(a) Microorganisms can be seen with the help of a microscope.
(b) Blue green algae fix nitrogen directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of microorganisms.
(d) Cholera is caused by bacteria.
Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation
| A | B | ||
|---|---|---|---|
| (i) | Kharif crops | (a) | Food for cattle |
| (ii) | Rabi crops | (b) | Urea and super phosphate |
| (iii) | Chemical fertilizers | (c) | Animal excreta, cow dung urine and plant waste |
| (iv) | Organic manure | (d) | Wheat, gram, pea |
| (e) | Paddy and maize | ||