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Mudita Gautam

· started a discussion

· 1 Months ago

el nino is not a boon for the coast (Question: 111987.5 )

as mentioned in the text, the nutrient rich water from depths does not come up when el nino is there, only the water near the surface is brought up and thus nutrient crunch is there

Question:
DIRECTIONS: In the following questions, you have eight brief passages with questions following each passage. Read the passages carefully and choose the best answer to each question out of the four alternatives.


Time was when people looked heavenward and prayed, "Ye Gods, give us rain, keep drought away." Today there are those who pray. "Give us rain, keep EI Nino away."


EI Nino and its atmospheric equivalent, called the Southern Oscillation, are together referred to as ENSO, and are household words today. Meteorologists recognize it as often being responsible for natural disaster worldwide. But this wisdom dawned only after countries suffered, first form the lack of knowledge, and then from the lack of coordination between policy making and the advances in scientific knowledge.


Put  simply, EI Nino is a weather event restricted to certain tropical shores, especially the Peruvian coast. The event has diametrically opposite impacts on the land and sea. The Peruvian shore is a desert. But every few years, an unusually warm ocean current -EI Nino-warms up the normally cold surface-waters off the Peruvian coast, causing very heavy rains in the early half of the year.


And then, miraculously, the desert is matted green. Crops like cotton, coconuts and banana grow on the otherwise stubbornly barren land. These are the Peruvians, anos de abundencia or years of abundance. The current had come to be termed EI Nino, or the Christ Child because it usually appears as an enhancement if a mildly warm current that normally occurs here around every Christmas.


But this boon on land is accompanied by oceanic disasters. Normally, the waters off the South American coast are among the most productive in the world because of a constant up swelling of nutrient rich cold waters from the ocean depths. During an EI Nino, however waters are stirred up only from near the surface. The nutrient-crunch pushes down primary production, disrupting the food chain. Many marine species, including anchoveta (anchovies) temporarily disappear.


This is just one damning effect of EI Nino. Over the years its full impact has been studied and what the Peruvians once regarded as manna, is now seen as a major threat.

How can we say that EI Nino proves to be a boon for South American Coast?

Options:
A) It causes an upswelling of rich nutrients making it the most productive in the world
B) It caused the destruction of many marine species such as anchoveta
C) It warms up normally cold surface waters off causing heavy rains
D) It enhances warm currents around every Christmas
Solution:
Ans: (a) It causes an upswelling of rich nutrients making it the most productive in the world

Normally, the waters off the South American coast are among the most productive in the world because of a constant up swelling of nutrient rich cold waters from the ocean depths. 

Vaibhav Arora

· commented

· 1 Months ago

yes, i second you, in fact its clearly written that during el nino the water is stirred up only from the surface
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