The vitamin that is essential for the synthesis of prothrombin is:
A. Vitamin A
B. Vitamin K
C. Vitamin C
D. Vitamin D
Answer: Option B
Solution (By JKSSB Mock Tests)
Vitamin K is required for the gamma-carboxylation of prothrombin (factor II) and other clotting factors, enabling them to bind calcium and participate in coagulation. Deficiency leads to bleeding.
Explanation:
Jonas Salk developed the inactivated polio vaccine (IPV) in 1955, which was the first effective vaccine. Albert Sabin later developed the oral polio vaccine (OPV). Pasteur rabies, Jenner smallpox.
Explanation:
The pleura consists of visceral pleura (adhering to lungs) and parietal pleura (lining chest wall), with pleural fluid between them reducing friction during breathing. Pericardium surrounds the heart, peritoneum lines the abdominal cavity, meninges cover the brain and spinal cord.
Explanation:
Root hairs are tubular extensions of epidermal cells in the zone of maturation of roots. They increase surface area for absorption of water and minerals. Cortical cells form the ground tissue, endodermis is the innermost layer of cortex with Casparian strip, and pericycle gives rise to lateral roots. Root hairs are unicellular in angiosperms, living for a short period and constantly replaced.
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