1. Which of the
following statements about vitamin B12 is false?
(a) It has a cobalt atom
(b) It also occurs in plants
(c) It is present in rain water
(d) It is needs for human body in very small amounts?
Ans. (c) Vitamin
B12 is not present in rain water. Vitamin B12 is a member
of the vitamin B complex. It contains cobalt, and so is also known as
cobalamin. It is exclusively synthesised by bacteria and is found primarily in
meat, eggs and dairy products. There has been considerable research into
proposed plant sources of vitamin B12. Fermented soya products,
seaweeds and algae such as spirulina have all been suggested as containing
significant B12. However, the present consensus is that any B12
present in plant foods is likely to be unavailable to humans and so these foods
should not be relied upon as safe sources. Many vegan foods are supplemented
with B12. Vitamin B12 is necessary for the synthesis of
red blood cells, the maintenance of the nervous system, and growth and
development in children. Deficiency can cause anemia.
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