Question

Which of the following statements about vitamin B${}_{12}$ is false?

• A. It has a cobalt atom.
• B. It also exists in plants.
• C. It is present in rain water.
• D. It is needed by human body in very small amounts.

Answer 1

Answer: (B)

It also exists in plants.

Vitamin $B_{12}$ does not exist in plants, but is synthesized by microorganisms (bacteria, fungi).

Therefore, humans must obtain $B_{12}$ in the diet, either from animal sources (red meat, fish, poultry, eggs and dairy products).

Cobalt is also an essential trace element for humans, and is found at the centre of vitamin B12 and a range of other co-enzymes called cobalamins.

Option B is correct.