Environmental Science - Study Mode

[#371] The destruction of the forest areas by man made efforts is called
Correct Answer

(B) Deforestation

Explanation

Solution: Deforestation, clearance, clearcutting or clearing is the removal of a forest or stand of trees from land which is then converted to a non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated deforestation occurs in tropical rainforests.

[#372] Mycorrhiza represents
Correct Answer

(D) Symbiotic association between a fungus and roots of higher plants

Explanation

Solution: 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.

[#373] Which of the following interactions will not promote co evolution?
Correct Answer

(A) Commensalism

Explanation

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

[#374] Earth summit was held in
Correct Answer

(B) Rio de Jeneiro in 1992

Explanation

Solution: 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.

[#375] The unit of measurement of intensity of sound is in _________
Correct Answer

(A) Decibels

Explanation

Solution: 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.