Consider the following four statements (i – iv) and select the option which includes all the correct ones only. (i) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins, etc. (ii) Body weight-wise, the micro-organism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day. (iii) Common button mushrooms are a very rich source of vitamin C. (iv) A rice variety has been developed which is very rich in calcium.


(a) (iii) and (iv) only 

(b) (i), (iii) and (iv) only

(c) (ii), (iii) and (iv) only 

(d) (i) and (ii) only


Answer: (d) (i) and (ii) only


 The shift from grain to meat diets also creates more demand for cereals as it takes 3-10 Kg of grain to produce 1 Kg of meat by animal farming.
More than 25 per cent of human population is suffering from hunger and malnutrition.
One of the alternate sources of proteins for animal and human nutrition is Single Cell Protein (SCP).
Microbes are being grown on an industrial scale as source of good protein.
Blue-green algae like Spirulina can be grown easily on materials like waste water from potato processing plants (containing starch), straw, molasses, animal manure and even sewage, to produce large quantities and can serve as food rich in protein, minerals, fats, carbohydrate and vitamins. Incidentally such utilisation also reduces environmental pollution
Certain bacterial species like Methylophilus methylotrophus, because of its high rate of biomass production and growth, can be expected to produce 25 tonnes of protein.
The fact that edible mushrooms are eaten by many people and large scale mushroom culture is a growing industry
Common button mushrooms are a very rich source of vitamin D
. A rice variety has been developed which is very rich in iron content.