Biology Previous year question Of Ecology, biodiversity and Environment For NDA

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Previous year question Of Ecology, biodiversity and Environment For NDA

Previous year question Of Ecology, biodiversity and Environment

Previous year question

Q 2317312280

Food wrapped in newspaper is likely to get contaminated with
NDA Paper 2 2010

(A)

Lead

(B)

Aluminium

(C)

Iron

(D)

Magnesium

Solution:

Lead is a common environmental pollutant. Sometimes, the food wrapped in a newspaper is likely to get contaminated with lead because newspaper ink contains this element.

Correct Answer is `=>` (A) Lead

Q 2317512489

Which one of the following processes takes place in a lakes during eutrophication?
NDA Paper 2 2009

(A)

Rapid destruction of algal growth

(B)

Excessive availability of dissolved oxygen

(C)

Loss of dissolved nutrients from water

(D)

Excessive entry of nutrient into water

Solution:

Inorganic phosphorus and nitrogen is responsible for the growth of algae. In polluted water, it increases due to which algae increase greatly at the surface of water or pond. Forming water bloom. Due to death of these algae, their organic matter get decomposed due to which oxygen gets depleted and the aquatic animals die. If there activities persist for long time, the pond has more organic matter and less water. This process is called eutrophication.

Correct Answer is `=>` (D) Excessive entry of nutrient into water

Q 2317123080