Biology for ( Grade 10 )

Food chain in nature (a) in forest , (b) in grassland & (c) in a pond 15.2 (a) Types of food Chain : There are three types o ...

Plant Rat Snake Hawk. Aquatic food chains : Phytoplanktons Zooplanktons Small crustacians Predator insect Small fish Large fish ...

As much as food web complexes are there as much ecosystem is permanent or stable, such type of ecosystem does not degenerate na ...

An ecological pyramid is a graphical representation of an ecological parameter like number of individuals or amount of biomass o ...

Pyramid of number in tee ecosystem Pyramid of number shows biotic potential of an ecosystem. The number of members of any parti ...

obtained energy of each organism is utilized in their various metabolic activities and only 10% energy transferred to the next t ...

B.O.D. It shows the deficiency of oxygen in the water. Daphnia is the indicator of B.O.D. 15.5 OZONE LAYER DEPLETION : Between ...

succeeded in forging an agreement to freeze CFC production at 1986 levels., Nitrous oxide: is produced in industrial processes, ...

15.6 (b)Pollution of the Ganga: The Ganga runs its course of over 2500 km from Gangotri in the Himalayas to Ganga Sagar in the B ...

15.7 SUSTAINABLE DEVELOPMENT : It is the development which can be maintained for a long time without undue damage to the environ ...

Harvesting of rain helps in the conservation of groundwater. Composting of solid organic waste for biogas and manure. 15.10 WI ...

(i) They depend on forest produce, for various aspects of their life. (ii)The local people need large quantities of firewood, sm ...

15.11 (b) Forest Department of the Government : (i) Which owns the land and controls the forest resources. (ii)People develop pr ...

Nomadic shepherd drove their flock every summer in this area. 15.12 (c) Causes of Damages to Forests : (i) Local people damage ...

(E) By 1983, the Asabari forest showed a remarkable recovery. (iii) Economic growth and Ecological conservation : (A) Forest res ...

(ii) Failure to sustain underground water due to loss of vegetative cover, development of water demanding crop and pollution fro ...

Irrigation Control of flood which either stops or slows the amount of water in the river. Criticism about large dams : Social ...

Khadins, tanks and nadis in Rajasthan. Bandharas and tals in Maharashtra Ahars and Pynes in Bihar Kulhs in Himanchal Pradesh Po ...

waste. (E) Traditional water harvesting system : The water harvesting structures are mainly crescent shaped. Monsoon rains fill ...

the earth. 15.14 (a) Non-Renewable Energy Sources : These are energy sources which cannot be replaced easily when the get exhaus ...