(C) Statement $I$ is correct because excessive use of chemical fertilizers leads to eutrophication in water bodies and contamination of groundwater,wh

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(C) Statement $I$ is correct because excessive use of chemical fertilizers leads to eutrophication in water bodies and contamination of groundwater,while also accumulating as residues in crops.Statement $II$ is correct because organic farming utilizes sustainable practices like crop rotation,green manure,composting,and biological pest control to maintain soil health and ecological balance.Therefore,both statements are correct.

Class 12 Biology Environmental Issues Mix Example-Environmental Issues

Medium

Which of the following statements is/are correct?
$I.$ Chemical fertilizers cause pollution of water bodies as well as groundwater,besides getting stored in crop plants. Therefore,environmental scientists are pressing for a switch over to organic farming.
$II.$ Organic farming is a form of agriculture that relies on techniques such as crop rotation,green manure,compost,and biological pest control.

A
Only $I$
B
Only $II$
C
$I$ and $II$
D
None of these

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Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of planktonic (free-floating) algae which can accelerate which of the following phenomenon?

At the beginning of the twentieth century,forests covered about ....... of the land of India. By the end of the century,it shrunk to.......

$A$: $El$ $Nino$ is a climatic change which causes deleterious environmental changes.$R$: Increased tropospheric ozone due to $El$ $Nino$ causes a shift of climatic regions.

$UV$ radiation from the sun causes which of the following eye disorders?

Which one of the following pairs is not correctly matched?

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$A$: $El$ $Nino$ is a climatic change which causes deleterious environmental changes.
$R$: Increased tropospheric ozone due to $El$ $Nino$ causes a shift of climatic regions.