Answer the given question
a) Fertile soil has lot of humus. Why?
b) Why step farming is common in hills?
c) Why are root nodules useful for the plants?
Answers
Explanation:
1 Fertile soil has lots of humus because it contains microorganisms that decompose dead organic matter present in soil and help in the formation of humus. Humus is a sources of mineral, absorbs water and makes the soil porous for easy passage of plant roots.
2 Step farming or terrace farming is common in hills to check soil erosion through water current on the slopes. It provides a physical barrier to soil erosion by water.
3 They contain symbiotic bacteria called rhizobia within the nodules, producing nitrogen compounds that help the plant to grow and compete with other plants. When the plant dies, the fixed nitrogen is released, making it available to other plants and this helps to fertilize the soil.
Answer:
1) Fertile soil has lots of humus because it contains micro organisms that decompose dead organic matter present in soil and help in the formation of humus.
2) Step farming is done in hilly slopes because it helps in preventing the runoff of water which can bring floods in the valley or foot hills .
3) Root nodules contains symbiotic bacteria called rhizobium with in the nodules producing nitrogen compounds that help the plant to grow and compete with other plants.
Hope this three answers useful for you.