Question

1) What are the advantages of loosening and turning of the soil?
ar Name any two agricultural implements used in the field and explain it.
3) What are the advantages of using manures over fertilizers?
4)
Why is the removal of weeds necessary?
Differentiate between khariff crop and rabi crop?
6) Why earthworm and microbes are called the friends of the farmer?
Why damaged seeds are float on water while healthy seeds sink down?
B) Why is an appropriate distance between the seeds important?
9) What happens when a copper vessel is exposed to moist air for long?
10) How sulphurous acid is formed from sulphur dioxide? Also give chemical equation.
11) What does the POP sound indicate?
12) What is displacement reaction? Explain with an example.
d) Give 5 uses of non -metals.
14) Can copper displace zinc from its salt solution? Justify your answer.
15) Differentiate between the chemical properties of metals and non-
16) Name any 5 bases and acids. Also identify the metals and non-metals present in it.

Answer 1

1.ans :The benefits of loosening and turning the soil are:
1.It allows the roots to penetrate deep into the soil
2.loosening and turning of soli brings the nutrient rich soil to the top,so the plants can use those nutrients for their growth
3.the loosening n turning of soil also helps in the growth of several soil microbes n earthworms present in the soil so that they will provide humus to the soil