Forests: Our Lifeline: Class 7 Science Q&A · Page 2
35 free answers on Forests: Our Lifeline (Science) for Class 7 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 7CBSE
Which among the following forest animals is the smallest? (a) Fox (b) Boar (c) Bison (d) Porcupine
Soln: The answer is (d) Porcupine
- ScienceClass 7CBSE
Boojho visited a forest near his town with his classmates and his teacher. As they were entering the forest, their class teacher told them not to make noise in the forest as noise could disturb the (a) birds (b) animals (c) both birds and animals (d) plants
Soln: Answer is (c) both birds and animals
- ScienceClass 7CBSE
Which of the following serve as green lungs? (a) The green pigment of the plants (b) Forests (c) Kitchen gardens (d) Greenhouse gases
Soln: Answer is (b) Forests Explanation: Plants release oxygen during photosynthesis which is used by all the organisms. Plants help to maintain the concentrations of CO2 and Oxygen. Hence they are called as green lungs.
- ScienceClass 7CBSE
Micro-organisms act upon the dead plants to produce (i) sand (ii) mushrooms (iii) humus (iv) wood
Solution: The answer is (iii) humus
- ScienceClass 7CBSE
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.
Solution: Statement (ii) Plants and animals in a forest are not dependent on one another.
- ScienceClass 7CBSE
Which of the following is not a forest product? (i) Gum (ii) Plywood (iii) Sealing wax (iv) Kerosene
Solution: The answer is (iv) Kerosene
- ScienceClass 7CBSE
Explain why there is a need for a variety of animals and plants in a forest.
Solution: A variety of plants and animals in the forests helps plants to regenerate and grow. A wide range of plants supports herbivores, which in turn serve as food for carnivores. Decomposers turn dead animals and plants into humus, thereby maintaining nutrient recycling. This wide variety makes the forest a dynamic living entity.
- ScienceClass 7CBSE
Why should we worry about the conditions and issues related to forests far from us?
Solution: We should worry about the forest for the following reasons: A decrease in forests results in an increase in carbon dioxide content in the atmosphere. This results in global warming. Depletion of forests results in soil erosion The decrease in forests adversely affects the lives of animals living in the forest. The absence of forests leads to flooding more often. Due to the reduction of forests, the land
- ScienceClass 7CBSE
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 ________.
Solution: (a) The insects, butterflies, honeybees and birds help flowering plants in pollination. (b) A forest is a purifier of air and water. (c) Herbs form the lowest layer in the forest. (d) The decaying leaves and animal droppings in a forest enrich the soil.
- ScienceClass 7CBSE
List five products we get from forests.
Solution: The five products we get from forests are listed below: i) Medicines ii) Spices iii) Wood iv) Paper v) Gum
- ScienceClass 7CBSE
Explain why there is no waste in a forest.
Solution: There is no waste in a forest because the waste created is bio-degradable, which gets converted to humus by the action of microorganisms.
- ScienceClass 7CBSE
Explain the role of forests in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Solution: Plants in the forests consume carbon dioxide and release oxygen through the photosynthesis process. This helps in balancing oxygen and carbon dioxide in the atmosphere.
- ScienceClass 7CBSE
What are decomposers? Name any two of them. What do they do in the forest?
Solution: The micro-organisms which convert dead plants and animals to humus are known as decomposers. For example, bacteria and fungi. They help in the recycling of nutrients by decomposing dead plants and animals.
- ScienceClass 7CBSE
Explain how forests prevent floods.
Solution: Plants in the forests will not allow the rainwater to fall directly on the earth, and these plants also hold water which helps in preventing floods.
- ScienceClass 7CBSE
Explain how animals dwelling in the forest help it grow and regenerate.
Solution: Animals dwelling in the forest help it grow and regenerate in the following ways: Animals help in dispersing plant seeds. Decaying animal dung provides nutrients for plants to grow Microorganisms convert the dead plants and animals to humus