Tag: evs - i

Natural resources are materials provided by the earth that humans can use to make more complex (human-made) products.

Wind turbines convert the kinetic energy in the wind into mechanical power. This mechanical power can be used for specific tasks (such as grinding grain or pumping water) or a generator can convert this mechanical power into electric power.

Tidal energy is the indirect form of solar energy. Tides are the rise and fall of sea levels caused by the combine effects of the gravitational force exerted by the Moon and Sun and the rotation of the Earth. About 1% of the total solar radiation that reaches earth is converted into energy of wind. As the sun heats different parts of the earth at different rates, air circulates from cold to warm areas producing winds.

In situ conservation is on-site conservation or the conservation of genetic resources in natural populations of plant or animal species, such as forest genetic resources in natural populations of tree species. National parks, wildlife sanctuaries and biosphere reserves are examples for in-situ conservation.

Ex situ conservation is the conservation and maintenance of samples of living organisms outside their natural habitat, in the form of whole plants, seed, pollen, vegetative propagules, tissue or cell cultures.
In vitro techniques have been increasingly used for plants in the last 40-50 years. Conservation of genebank accessions is only one of several uses for the techniques. The basic procedure consists of conserving parts of plants in flasks or tubes in artificial media, under controlled environments, normally in sterile conditions. A prerequisite of successful in vitro conservation is that the plants or plant parts can be regenerated into complete plants for growth and use in any of the ways that genetic resources are used.
Cryopreservation or cryoconservation is a process, where cells, whole tissues, or any other substances susceptible to damage caused by chemical reactivity or time are preserved by cooling to sub-zero temperatures.
All these methods could be used to conserve vegetatively propagating crops.

Gene banks are a type of biorepository, which preserve genetic material. For plants, this could be by freezing cuttings from the plant or stocking the seeds (e.g., in a seedbank). 

A phytotron is an enclosed research greenhouse used for studying interactions between plants and the environment. Phytotrons are chambers, that provide controlled environmental conditions for growing plants. Phytotrons have been extensively used for research on how various environmental factors affect plant growth and development.

Petroleum is a fossil fuel that was formed from the remains of ancient marine organisms.
Millions of years ago, algae and plants lived in shallow seas. After dying and sinking to the seafloor, the organic material mixed with other sediments and was buried. Over millions of years under high pressure and high temperature, the remains of these organisms transformed into what we know today as fossil fuels. Coal, natural gas, and petroleum are all fossil fuels that formed under similar conditions.
Today, petroleum is found in vast underground reservoirs where ancient seas were located.

Litter burning is a common method of waste handling but it is not the best method of waste handling, because the nutrients in litter get converted into oxides and are lost from the ecosystem of the place. Over a period of time when wastes are burnt instead of recycling the nutrient status declines and consequently productivity will be less. 

Sirius is a star,it is not a planet of the sun.The star Sirius is the brightest star in the sky. It is commonly known as the Dog Star.