Mention any two advantages and two disadvantages of producing hydroelectricity by building dams on rivers.

Construction of a huge dam creates large scale destruction of natural vegetation and wildlife in those areas which get submerged. This is not good for the ecosystem. Hence, environmental aspects...

(i) Biomass is a renewable source of energy only if we plant trees in a planned manner which is not the case with hydroelectricity. (ii) The energy from bio-mass can be...

Advantages: (i) The use of geothermal energy does not cause any pollution. (ii) The use of geothermal energy is quite economical. Disadvantages: (i) It is not available everywhere. (ii) Deep drilling in the Earth to...

(i) Social problems (ii)Economic problerns (iii) Environmental problems.

Vegetative propagation is a process in which any vegetative part of a plant (root, stem or leaf) gives rise to a new plant under appropriate conditions.  Two advantages:  (i) Large number of...

Attempts were made to decongest the city of London and solve the housing crisis. So, the British government built houses for working classes. All these efforts expanded the city and...

(a) West flowing rivers Narmada and Tapti do not form delta, because topography of western peninsular India is rocky without loose sediments and no alluvial sediments carried by the rivers.

Advantages: (i) These are the main source of power generation. (ii) They provide us neat, pollution free and cheapest energy which is the backbone of industry and agriculture. (iii) These projects control...

Pulses are mostly grown in rotation with other crops because: (i) Pulses need less moisture and survive even in dry conditions. (ii) Being leguminous crops, all these crops help in restoring soil...

Tea: Crows well in tropical and sub-tropical climates. Soil type: Deep and fertile, well-drained soil, rich in humus and organic matters. Climate: Warm and moist, frost-free climate throughout the year. Rainfall: Frequent showers...