What is an embryoid?

What are the advantages of tissue culture methods over conventional methods of plant breeding in crop improvement programmes?

Identify the incorrect statements from the following:
$(i)$ Callus is obtained in $2$ to $3$ weeks.
$(ii)$ Suspension culture does not show faster growth compared to callus culture.
$(iii)$ Orchid seeds do not contain stored food.
$(iv)$ $2,4-D$ is used only in callus culture.

Which part of the plant is best suited for making virus-free plants and why?

One week old embryo can be preserved at

What is the advantage of pollen culture?