Forum

Natural Resources

Rainfall patterns depend on
(a) the underground water table
(b) the number of water bodies in an area
(c) the density pattern of human population in an area
(d) the prevailing season in an area

05/11/2024

Science

9th

Natural Resources

The process of nitrogen-fixation by bacteria does not take place in the presence of
(a) molecular form of hydrogen
(b) elemental form of oxygen
(c) water
(d) elemental form of nitrogen

05/11/2024

Science

9th

Natural Resources

The two forms of oxygen found in the atmosphere are
(a) water and ozone
(b) water and oxygen
(c) ozone and oxygen
(d) water and carbon-dioxide

05/11/2024

Science

9th

Natural Resources

One of the following factors does not lead to soil formation in nature
(a) the sun
(b) water
(c) wind
(d) polythene bags

05/11/2024

Science

9th

Natural Resources

What would happen, if all the oxygen present in the environment is
converted to ozone?
(a) We will be protected more
(b) It will become poisonous and kill living forms
(c) Ozone is not stable, hence it will be toxic
(d) It will help harmful sun radiations to reach earth and damage many
life forms.

05/11/2024

Science

9th

Natural Resources

If there were no atmosphere around the earth, the temperature of the earth will
(a) increase
(b) go on decreasing
(c) increase during day and decrease during night
(d) be unaffected

05/11/2024

Science

9th

Natural Resources

The atmosphere of the earth is heated by radiations which are mainly
(a) radiated by the sun
(b) re-radiated by land
(c) re-radiated by water
(d) re-radiated by land and water

05/11/2024

Science

9th

Why Do We Fall ILL

Why is AIDS considered to be a ‘Syndrome’ and not a disease?

05/11/2024

Science

9th

Why Do We Fall ILL

Give any four factors necessary for a healthy person.

05/11/2024

Science

9th

Why Do We Fall ILL

Becoming exposed to or infected with an infectious microbe does not necessarily mean developing noticeable disease. Explain.

05/11/2024

Science

9th