The water holding capacity is the highest in

The microorganisms present in the soil require moisture (water) and nutrients for growth and survival. Choose from the options below, the habitat (place) where the soil has plenty of water and nutrients.

Availability of water and minerals in the soil for maximum absorption by roots is in the

The soil that can be moulded into any shape is

Percolation rate is measured in unit

Soil is........ part of our life.

Soil contains..........,................ and countless............ organisms.

Substance like................ and................. pollute the agricultural soil

Clay is a the..........rock particle.

Paddy requires.............soil to grow.

The removal of upper surface of soil is called soil pollution.

Cotton is grown in sandy-loam soil.

Erosion of soil is more severe in the barren land.

Silt is somewhat bigger rock particles than clay.

Topsoil contains humus.

Give the formula to calculate the absorption percentage.

There is shimmering of air just above the soil during hot summer day. What does the term shimmering indicate?

It is necessary to ban the use of polythene bags and plastics. Do you agree? If yes, why?

Can we make toys with the soil obtained from a field? Explain?

How can a farmer convert acidic soil into neutral soil?

Sketch the cross-section of soil and label the various layers.

A student visits two types of field and observes that soil from field A has high percolation rate of water, while soil from field 8has low percolation rate. In field 8, paddy crop was grown while in field A, there was no standing crop. Name two types of soil present in two fields.

During the summer vacations, Gaurav visited his native village. He observed that farmers were using pesticides in their field. He contacted the village head and explained him the effects of such substances in causing soil pollution. Next day, the. village head called a meeting of all the villagers and convinced the villagers not to use chemicals and pesticides.
(a) Why is there a ban to demand the polythene bags and plastics.
(b) List some substances which pollute the soil.
(c) What are the values shown by Gaurav?

Why is soil erosion relatively less in dense forests as compared to barren, open fields?

Gardeners gently dig up the soil around the roots of garden herbs (plants) frequently. Give reasons

The contamination of soil with waste materials causes soil pollution. Does the use of pesticides in agriculture also contribute to the soil pollution? Explain.

Soil erosion does not occur easily where the land is covered by vegetation. Do you agree? Explain.