Q2 of 55 Page 118

What is organic farming? Discuss the benefits of organic farming as a viable practise in the context of developing nations like India.

a) Organic farming is the use of bio-fertilisers in agriculture.


b) Bio-fertilizers are the organisms which improve the fertility of soil by enriching it with nutrients.


c) Main sources of biofertilizers – bacteria, fungi, cyanobacteria.


d) Benefits of organic farming are-


i. Maintains long term soil fertility


ii. Eco-friendly


iii. Controls pests without harming the environment


iv. Since chemical fertilizers and pesticides are not used, the water bodies remain safe and pollution free.


v. The food produced is chemical-free and highly nutritious.


vi. Makes use of resources, already available to the farmer. Hence, it is economic.


e) A developing country like India needs organic farming due to the above mentioned benefits.


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11

Observe the figure A and B given below and answer the following questions


i. The power generation by the above two methods is non-polluting True/False.


ii. List any two applications of solar energy


iii. What is a photovoltaic cell?


 1

Write a short note on electronic waste. List the various sources of e-wastes and the problems associated with its disposal.

 3

Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution. Discuss their causes and adverse effects to the environment.

 4

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