NCERT Solutions for Class 10 Science Chapter 15 Free PDF Download
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CBSE Class 10 Science Chapter 15 – Our Environment NCERT Solutions
NCERT Solutions for Class 10 Science Chapter 15 belong to the 5 of unit 5 natural resources. The solutions given here to the questions for exercises and in-between exercises at the end of the chapter are prepared by the subject matter expert. Also, this is available in simple and lucid language. In chapter 15, students will learn about the ecosystem – food chains, webs, and what are its components. Also, all the chapters are supported by explanatory images and detailed texts.
In chapter 15, our environment students will also learn about how do our activities affect our environment. Additionally, the solutions given for the exercise at the fag end of the chapter helps in giving a clear perspective to the readers about the key ideas of the chapter. Chapter 15, our environment holds a total weight of 7 marks in the final exam. Get the 100% accurate class 10 science chapter 15 NCERT solutions explained by our expert science teachers. We will provide the solutions step by step for the questions given in the class 10 science textbook as per the CBSE guidelines.
Sub-topics covered under NCERT Solutions for Class 10 Science Chapter 15
- Ex 15.1 – What happens when we add our waste to Environment?
- Ex 15.2 – Eco-system – What are its components?
- Ex 15.2.1 – Food Chains and Webs
- Ex 15.3 – How do Our activities affect the Environment?
- Ex 15.3.1 – Ozone Layer and How it is Getting Depleted
- Ex 15.3.2 – Managing the Garbage we Produce
NCERT Solutions for Class 10 Science Chapter 15
Q-1 What do you mean by ozone hole? What are its consequences?
Solution:- In polar regions, stratospheric clouds provide the surface for chlorine nitrate and hypochlorous acid. They react to form chlorine molecules. Photolysis of chlorine molecules a HOCI gives chlorine-free radicals.
The chlorine-free radicals lead to the decomposition of ozone This initiates a chain reaction. The chlorine-free radical is continuously regenerated which depletes the ozone layer. It is called the ozone hole. Consequences of ozone depletion: The ozone layer protects the earth from the harmful UV radiations of the sun. Due to its depletion, more radiation enters the earth’s atmosphere.
UV radiations cause aging of skin, cataract, skin cancer and sunburns. Hence, they are harmful. They cause the death of phytoplankton which leads to a decrease in fish productivity. Excess exposure may even cause mutation in plants, increase UV radiation, decrease the moisture content of soil and damage both plants and fibers.
CIONO 212 +,08 ->HOCI%, + HNO38) CIONOX) + HCIO 14x) + HNO)
HOCI, “10x)+CH! Clue, Cle+CH Cl.) +06) >10x)+ O210
Q-2 Why are some substances biodegradable and some non-biodegradable?
Solution:- Substances are classified as biodegradable and non-biodegradable because some substances can be decomposed by microorganisms and some cannot.
Substances that are broken into simple soluble forms are called biodegradable substances and the substances that are not decomposed by microorganisms into harmless substances are called non-biodegradable substances. Non-biodegradable substances cannot be degraded by microorganisms as they lack the enzymes necessary for their degradation.
Q-3 Give any two ways in which biodegradable substances would affect the environment.
Solution:- Biodegradable substances affect the environment in the following ways:
The biodegradable substances such as tree leaves, plant parts, and kitchen wastes can be used as humus after composting. This will enhance soil fertility. The biodegradable substances mainly contain carbon. These substances after decomposition release that carbon back into the atmosphere.
Q-4 Give any two ways in which non-biodegradable substances would affect the environment.
Solution:- Non-biodegradable substances affect the environment in the following ways:
– They contaminate soil and water resources as they cannot be decomposed by micro-organisms.
– These substances, when accidentally eaten by stray animals, can harm them and can even cause their death.
These are some of the examples of solutions given in the free PDF prepared by our subject experts. For more detailed solutions and questions are given in the textbook download the PDF.
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