The spider plant fights against _________________________.

What are the general measures to reduce pollution ?

To produce more food for growing human population some fungicides and insecticides are used to kill _____________________.

Which of the following chemical in water affects teeth and bones ?

Many palaces in India have an age - old practice of water storage and water recharge system like the __________________.

Chimneys of the industries should be __________________ , so that their emissions are given out high up atmosphere.

Which of the following are correct :

(a) Sewage should not be released directly into rivers or lakes. They should be properly treated in sewage treatment plants.

(b) Harmful chemicals should not be dumped into water bodies. They should be transformed into some useful substances.

The pollution in city like Delhi may be controlled to great extent  ____________________

Which of the following are correct :

(a) Aloe vera extract aids in healing cuts, burns and skin problems.

(b) The effects of air pollution on plants are widely seen and damage all plants including our food crops and trees.

Which of the following are correct :

(a) Treatment of water with alum also helps in its purification.

(b) Water must be sterilized by chlorination, It kills the microbes.

(c) Trees reduce erosion that washes pollution into the water and reduces erosion.