Who amongst the following received the Nobel Prize in $1970$ for his outstanding research contribution?

Majority of people suffer from protein,vitamins and micronutrient deficiencies. Their food does not contain essential micronutrients specially:
$I$. iron
$II$. iodine
$III$. zinc
$IV$. vitamin-$A$
Which of the above are correct?

Growing crop plants in monoculture results in ........

The Brown Plant Hopper is known as:

Heterosis (hybrid vigor) is desirable in vegetatively propagated plants because...

Three types of carp fish,namely Catla,Labeo,and Cirrhinus,can be cultured together in the same pond to obtain higher economic yield because they exhibit: