In tissue culture,roots can be induced by

Both in callus and suspension cultures,the commonly used auxin 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?

What demonstrates cellular totipotency?

Which of the following is an application of embryo rescue?

Which of the following is $NOT$ a primary objective of embryo culture?