NCERT Solutions Class 7 Science Chapter 12 - Forests: Our Lifeline

The NCERT solutions class 7 science chapter 12 forests our lifeline contains solutions to all the exercises in the chapter to make it easier for students to grasp how valuable forests are to our environment. In forests our lifeline class 7 chapter students will  discuss how forests are important in balancing the ecosystem through supplying oxygen, absorbing carbon dioxide and housing species. 

By solving class 7 science chapter 17 question answer, students understand that forests serve as biomes for different Living organisms, and the regulation of Oxygen and Carbon dioxide in the atmosphere. Forests our lifeline class 7 solutions assist in laying down a good understanding of key topics, giving confidence for exams. They lead to better retention because they break down difficult concepts which makes revising much easier and faster. Further, NCERT Solutions for Class 7 Science are aligned to the NCERT syllabus and exam patterns to enable the students get better grades by offering correct and summarized answers.

1.0Download Class 7 Science Chapter 12 NCERT Solutions PDF Online

Students can find the ncert solutions class 7 science chapter 12 pdf from the table above, which can be downloaded so that students can practice with these anytime and anywhere they want.

2.0What Will Students Learn in Chapter 12: Forests Our Lifeline?

• The role of forests in preserving the balance in the global ecosystem.
• The mutual relationship between plant and animal life and microbes in forest enterprise.
• Primary activities such as sediment transportation by water, water cycle, distribution of nutrients and decomposer organisms.
• Why forests play a role in oxygen supply and climate change.
• Deforestation consequences, benefits of forest protection.
• Potential loss of forests as homes to many species, and the significance of forest ecosystem Diversity for supporting life.

3.0NCERT Questions with Solutions for Class 7 Science Chapter 12 - Detailed Solutions

• Explain how animals dwelling in the forest help it grow and regenerate. Ans. The animals like herbivores, carnivores and micro-organisms, etc play an important role in maintaining the food chains. (i) Micro-organisms convert the dead plants and animals to humus. This humus helps in returning the nutrients back to the soil. These are absorbed by plants. (ii) The animals also help in dispersing the seeds of certain plants. (iii) The decaying animal dung provides nutrients to various types of seedlings to grow. All these activities of animals and microorganisms help the forest to grow and regenerate.
• Explain how forest prevent floods. Ans. Forest acts as a natural absorber of water. It allows rainwater to seep down through the soil. In the absence of trees, the rainwater would hit the ground directly resulting in 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.
• 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 dead organisms such as plants and animals to form humus.
• Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere. Ans. Forests are called the green lungs. This is because plants in forest release oxygen through the process of photosynthesis and help in providing oxygen to animals for respiration. Plants consume carbon dioxide released by the animals. In this way, plants help in maintaining a balance of oxygen and carbon dioxide in atmosphere.

• Explain why there is no waste in a forest. Ans. There is no waste in a forest because micro-organisms act on the wastes and convert them to humus. This humus ensures that the nutrients are returned back to the soil.
• List five products we get from forests. Ans. (i) Fruits and vegetables (ii) Timber and wood (iii) Latex (rubber raw product) (iv) Spices, resin, gum (v) Medicines and herbs
• Fill in the blanks: (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 ______. Ans. (a) pollination (b) air and water (c) lowest (d) fertility
• Why should we worry about the conditions and issues related to forests far from us? Ans. There are various reasons for which we should be vigilant about matters related to forests. (i) A decrease in forest area would lead to an increase in carbon dioxide in air. This will lead to an increase of earth's temperature. (ii) Soil erosion would occur if there were no forests. (iii) Floods would be more frequent in absence of forests. (iv) Forests provide shelter and food to animals. When forests are adversely affected, the habitats of wild animals are also adversely affected. Therefore, we need to conserve our forests.
• Explain why there is a need of variety of animals and plants in a forest. Ans. A greater variety of plants and animals in the forests helps it to regenerate and grow. Greater variety of plants means more food and habitat for the herbivores. An increase in herbivores means more food for carnivores. Decomposers help to maintain the supply of nutrients to the soil and to the growing plants. This wide variety makes forest a dynamic living entity.
• In figure, 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 Ans.

• Which of the following is not a forest product? (i) Gum (ii) Plywood (iii) Sealing wax (iv) Kerosene Ans. Kerosene
• Which of the following statements is not correct? (i) Forests protect the soil from erosion. (ii) Plants and animals in a forest are not dependent on one another. (iii) Forests influence the climate and water cycle. (iv) Soil helps forests to grow and regenerate. Ans. Plants and animals in a forest are not dependent on one another.
• Micro-organisms act upon the dead plants to produce (i) sand (ii) mushrooms (iii) humus (iv) wood Ans. Humus