Fill in the blanks:

(a) Microorganisms can be seen with the help of a ________.

(b) Blue green algae fix _______directly from air to enhance fertility of soil.

(c) Alcohol is produced with the help of _______.

(d) Cholera is caused by_______.

Tick the correct Solution:

(a) Yeast is used in the production of

(i) sugar (ii) alcohol (iii) hydrochloric acid (iv) oxygen

(b) The following is an antibiotic

(i) Sodium bicarbonate (ii) Streptomycin (iii) Alcohol (iv) Yeast

(c) Carrier of malaria-causing protozoan is

(i) female Anopheles mosquito (ii) cockroach (iii) housefly (iv) butterfly

(d) The most common carrier of communicable diseases is

(i) ant (ii) housefly (iii) dragonfly (iv) spider

(e) The bread or idli dough rises because of

(i) heat (ii) grinding (iii) growth of yeast cells (iv) kneading

(f) The process of conversion of sugar into alcohol is called

(i) nitrogen fixation (ii) moulding (iii) fermentation (iv) infection

Match the organisms in Column I with their action in Column II.

Can microorganisms be seen with the naked eye? If not, how can they be seen?

What are the major groups of microorganisms?