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Single cell protein and biofortification
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Consider the following four statements (a–d) and select the option which includes all the correct ones only.
(a) Single cell $Spirulina$ can produce large quantities of food rich in protein, minerals, vitamins etc.
(b) Body weight-wise the microorganism $Methylophilus\ methylotrophus$ may be able to produce several times more proteins than the cows per day
(c) Common button mushrooms are a very rich source of vitamin C
(d) A rice variety has been developed which is very rich in calcium(a) is correct: $Spirulina$ can be grown easily on waste water, molasses, straw etc. and yields large quantities of food rich in protein, minerals, fats, carbohydrates and vitamins.
(b) is correct: a 250 kg cow produces about 200 g of protein per day, whereas in the same period 250 g of $Methylophilus\ methylotrophus$ can be expected to produce about 25 tonnes of protein because of its high rate of biomass production.
(c) is wrong: button mushrooms are valued for protein, B-group vitamins and vitamin D, and are not a very rich source of vitamin C.
(d) is wrong: the biofortified rice variety developed is rich in iron (about five times more iron than commonly consumed varieties), not in calcium.
So only statements (a) and (b) are correct.