In plant biotechnology,$PEG$ is used in

$A$ 'Pomato' plant,which exhibits characteristics of both tomato and potato,has been created. What type of hybridization is this?

What are the applications of callus and suspension cultures?

What are the selected organs,tissues,or cells from a plant called in tissue culture?

$A$ technique of micropropagation is

Read the following statements:
$I.$ Colostrum is recommended for newborns because it is rich in antigens.
$II.$ Chikungunya is caused by a Gram-negative bacterium.
$III.$ Tissue culture has proved useful in obtaining virus-free plants.
$IV.$ Beer is manufactured by the distillation of fermented grapes.
How many of the statement$(s)$ is/are correct?