Question

Answer the following questions: (8)

1. State any four uses of microorganisms.

2. Write two points of difference between: manures and fertilizers.

3. Explain the process of harvesting.

4. What happens when –

a) dilute sulphuric acid is poured on a copper plate?

b) iron nails are placed in copper sulphate solution?​

Answer 1

Explanation:

(1.) # 1. Production of Antibiotics:

# 2. Production of Dairy Products:

# 3. Production of Alcoholic Beverages:

# 4. Production of Bread making:

# 5. Production of Food Yeast:

(2.) Manures are obtained from natural sources, whereas fertilisers are synthetically manufactured in the factories. Manures are eco-friendly, whereas fertilisers harm the useful microbes present in the soil and also decrease the soil fertility if used for a longer time.

(3.) HARVESTING. Harvesting is the act of removing a crop from where it was growing and moving it to a more secure location for processing, consumption, or storage. Some root crops and tree fruit can be left in the field or orchard and harvested as needed, but most crops reach a period of maximum quality—that is, they ripen or mature—and will deteriorate if left exposed to the elements.

(4.)

a) Cu do not react with dilute sulphuric acid as it comes behind hydrogen in the reactivity series. But with concentrated H2 SO4 it reacts to form CuSO4 and SO2 is evolved.Cu+2H2 SO 4 (conc)→CuSO4 +SO2 +2H2O

Ob) Since Fe is more reactive than Cu. It will displace Cu from CuSO4 and form FeSO4 . A color change of blue to light green will occur.

. A color change of blue to light green will occur.Fe+CuSO4 →FeSO4 +Cu

Hope it helps u plzz mark it as brainalist ✌️✌️❤️

Answer 2

Answer:

ans 1 microorganisms have many uses

1. they help to convert milk into curd

2.they utilise the soil into fertile soil

3.they also use for making medicines

4.they also give nitrogen to the soil.