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Question

Which one of the following plant is endangered due to over exploitation?
  1. Dioscorea
  2. Maize
  3. Wheat
  4. Rice

A
Dioscorea
B
Maize
C
Wheat
D
Rice
Solution
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Over exploitation which refers to the overuse or harvesting of any species of animals or plants from its wild environment by the human beings at a rate faster than the recovery rate of the natural populations leads to the creation of endangered species. Plants are harvested for medicines, food, building purposes, and raw materials. Dioscorea species especially (Dioscorea deltoidea or Elephant's Foot which is native to Afghanistan, Bhutan, Cambodia, China, India, Lao PDR, Nepal, Pakistan, Thailand and Vietnam, is an endangered species. The dried rhizomes are used both as traditional medicine to treat a variety of diseases, mainly gastric problems, and are also a source of steroidal drugs for western medicine.
So, the correct answer is 'Dioscorea'

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