The main function of the large intestine is: MCQ with Answer and Explanation

Explanation:
The cohesion-tension theory, primarily proposed by Dixon and Joly (and later supported by Denison), is the most widely accepted mechanism for the ascent of sap in tall trees. It relies on the physical properties of water. Transpiration from the leaves creates a negative pressure (tension) in the xylem. This tension pulls the water column upwards. The water column remains unbroken due to the high cohesive force between water molecules (hydrogen bonding) and the adhesive force of water to the hydrophilic walls of the xylem vessels and tracheids. This creates a continuous, passive pull from the top.

Explanation:
The liver plays a crucial role in carbohydrate metabolism, storing excess glucose as glycogen and releasing it when blood sugar drops. The spleen acts as a blood filter, removing old, damaged, or abnormal red blood cells and storing platelets. The appendix is a small, blind-ended tube attached to the cecum; it has no significant role in human digestion and is considered a vestigial organ. Thus, statements 1 and 2 are correct.

Explanation:
Vaccines induce active immunity (antibodies + memory). Active takes time, passive is immediate but no memory. Innate is nonspecific.