The condition caused by insufficient secretion of thyroxine in adults is: MCQ with Answer and Explanation

Explanation:
The corpus luteum, formed after ovulation, secretes progesterone (and some estrogen) to maintain the uterine lining for pregnancy. If no fertilization, it degenerates, causing menstruation. Estrogen is also produced by growing follicles, testosterone by Leydig cells, prolactin by anterior pituitary.

Explanation:
Cutin, along with waxes, forms the cuticle on the epidermis of leaves and stems, reducing water loss and providing protection. Lignin strengthens cell walls, cellulose is the wall polysaccharide, suberin is in cork cells and root endodermis.

Explanation:
Vitamin K is a fat-soluble vitamin required for the synthesis of clotting factors II (prothrombin), VII, IX, and X in the liver. Deficiency leads to prolonged clotting time and bleeding disorders. Vitamin A is for vision, C for collagen synthesis and antioxidant, E for antioxidant. Vitamin K is found in green leafy vegetables and synthesized by gut bacteria.