NCERT Revision Notes for Chapter 9 Living Organisms and their Surroundings Class 6 Science

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• Habitat 
• Adaptations
• Types of habitat 
• Acclimatisation
• Components of a habitat

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→ The ability of living organisms to adjust themselves to the surroundings is called as adaptation.

→ Adaptations are the changes in structure or behaviour of an organism that will allow the organism to survive in that habitat.

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→ There are two types of habitat:

(i) Terrestrial habitat

ii. Aquatic habitat

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→ Terrestrial habitat is further classified into:

(i) Forests

(ii) Grasslands

(iii) Deserts

(iv) Mountains

(v) Polar Regions

(i) Forest

→ These are large areas covered with trees and plants.

→ Organisms living in the forest depend upon abiotic factors like air, availability of water, temperature, sunlight etc.

→ Three types of forests are tropical forests, temperate forests and boreal forests.

(ii) Grasslands

→ These are mainly covered by long and thick grasses.

→ Temperature ranges between -20℃ and 30℃.

→ Annual rainfall they receive varies between 50cm and 90cm.

(iii) Deserts

→ These are the areas that receive scanty rainfall.

→ These are dry with sand covering the whole region.

→ Deserts are mostly hot regions but some of them are even too cold regions.

(iv) Mountains

→ These regions are rocky and dry.

→ Sometimes water occurs as flowing streams.

→ Plants present on hills are xerophytes. These are conical and evergreen.

(v) Polar region

→ These regions are covered with high snowy peaks.

→ Animals found here are adapted by having thick furry coat on the skin.

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→ It refers to the region covered with water where plants and animals survive.

(a) Freshwater habitat: These are the water bodies filled with fresh water. These include rivers, lakes, ponds, streams etc.

(b) Marine habitat: Ocean and seas are termed to be marine habitat. These are full with life. Different varieties of organisms exist in marine habitat.

(c) Coastal habitat: This is the region represented by the place where land meets the sea.

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Biotic components 

→ It include all the livings organisms in a habitat, i.e. plants, animals and microorganisms.

Abiotic components 

→ It includes all the non-living things in a habitat, i.e. air, soil, water, sunlight and temperature.

→ The favourable conditions for survival of living organisms are provided by abiotic components.

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(i) Air

→ Air is essential for all the living organisms on earth.

→ Plants and animals take in oxygen from the air during respiration.

→ Air is required by organisms to cool their body.

(ii) Soil

→ Soil is the topmost layer of the earth.

→ Soil is rich in minerals and microorganisms which help in different ways for plant growth.

(iii) Water

→ Water forms a medium for many metabolic reactions taking place inside the body.

(iv) Sunlight

→ Sun is the ultimate source of energy for all the living organisms on earth.

→ Plants depend on sunlight for synthesising their food by the process of photosynthesis.

(v) Temperature

→ Temperature at a place depends on the sunlight available at the particular place.

→ Temperature also influences the humidity of that particular place.