Question

Summary of the lesson our environment

Answer 1

1. Summary of the lesson our environment

Our Environment CBSE Class 10 Science Chapter 15 - Complete explanation and Notes of the chapter ‘Our Environment’. Topics covered in the lesson Components of environment, Biological magnification, Waste, Ozone depletion, Environmental pollution, Montreal protocol, Ecosystem, Management of garbage, Food chain, Food web, Energy transfer in food chain. Given here is the complete explanation of the chapter, along with all the important questions and NCERT solutions to book questions have also been provided for the ease of students.

Components of environment

 

Abiotic: They are the nonliving factors that affect the environment. They include the following-

1) Climatic factors like wind, water, light  and temperature.

2) Physiographic factors like height, slope.

3) Edaphic factors like minerals, soil, texture, soil organism, ph of the soil, etc.

Biotic : These are the living factors that affect the environment. They include the following-

1)  Grazing animals

2)  Insects

3)  Lichens

4) Humans

5) Parasites

Waste

We come across many waste things around us like garbage,kitchen waste, etc. They are simply defined as the useless or discarded materials.They may be gaseous, liquid or solid in nature. Their disposal is a big problem and on the basis of degradation, they are classified in the following ways:

Biodegradable waste: It is the waste that is broken down by biological processes, like by the saprophytes. For example: kitchen waste, sewage, cotton, cloth, etc.

Non biodegradable waste:These are those wastes which can not be broken down by the biological processes. For example: plastics, polythene bags, etc. This non-biodegradable waste creates environmental pollution.

Ecosystem

It is a structural and functional unit of the biosphere comprising of living organisms and their interaction with food chain and biogeochemical cycles. For example a garden has many different plants in it such as grasses, trees, flowering and non flowering plants, animals like frogs, insects, etc. These organisms interact with each other and they are also affected by abiotic factors that affect their growth, reproduction and other activities.

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