NCERT Solutions Class 10 Science Chapter 15 Our Environment – Here are all the NCERT solutions for Class 10 Science Chapter 15. This solution contains questions, answers, images, explanations of the complete Chapter 15 titled Our Environment of Science taught in class 10. If you are a student of class 10 who is using NCERT Textbook to study Science, then you must come across Chapter 15 Our Environment. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 10 Science Chapter 15 Our Environment in one place.
NCERT Solutions Class 10 Science Chapter 15 Our Environment
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For a better understanding of this chapter, you should also see summary of Chapter 15 Our Environment , Science, Class 10.
NCERT Solutions Class 10 Science chapter 15 Our Environment
Class 10, Science chapter 15, Our Environment solutions are given below in PDF format. You can view them online or download PDF file for future use.
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Question & Answer
Q.1: What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Ans : Trophic Levels : The various steps in a food chain at which the transfer of food (or energy) takes place are called trophic levels. Example A food chain operating in a grassland is given below : Grass -> Insects -> Frog-> Birds In this food chain 1. Grass represents first trophic level. 2 Grasshopper represents second trophic level. 3. Frog represents third trophic level. 4 Eagle represents fourth tropic level.
Q.2: What is the role of decomposers in the ecosystem?
Ans : (i) Decomposers help in decomposing the dead bodies of plants and animals and hence act as cleansing agents of the environment. (ii) Decomposers also help in putting back the various elements of which dead plants and animals are made, back into the soil, air and water for reuse by the producers like crop plants. (iii) They help in recycling of the nutrients. (iv) They decompose dead remains thereby providing space for new life to settle in the biosphere.
Q.3: Why are some substances biodegradable and some non-biodegradable?
Ans : The microorganism like bacteria and other decomposer organisms (called saprophytes) present In our environment are specific in their action. They break down the materials or products made from natural materials (say, paper) but do not break down man-made materials such as plastics. So, it is due to the property of decomposer organisms of being specific in their action that some waste materials are biodegradable, whereas others are non-biodegradable.
Q.4: Give any two ways in which biodegradable substances would affect the environment.
Ans : (i) Biodegradable substances are decomposed by the action of microorganisms and decomposed materials are recycled through geo-chemical cycle. (ii) These substances keep the environment clean.
Q.5: Give any two ways in which non-biodegradable substances would affect the environment.
Ans : (i) They cause air, water and soil pollution. (ii) They may cause bio-magnification in the food chain and end up in humans.
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