Yeast is a kind of microscopic organism which readily grows in all kinds of sugary solutions and in plant exudations containing sugar. Yeast is economically important in many ways. Some are given below:

P. In breweries

Q. In bakeries

R. Curing of tobacco

In which of the following processes/ways does yeast not play an important role ?

1. Only R
2. Only P and Q
3. Only P, Q and R
4. None of the above

Amit and Sumit studied different kinds of microbes like viruses, bacteria, algae, fungi and protozoa. Which of the following statements does not match with the characteristic features of fungi ?

1. Fungi may be unicellular or multicellular.
2. They do not have chlorophyll and cannot prepare their own food.
3. Fungi help in biological nitrogen fixation and improve the soil fertility.
4. They are saprophytic in nature.

Assertion (A): Lactobacillus is a kind of bacteria which can convert milk into curd and curd into cottage cheese.

Reason (R): Lactose (milk sugar) can be converted into lactic acid by the action of Lactobacillus and different types of milk products like curd and cheese can be prepared.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.

Assertion (A): Tea leaves and tobacco leaves are cured by bacteria to obtain specific flavours and aroma.

Reason (R): Curing is the process during which leaves are roasted at a very high temperature along with bacteria and some edible colours.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.