Question

In 1935, Dam identified a factor abundant in green leaves, which protects from hypoprothrombinemia, is
A.Vitamin A
B.Ca
C.Vitamin B
D.Vitamin K

Answer 1

Hint: Henrik dam was a danish scientist who won the Nobel prize in medicine in 1943 for the discovery of the vitamin K and its physiological role in blood coagulation and termed it coagulation vitamin. His initial findings were reported by a German publication which designated the compound as coagulation vitamin, and from then on was called vitamin K.

Complete answer:Hendrik dam was a danish biologist and a physiologist. In the year 1935, he along with his colleague Edward Doisy were experimenting with cholesterol-free feed for chickens. In his experiments, he fed a group of test chickens a cholesterol-free chicken feed.
He used chloroform to remove the cholesterol content and fed the chickens. When he compared the chickens fed with cholesterol-free feed with that with normal feed, he found that the chickens developed hemorrhages and were bleeding from tags on their wings.
He then fed the test chickens purified cholesterol and found no change in the developed conditions. From then on, he and Doisy went on to identify a second compound which was isolated during the cholesterol removing process, and named it the coagulation vitamin.
He and Doisy won the Nobel prize in medicine in 1943 for the discovery of the coagulation vitamin. It is known as vitamin k as his initial reporting was done through a German publication which spelled the word coagulation vitamin.
Therefore, the correct option is D) Vitamin K

Note:Vitamin k was isolated by Henrik dam in 1935, for which he won the Nobel prize along with Edward Doisy in 1945.
Vitamin k was found to be responsible for blood clotting and coagulation, vital in terms of wound healing.