13/05/2019 - Environment

May 13, 2019
3 months

Does the introduction of exotic species pose a threat to the sorroundings? Explain with any two relevant illustrations (200 Words)

Refer - The Indian Express

Enrich the answer from other sources, if the question demands.

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IAS Parliament 3 months


Exotic species, often referred to as alien, nonnative, nonindigenous, or introduced species, are those that occur in areas outside of their natural geographic range.

Yes, exotic species pose a threat to environment

·        “Russian poplar” is a misnomer as the tree has nothing to do with Russia. It was introduced in Kashmir in 1982 under a Word Bank-aided social forestry scheme. The tree is a Western American species.

·        With the onset of May, the “Russian poplars” shed their seeds covered in cotton-like material. The cotton-covered seeds can be seen in the air, on the ground and in water-bodies.

·        Around the same time, patients complaining of respiratory diseases swell many times. People have been blaming the seeds for the respiratory diseases.

·        Citing Article 21, the court also observed: “The right to life can become meaningful, only if a person is healthy.” And direct concerned authorities to remove branches of Russian poplars.

·        A 2017 study by the Government Medical College, Srinagar, found that the pollen of “Russian poplars” can cause allergic reactions in less than 20% of the population.

Exotic species clean environment

·        Common water hyacinth, is an aquatic plant native to the Amazon basin, and is often a highly problematic invasive species outside its native range.

·        But, Water Hyacinth can absorb minerals and inorganic substance from the sewage. It can be grown rapidly in every kinds of condition.

·        As a result, after using it to clean the sewage, it is brought to use as organic fertilizer like compost or mulching.

·        Water Hyacinth could be brought to make compost in order to add nutrients to plant and solve the problem of lacking soil fertility.

·        It gradually emits nutrients useful to plants in long period. It also resists acid and alkaline in soil and adds food source for microbe. As a result, there is a large amount of microbe and microbial activity.

·        Water Hyacinth can be brought to make compost, mulching and to clean the sewage. It is a good way to change waste products into useful things.

·        In case of phytoremediation water hyacinth absorbs metals like lead, chromium, mercury from the area and cleanse it.

N.k 3 months



IAS Parliament 3 months

Good answer. Try to include Water hyacinth which helps in composting, absorbing toxic metals like mercury, chromium etc. Keep Writing.

N 3 months

Hi, sir actually i am new to UPSC. i just want know you that, weather you write answer before reading reference (which is given above) or After reading that... Please answer Sir

Hrituraj 3 months

Please review..

IAS Parliament 3 months

Cut short the introduction part. Try giving other example like Water hyacinth which helps in absorbing metal wastes like lead mercury, used for composting etc. Keep Writing.