Which three crops contribute the most to global food production?

Statement $P$: New varieties are developed through processes like grafting,tissue culture,cloning,and hybridization.
Statement $Q$: It provides necessary information regarding the identification of collected,certified,and newly discovered plant specimens.

Which of the following statements is incorrect?

Which of the following is not a characteristic of $Saccharum$ $barberi$?

The world's $P$ livestock is possessed by $Q$ and the contribution to the world farm produce is $R$.
$\quad P\quad\quad Q\quad\quad\quad\quad\quad R$
$(A)$ $70 \%\quad$ India and China $\quad 25 \%$
$(B)$ $70 \%\quad$ India and America $\quad 25 \%$
$(C)$ $30 \%\quad$ India and China $\quad 75 \%$
$(D)$ $30 \%\quad$ India and America $\quad 75 \%$

Green revolution means