In the plant kingdom, the 'amphibians' refer to: MCQ with Answer and Explanation

Explanation:
Root pressure is a positive hydrostatic pressure generated in the xylem of roots due to the active secretion of ions into the xylem, which lowers the water potential and causes water to enter osmotically from the soil. This pressure can push water up the stem. Root pressure is most evident and measurable during the early morning or at night, when the rate of transpiration from the leaves is very low (or zero) and the soil moisture is high, allowing for maximum water absorption. It is responsible for phenomena like guttation and the exudation of sap from cut stems.

Explanation:
Salivary glands secrete saliva containing salivary amylase (ptyalin) which begins starch digestion. The stomach's gastric glands secrete HCl, creating an acidic medium for pepsin action. Bile is synthesized continuously by the liver, stored, and concentrated in the gall bladder, but not produced by it. Therefore, statements 1 and 2 are correct, while 3 is false.

Explanation:
The cerebrum is the largest and most developed part, responsible for thought, memory, sensory processing, and voluntary movement.