Tag: science & technology

A solar cell is NOT an internal combustion engine because it converts sunlight directly into electricity through the photovoltaic effect, with no combustion involved. Jet engines, car motors, and diesel engines all rely on burning fuel internally to produce mechanical energy.

Radial drainage patterns develop on dome-shaped landforms where streams flow outward in all directions from a central high point, like spokes on a wheel. This pattern is characteristic of volcanic domes, upraised domes, or anticlinal structures. Very flat areas develop dendritic patterns, and altitude alone doesn't determine drainage pattern.

Rice cultivation requires continuous semi-aquatic conditions - fields must be flooded with standing water throughout most of the growing season. This is why rice is grown in paddies. Wheat, sugarcane, and groundnuts are dry-land crops that grow in well-drained soil.

Chlorofluorocarbons (CFCs) are the primary cause of ozone layer depletion. When CFCs reach the stratosphere, UV radiation breaks them apart, releasing chlorine atoms that catalytically destroy ozone molecules. Methane is a greenhouse gas, PAN is a secondary pollutant, and sulfur oxides cause acid rain.

Mulberry leaves are the sole food source for the domesticated silkworm (Bombyx mori) which produces high-quality commercial silk. The silkworms are entirely dependent on mulberry leaves for growth and cocoon production. Banyan, hibiscus, and chrysanthemum are not used in sericulture.

The Chernobyl nuclear disaster occurred on April 26, 1986, at the Chernobyl Nuclear Power Plant in Ukraine (then part of the Soviet Union). This was the worst nuclear accident in history, causing widespread radiation contamination. 1979 refers to the Three Mile Island accident in the USA, while 1984 is too early and 1990 is too late.

The first Earth Summit, officially known as the United Nations Conference on Environment and Development (UNCED), was held in Rio de Janeiro, Brazil, in June 1992. This historic conference produced key agreements including the Rio Declaration and Agenda 21. Port of Spain is in Trinidad, Dar-es-Salaam is in Tanzania, and Buenos Aires is in Argentina - none hosted the 1992 summit.

Operation Tiger is specifically a conservation program focused on protecting tigers, which are an endangered species due to poaching and habitat loss. While jungles, wildlife, and the environment are related concepts, the operation's primary focus is on tiger conservation specifically. This is analogous to Project Tiger in India.

Carbon dioxide is a greenhouse gas that traps heat in the Earth's atmosphere through the greenhouse effect, leading to global warming and rising temperatures. Increased CO2 does not cause cooling, has no effect on ultraviolet radiation (that's the ozone layer's role), and definitely changes Earth's temperature. This is a fundamental concept in climate science.