What is the use of $Agar-Agar$ gel?

The property of cellular totipotency is exhibited by:

What is the part of the plant used in tissue culture called?

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?

Capacity of a living nucleated cell to differentiate into any other type of cell and form a complete new organism is called . . . . . . .

Which of the following hormones is used to induce callus formation from shoot tips?