The scientific study has said that the universe expands day by day. Literally it may mean the abiotic component but the actual fact is that it is shrinking. Actually speaking the population of man in this universe is increasing greatly. Man being the one to create problem in every aspect of the ecosystem always tries to find an alternative to compensate the loss. Greenhouse is one such beautiful finding made by man to grow plants effectively. Greenhouse, by the name it suggests that it is a house for growing the green. Many would be familiar of the phrase, “Grow green or else we ruin”. Greenhouse has given each and every human being a wonderful platform to cultivate plants.
Basic forms:
A greenhouse has two basic forms. One is attached greenhouse and other is a standalone greenhouse. In attached greenhouse the power supply is supplied from the house itself where as in case of a standalone greenhouse the power supply and all the other accessories has to be supplied separately. These types of standalone greenhouses can be made where there is sufficient space to have an individual green house. Greenhouse can be built using either plastics or by means of glass. The photo chromatic technique that can be employed in glass makes it preferable over plastics. The basic concept behind the photochromatization is nothing but SMA. SMA is the abbreviation of shape memory alloys. Shape memory alloys are also known as super alloys. These substances have the natural tendency to adjust to the situations that prevail and act accordingly.
Basic models:
The two basic models of greenhouse are cold frames and rack. Cold frames are set out in situations were there is less amount of space where as in case of racks ample space for setting of greenhouse is a must. The greenhouse cold frames constitute to the simplest and cheapest forms of greenhouse. By the name it suggests that it is suitable for growing of plants that requires cold climate. Cold frames are normally used for early sprouting of the seeds, growth of herbs and so on. It is so important for certain plants that the temperature within in the house doesn’t go beyond a particular temperature. So for cultivating those kinds of plants cold frames are very important. The glass panels adjust so as to allow only a small amount of sunlight to enter the greenhouse thereby preventing the damage of plants. Hence greenhouse cold frames are more preferred ones amongst the farmers.
Agricultural Biodiversity 
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