Plants get rid off excess water by the process called transpiration. Transpiration is the loss of water in the vapour form from the exposed surfaces of plants like leaves, stem, etc. Waste products may be stored in leaves that fall off. Also, there are other waste products, which are stored as resins and gums in old xylem (water conducting system). Translocation is the means to transport food from leaves to other parts of the plant or transport of water from the roots to other parts of the plant.

Oxygen is generated as a waste during photosynthesis in plants.

Loss of water from the surface of plant is responsible for the temperature of particular terrestrial habitat. 

Respiration in plants takes place through stomata, lenticels, and cuticle.

Guttation mainly takes place through lenticels.

Majority of stomata opens during the day, and it regulates the rate of transpiration in plants.

Rate of transpiration is dependent upon the vapour pressure deficit.

Turgor pressure of guard cells controls the opening and closing of stomatal pores. 

During summers, when temperature is high, the rate of transpiration will be high.  

Transpiration rate will be maximum when the atmosphere is dry.

The movement of guard cells regulates the rate of transpiration. 

Transpiration occurs when the outer atmosphere has less moisture than substomatal cavities. 

Anemometer is used to measure the velocity of wind. 

Rate of transpiration depends upon thefactors like stomatal freguency, position of stomata, the state of stomata (open or close), wind, temperature, humidity, etc.

Scotoactive behavior shown by the stomata can be defined as - stomata that opens only at night.