During middle age <span>an individual may experience initial decline of physical and mental attributes. This also increases during the last stage of life, old age.</span>
DDT stands for dichloro-diphenyl-trichloroethane. The first kind of synthetic/artificial insecticides came into use in the 1940s. The earlier usage of DDT include: a) Killing of malarial vectors, b) Combatting Typhus and other insect borne human diseases, c) As a pest control in crops d) as a pest control in garden, live stock production and even at homes.
The negative impact of DDT could be felt for the first time when the pests that were earlier killed by use of DDT have now become pesticides resistant. In the 1950s in USA, the regulatory measures were adopted to reduce the usage of DDTs as its effects as a pesticides were no more long significant and also it was creating detrimental physical and psychological impacts on the human and environment.
It was in 1972 that the U.S. Environmental Protection Agency cancelled the order for banning the usage of DDT based on the adverse impact it produced on the environment, human and other life forms. Since then continuous studies are being conducted to analyse the impact of DDTs. In some later years it was established that DDT is the cause of producing tumors in liver.
Some of the common negative impacts produced by DDT as per the U.S. Department of Agriculture :
a) The non destructive nature – DDT can not be destroyed and thus it remains persistent in the atmosphere
b) It attacks the tissues of living organisms especially the animals and humans ( fatty tissue)
c) It can penetrate the atmosphere to deeper extent.
Now as per the current stuation, The use of DDT is controlled and other alternatives of pest control organisms is being deduced. As per the treaty of Stockholm Convention on POPs (Persistent organic pollutants) , usage of DDT for malarial control is justified but it puts a restrictive use of DDT as pesticides in other areas.
Answer:
Option (A)
Explanation:
The Inuits refers to those people that live in the Arctic region, such as Greenland, the northern region of Canada, as well as Alaska. The region in which they live can be considered as tundra, which is characterized by the presence of low temperature, dry wind, shorter duration of seasons, and lack of vegetation. This type of region is found in the polar and near-polar areas and in the high altitude areas.
The climate of tundra is very cold, and there occurs the layer of permafrost in the soil, and it does not provide the essential conditions for the growth of plants. The growth of crops is hindered by the shorter season, lack of sunlight and low precipitation.
This is why the Inuits are dependent on hunting for heir survival
Thus, the correct answer is option (A).
