Crop Production and Management — Science STD 8 — Question

Write True/ False against the following statement. Oxygen in air is an exhaustible natural resource.

Fill in the blanks:Small amount of a mineral salt present naturally in water makes it a______________ of electricity.

Name any five objects used in our everyday life which are made of metals.

Select the correct word from the following list and fill in the blanks. float, water, crop, nutrients, preparation The first step before growing crops is _________ of the soil.

Name the protected area, built to support the biodiversity.

Name the major component of natural gas.

Will the solution of sugar in distilled water conduct electricity?

The nucleus of a cell contains chromosomes for inheritance. How many chromosomes are there in the nuclei of a human cell ?

Name one compound which is decomposed into hydrogen and oxygen by using the chemical effect of electric current.

Arrange the following in order to show how deforestation leads to water pollution ?
I. The roots of the trees no longer have a firm grip on the soll.
II. Rainfalls onto the ground.
III. The trees of a forest are cut down.
IV. The loose soil gets washed away into a nearby body of water.