Complete the following paragraph to explain the cohesion tension theory. The mov

Question

Complete the following paragraph to explain the cohesion tension theory. The movement of water up a plant can be explained through the combination of two principles: (1) Water molecules can establish weak _______ with one another because they are _______ (have a slightly positive end and a slightly negative end). Further, water is able to adhere to _______ tracheids and vessels. (2) Water is known to move by _______ from cells with _______ water potential to cells with _______ water potential. During , water evaporates from spongy mesophyll cells and exits the leaf through . leaving the mesophyll cells with lower water potential than their adjacent cells. Water then moves from the adjacent cells into the first sat of cells and a chain reaction is begun with water being pulled through and between cells. This puts an enormous amount of______ on the water column.

Explanation / Answer

The movement of water up a plant can be explained through the combination of two principles:

1) Water molecules can establish weak hydrogen bonds with one another because they are polar,(have a slightly positive end and a slightly negative end). Further, water is able to adhere to xylem tracheids and vessels.

2) Water is known to move by osmosis from cells with higher water potential to cells with lower water potential. During transpiration, water evaporates from spongy mesophyll cells and exits the leaf through stomata, leaving the mesophyll cells with lower water potential than their adjacent cells. Water then moves from the adjacent cells into the first set of cells and a chain reaction is begun with water being pulled through and between cells. This puts an enormous amount of tension on the water column.

Hydrogen Bonds- Polar molecules, such as water molecules, have a weak, partial negative charge at one region of the molecule (the oxygen atom in water) and a partial positive charge elsewhere (the hydrogen atoms in water).

Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves.

Osmosis is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides.or osmosis can also be defined as movement of water molecules from the region of their higher concentration to the region of their lower concentration through a semi-permeable membrane

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