The $UN$ Conference of Parties on climate change in the year $2012$ was held at

When did the Government of India introduce the concept of $JFM$?

$A$ lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this:
$1.$ Lots of urea and phosphate fertilizer were used in the crops in the vicinity.
$2.$ The area was sprayed with $DDT$ by an aircraft.
$3.$ The lake water turned green and stinky.
$4.$ Phytoplankton populations in the lake declined initially,thereby greatly reducing photosynthesis.
Which two of the above were the main causes of fish mortality in the lake?

In the given pie chart,what do $W, X, Y$ and $Z$ represent respectively?

Given below are two statements.
Statement $I$ - Algal blooms impart a distinct color to the water bodies.
Statement $II$ - Some bloom-forming algae are extremely toxic to fishes but not to human beings and other animals.
In the light of the above statements,select the correct option:

Select the appropriate option regarding forest conservation.