EASY
Earn 100

What is the composition of soil?

Important Questions on Nutrition in Plant

HARD
How do leguminous plants make the soil fertile? 
EASY
How do nutrients get replenished in the soil?
MEDIUM
Why are manures and fertilizers added to the soil in a farm? 
EASY
_____ is added to soil to grow a healthy crop.
EASY
Overuse of pesticides lowers the _____ of soil.
EASY
Manure is the plant and animal waste that maintains soil fertility for a long time.
MEDIUM
What is Rhizobium? What is its function? How does Rhizobium help farmers? Why do farmers prefer to sow leguminous plants? In which form do plants absorb nitrogen?
MEDIUM
Plants use nitrogen directly from air for growth.
MEDIUM
In which form do plants absorb nitrogen? Why do farmers add nitrogenous fertilisers to the soil? Which microorganism helps to provide nitrogen to the plants? How do plants absorb nutrients other than carbohydrates from the soil?
MEDIUM
Radharaman is a farmer. He always grows leguminous crops in alternation with other crop plants. Why? 
MEDIUM
Make a list of activities for which soil is used.
MEDIUM
List a few benefits of the soil with the help of this statement. (Soil provides us ground to live on.)
EASY
Rhizobium bacteria fixes _____ in the soil. 
MEDIUM
Write in your own words about the way in which animals and plants help to preserve and enrich the soil.
MEDIUM

Match Column A with Column B.

Column A      Column B
1. Nitrogen i. supporter of combustion 
2Oxygen ii. significant impact on temperature
3. Carbon dioxide iii. used in metallurgy 
4. Water vapour iv. used to fill air balloons
5. Argon  v. absorbs infrared radiation
6. Helium vi. the main constituent of proteins
EASY
Which of the following is an example of symbiosis?
MEDIUM
Why do you think air and water are necessary soil components?
EASY

Write the uses of following natural resource.

Soil