Q8 of 287 Page 347

Give three important reasons why soil is essential for living organisms.’

● Soil is thr major resource require for plant to grow and produce food.

● Without soil no plants will exist and animals will die due to starvation.

● Soil holds the plants and prevents them from being eroded by environmental calamities.

● Soil is a habitat to many insects and microorganisms.

What effects does the increasing organic waste have on the dissolved oxygen content and biochemical oxygen demand of water?

What is phenomenon through which certain pollutants get accumulated in tissues in increasing concentration along the food chain, called?

What is chief source of precipitation?

What do you mean by rainwater harvesting?