Identify the vitamin responsible for blood clotting, the cause of preventable blindness in children, and the disease caused by Vitamin B1 deficiency.

here are the answers to the questions:

Question 4:
The correct option is D.
Vitamin K is crucial for blood clotting because it is essential for the synthesis of several proteins, including prothrombin, which are involved in the coagulation cascade. Without sufficient Vitamin K, the blood's ability to clot is impaired.

Question 5:
The correct option is D.
Vitamin A deficiency is recognized as the leading cause of preventable blindness in children worldwide, particularly in developing countries. It can lead to xerophthalmia, which progresses from night blindness to permanent blindness if untreated.

Question 6:
The correct option is A.
Beriberi is a disease caused by a deficiency of Vitamin B1 (thiamine). It affects the cardiovascular and nervous systems, leading to symptoms such as weakness, nerve damage, and heart problems.