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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) 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
Statements (a), (b)
B
Statements (c), (d)
C
Statements (a), (c) and (d)
D
Statements (b), (c) and (d)
Detailed Solution
(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.
(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.