Tag: biology

Convection plays a major role in the formation of a thunderstorm. When warm air rises and meets the cold air, it condenses (releases latent heat). The heat helps fuel the thunderstorm. Then the downdraft forms, bringing cold air and precipitation down to the earth's surface.   

Air is used in generating electricity for example wind mill is used to generate electricity. 

As we go higher and higher the pressure and oxygen decreases, so as due to less oxygen content mountaineers carry oxygen cylinders with them.

The power of diffusion is max in gases because the inter-molecular space between the molecules is highest in gases,

Ethylene is an important natural plant hormone, used in agriculture to force the ripening of fruits. Binding of ethylene to the receptors unleashes a signaling cascade that leads to activation of transcription factors and the turning on of gene expression. The climacteric is a stage of fruit ripening associated with increased ethylene production and a rise in cellular respiration.

Ethylene is a plant hormone which is present in gaseous form. It is formed by the breakdown of methionine, which is in all cells. Thus, methionine is called as the precursor of ethylene hormone. Ethylene hormones helps in the ripening of fruits when sprayed onto it. Ethylene hormone is present mainly in rapidly dividing cells, which is usually in darkness due to the action of methionine, which is the precursor molecule.

Ethylene is a gas that forms through the breakdown of methionine, which is in all cells. Ethylene has very limited solubility in water and does not accumulate within the cell but diffuses out of the cell and escapes out of the plant. Its effectiveness as a plant hormone is dependent on its rate of production versus its rate of escaping into the atmosphere. Ethylene is produced at a faster rate in rapidly growing and dividing cells, especially in darkness.

Ethylene is a simple gaseous PGR. It is synthesised in large amounts by tissues undergoing senescence and ripening fruits. Ethylene is used to initiate flowering and for synchronising fruit-set in pineapples. It also induces flowering in mango. Since ethylene regulates so many physiological processes, it is one of the most widely used PGR in agriculture. The most widely used compound as source of ethylene is ethephon. Ethephon in an aqueous solution is readily absorbed and transported within the plant and releases ethylene slowly. Ethephon hastens fruit ripening in tomatoes and apples and accelerates abscission in flowers and fruits (thinning of cotton, cherry, walnut). It promotes female flowers in cucumbers there by increasing the yield.