Transport in Plants Test - 1

Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure

Two cells close to each other are called contiguous cells. Movement of water from one cell to other depends upon Diffusiion pressure deficit (DPD). DPD depends upon osmotic pressure and water pressure. So, movement of water from A to B will take place.

Potometer is used for measuring rate of transpiration in plant. Loss of water in form of water vapour is called transpiration.

Water is essential for all physiological activities of the plant and plays avery important role in all living organisms. It provides the medium in which most substances are dissolved.

Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell.

Plasmolysis is one of the results of osmosis and occurs very rarely in nature, but it happens in some extreme conditions.

The porinsare proteins that form huge pores in the outer membranes of the plastids, mitochondria and some bacteria allowing molecules up to the size of small proteins to pass through.