomposers. Bacteria, mushrooms, etc. are decomposers. They decompose dead organisms and provide nutrients to trees. Question 4. Explain the role of forests in maintaining the balance between oxygen and carbon dioxide in the atmosphere. Answer: Plants release oxygen as a byproduct during the process of photosynthesis. This oxygen is inhaled by animals for re...

Floods: • Rainwater is naturally absorbed by forests, allowing it to seep into the soil. • It aids in the preservation of the water table. • The soil will not hold water if trees are not present, resulting in flooding. • Trees not only provide food for other organisms but also provide protection and support to a variety of animals, including humans. • After heavy rains, trees reduce the risk of flooding. • Forests not only help in flood management, but they also aid in maintaining the flow of water in waterways so that we have a constant supply of water. • The roots of plants reach deep into the soil as they grow, creating space between the soil particles. • When it rains in the mountains, the runoff water is absorbed by the plant's root systems. • Due to this, the possibility of flooding is considerably reduced. • On the other hand, in areas where there are no trees, the rain will reach the ground immediately and will flood the area surrounding it. • Heavy rain will also affect the soil.

Class 7 Science Chapter 17 | Forests : Our Lifeline NCERT Solutions Question 1. Explain how animals dwelling in the forest help it grow and regenerate. Answer 1 Animals work as the cleaning agents in the forest. Microorganisms convert dead plants and animals into humus which is rich in nutrients. 2) Animals help in dispersal of seeds from one part of the forest to other part. 3) Herbivores helps the carnivores to grow as they serve as food for them. 4) Animals excreta and their dead bodies when decomposed into soil act as manures for soil. Question 2. Explain how forests prevent floods. Answer 2 Forests act as natural absorber of rainwater and allows it to seep. The roots of the trees absorb the water and prevent it from flowing away. Roots of trees also help in percolation of water into the soil. This helps in preventing floods. Question 3. What are decomposers? Name any two of them. What do they do in the forest? Answer 3 Decomposers are the micro-organism which convert the dead plants and animals to humus are called decomposers. Example: Fungi and bacteria. They clean the forests decaying dead bodies and replenishing the nutrients back to the forest soil. Decomposers recycle and convert dead matter into humus which mixes with soil and provide nutrients to plants. Question 4. Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere. Answer 4 Forest works like a self-sustaining system. Plants release oxygen in the atmospher...

Ans. Forest acts as a natural absorber of water. It allows rainwater to seep through. In theabsence of trees, the rainwater would hit the ground directly resulting in a flood.However, because of the presence of trees, rainwater does not hit the ground directly.It rather hits the ground slowly. Hence, before flooding, all the rainwater seeps through the ground. In this way, forests prevent floods. Q3. What are decomposers? Name any two of them. What do they do in the forest? Ans. Decomposers are micro-organisms that convert the dead plants and animals to humus.Bacteria and fungi are the two types of decomposers.They help in the process of recycling of nutrients by decomposing various deadorganisms such as plants and animals to form humus. Ans. Forests are called the green lungs. This is because plants in forests release oxygenthrough the process of photosynthesis and help in providing oxygen to animals forrespiration. Plants consume carbon dioxide released by the animals. In this way, plantshelp in maintaining a balance of oxygen and carbon dioxide in the atmosphere. Ans. There is no waste in a forest because micro-organisms act on the wastes and convertthem to humus. This humus ensures that the nutrients are returned back to the soil. Q6. List five products we get from forests. Ans. We get wooden items like plywood, fuelwood, boxes, paper, matchsticks, and furniture form forests. In addition, gum, oils, spices, fodder for animals, and medicines are also obtained from fores...

Floods: • Rainwater is naturally absorbed by forests, allowing it to seep into the soil. • It aids in the preservation of the water table. • The soil will not hold water if trees are not present, resulting in flooding. • Trees not only provide food for other organisms but also provide protection and support to a variety of animals, including humans. • After heavy rains, trees reduce the risk of flooding. • Forests not only help in flood management, but they also aid in maintaining the flow of water in waterways so that we have a constant supply of water. • The roots of plants reach deep into the soil as they grow, creating space between the soil particles. • When it rains in the mountains, the runoff water is absorbed by the plant's root systems. • Due to this, the possibility of flooding is considerably reduced. • On the other hand, in areas where there are no trees, the rain will reach the ground immediately and will flood the area surrounding it. • Heavy rain will also affect the soil.

Board CBSE Textbook NCERT Class Class 7 Subject Science Chapter Chapter 17 Chapter Name Forests: Our Lifeline Number of Questions Solved 13 Category NCERT Solutions for Class 7 Science Chapter 17 Forests: Our Lifeline Question 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 provides nutrients to the seedling to grow. This is how animals help the forest to grow and regenerate. Question 2. Explain how forests prevent floods. Answer: Raindrops in a forest do not hit the ground directly. The uppermost layer of the forest canopy intercepts the raindrops, and most of the water comes down up to soil through the branches and the stems of the trees. From the leaves, it drops slowly over the branches of the shrubs and herbs. Thus forests act as a natural absorber of rainwater and allow it to seep and therefore help in controlling floods. Question 3. What are decomposers? Name any two of them. What do they do in the forest? Answer: The micro-organisms which convert the dead plants and animals to humus are known as decomposers. Bacteria, mushrooms, etc. are decomposers. They decompose dead organisms and provide nutrients to trees. Question 4. Explain the role of forests in maintaining the balance between oxygen and carbon dioxide in the atmosphere. Answer: Plants release oxygen as a byproduct during the process of photosynthesis. This oxygen is inhaled by animals for re...