# NCERT Solutions for Class 10 Science Chapter 15 Our Environment

Mod Education are Provided Best Solution for CBSE RBSE NCERT Solution for Class 10 Science Chapter 15 Our Environment Object Question last year Exam Question Chapter Solution, Video Classes, MCQs.

Page Contents

## NCERT Solutions for Class 10 Science Chapter 15 Our Environment

### What is the role of decomposers in the ecosystem?

Decomposers break down the organic components of dead and decaying matter into simple inorganic substances. The organic matter like dead animal bodies are recycled in the ecosystem thereby cleaning the environment. And, the inorganic elements return back the minerals into the soil making the soil fertile. Thus, decomposers play a vital role in the ecosystem.

### Why are some substances biodegradable and some non-biodegradable?

Substances that can be broken down by biological processes are said to be biodegradable. In our environment, many of the substances are broken easily by decomposers. Examples: Paper, vegetable peels etc.
However, substances which cannot be broken down biologically but by physical means are known as non-biodegradable substances. Example: Plastic.

### What is ozone and how does it affect any ecosystem?

Ozone (

) is a molecule formed by 3 oxygen atoms. Ozone is present in the stratosphere shielding the earth’s surface from the harmful UV rays by absorbing it.
Ozone may affect the ecosystem in the following ways:
1. If this layer gets depleted, the UV rays can cause cancer in human beings and also some plants and animals.
2. The UV rays may effect the plants and destroy the vegetations.

### How can you help in reducing the problem of waste disposal? Give any two methods.

Two methods used to reduce the problems of waste disposal are:
Throwing biodegradable and non-biodegradable waste into separate dustbins so that recycling can be done easily.
By putting the organic waste into compost pits dug in the ground and preparing compost. This compost helps in increasing the fertility of soil.
Practicing the 3 R’s: Reduce, Reuse and Recycle.

[sc name=”class8910″ ][/sc]