QUIZ – 2020: INSIGHTS STATIC , 10 April 2021 – Environment

Solution: c)

Most of the organic toxins are water insoluble and non-biodegradable.

These high persistent toxins are, therefore, transferred from lower trophic level to higher trophic level through food chain.

Solution: a)

Indicator species, organism—often a microorganism or a plant—that serves as a measure of the environmental conditions that exist in a given locale.

Example – Lichens: Quality of air can be determined based on its presence.

Solution: b)

There are many plants in which parts like the root, stem and leaves develop into new plants under appropriate conditions. This property of vegetative propagation is used in methods such as layering or grafting to grow many plants like sugarcane, roses, or grapes for agricultural purposes. Plants raised by vegetative propagation can bear flowers and fruits earlier than those produced from seeds. Such methods  also make possible the propagation of plants such as banana, orange, rose and jasmine that have lost the capacity to produce seeds. Another advantage of vegetative propagation is that all plants produced are

genetically similar enough to the parent plant to have all its characteristics.

Solution: b)

Ecological pyramid doesn’t give evidence on introduction of new species.

Solution: c)

Commensalism is a type of symbiotic relationship between organisms in which one organism benefits without harming the other.

Many birds form a commensal relationship with some species of ants like the army ants. A great number of army ants trail on the forest floor, and while moving, stir up many insects lying in their path. The birds follow these army ants and eat up the insects that try to escape from them. The birds benefit by catching their prey easily, while the army ants are totally unaffected.