: a theory that explains the peculiar features of such stars as the Cepheid variables by assuming an expansion and contraction of the star as a whole in a regular periodic pulsation.

“State is a combination or association of persons in the form of government and governed and united together into a politically organised people of a definite territory.”

Arthur Eddington

Sir J.C. Bose proposed a theory of ascent of sap known as pulsation theory. The pulsation theory states that water is absorbed by the plants due to the metabolic activity of living cells which are in constant state of rythmatic pulsation.

J.C. Bose

The cohesion-tension theory is a theory of intermolecular attraction that explains the process of water flow upwards (against the force of gravity) through the xylem of plants. It was proposed in 1894 by John Joly and Henry Horatio Dixon.

A transpiration pull could be simply defined as a biological process in which the force of pulling is produced inside the xylem tissue. This force helps in the upward movement of water into the xylem vessels. In this process, loss of water in the form of vapours through leaves are observed.

Define the ascent of sap. The upward movement of water from the root to aerial parts of the plant body is called ascent of sap or often called translocation of water. Class-10 » Science. 98 Qs. Ascent of sap is the movement of water and minerals from the roots to the aerial parts of the plant through xylem tissue.

The upward movement of water from the root to the top of the plant is called as ascent of sap. Plants absorb water through the roots and transpire through leaves. The water moves from the root to the tip portion of the plant body against the force of gravity.

1a : the act of rising or mounting upward : climb completed their ascent of the mountain. b : an upward slope or rising grade : acclivity followed the steep ascent to the top of the hill. c : the degree of elevation : inclination, gradient.

Guttation is the loss of water in the form of water droplets from hydathodes (small pores) on the leaf margin of a small herbacious plant. Plants have hydathodes at the end of the veins, through which this excess water is lost in the form of droplets.

Guttation is the appearance of little droplets of liquid on the leaves of plants. Some people notice it on their houseplants and expect the worst. Although unsettling the first time it happens, guttation in plants is completely natural and not harmful.

Guttation – how plants deal with too much water. Guttation is the expelling of excess water or nutrients through tiny openings on leaves and stems. This biological process enables plants to restore balance to their nutrient and water content.

Guttation usually occurs in the plants growing in the warm and humid climate. It usually occurs during night or in the morning when the absorption of water exceeds that of the transpiration. Due to which, root pressure is increased in xylem and water comes out through hydathodes.