To solve the food problem of the country,which among the following is necessary?

The milkman in our society started carrying a lactometer. His move was well appreciated by the society members.
$(a)$ What is the use of a lactometer? On what principle does it work?
$(b)$ What values of the milkman are shown by this move?

Find out the wrong statement from the following:

Which of the following are Indian cattle?
$(i)$ $Bos$ $indicus$
$(ii)$ $Bos$ $domestica$
$(iii)$ $Bos$ $bubalis$
$(iv)$ $Bos$ $vulgaris$

How can genetically modified crops be obtained?

Complete the crossword puzzle (Fig.).
Across
$1.$ Oil yielding plant $(9)$
$3.$ Crop grown in winter season $(4)$
$5.$ Fixed by Rhizobium $(8)$
$9.$ Common honey bee $(4)$
Downward
$2.$ Animal feed $(6)$
$4.$ $A$ micronutrient $(5)$
$6.$ Unwanted plant in crop fields $(4)$
$7.$ An exotic breed of chicken $(7)$
$8.$ Bottom feeders in fish pond $(7)$
$10.$ $A$ marine fish $(4)$