Environmental Science MCQ Questions and answers | EVS MCQ

A mycorrhiza is a symbiotic association between a green plant and a fungus. The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus, and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil.

Commensalism - an association between two organisms in which one benefits and the other derives neither benefit nor harm. It does not promote coevolution.

The United Nations Conference on Environment and Development (UNCED), also known as the Rio de Janeiro Earth Summit, the Rio Summit, the Rio Conference, and the Earth Summit (Portuguese: ECO92), was a major United Nations conference held in Rio de Janeiro from 3 to 14 June in 1992.

Although the units for sound intensity are technically watts per meter squared, it is much more common for it to be referred to as decibels, dB. A decibel is a ratio of the observed amplitude, or intensity level to a reference, which is 0 dB.

River segments is the largest in terms of scale.

Natural earthquakes are caused by earth's crust.

Eutrophication most commonly arises from the oversupply of nutrients, most commonly as nitrogen or phosphorus, which leads to overgrowth of plants and algae in aquatic ecosystems. After such organisms die, bacterial degradation of their biomass results in oxygen consumption, thereby creating the state of hypoxia.

Organism that must consume other organisms to obtain food for energy.

Nuclear accidents mostly release radioactive iodine into the atmosphere.

For photosynthesis, presence of carbon dioxide, water, chlorophyll and sunlight is required. Only when these elements are present, can photosynthesis occur in plant. Plants use water to help break down carbon dioxide so its components can be combined with those in water to form sugar molecules.