An autovent is a device for maintaining a greenhouse or conservatory within a range of temperatures. The basic principle is that as greenhouse heats above ambient the air inside becomes lighter, the vent opens when a certain temperature is reached and lets the hot air out - drawing cooler air in from outside.

A solar greenhouse works by letting in solar radiation and trapping the energy from that radiation to increase and maintain the internal temperature above that of the temperature outside - see greenhouse effect for details.

A greenhouse (also called a glasshouse or hothouse) is a building where plants are cultivated. A greenhouse is built of glass or plastic; it heats up because the sun's incoming electromagnetic radiation warms plants, soil, and other things inside the building. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall.

Botanically, a coconut is a simple dry fruit known as a fibrous drupe (not a true nut). The husk (mesocarp) is composed of fibres called coir and there is an inner "stone" (the endocarp). This hard endocarp (the coconut as sold in the shops of non-tropical countries) has three germination pores that are clearly visible on the outside surface once the husk is removed. It is through one of these that the radicle emerges when the embryo germinates. Adhering inside wall of endocarp is the testa with a thick albuminous endosperm, the coconut meat, the white and fleshy edible part of the seed.

The Coconut Palm (Cocos nucifera), is a member of the Family Arecaceae (palm family). It is the only species in the Genus Cocos, and is a large palm, growing to 30 m tall, with pinnate leaves 4-6 m long, pinnae 60-90 cm long; old leaves break away cleanly leaving the trunk smooth. The term coconut refers to the fruit of the coconut palm.