Question

Which of the following statements are correct?
a. Callus is the disorganised mass of cells formed under in vitro condition.
b. Totipotency is the ability of a plant organ to regenerate an entire organism when cultured in a suitable medium.
c. Embryoid is the embryo-like structure formed under in vitro condition which has the potentiality to develop into a plantlet.
d. Explant is the excised portion of plant tissue or organ which is used in tissue culture study.
Select the correct answer using the codes given Codes.

• A. $1,2$ and $4$
• B. $1,3$ and $4$
• C. $1,2$ and $3$
• D. $2,3$ and $4$

Answer 1

The correct option is A $1,2$ and $4$

• Callus is defined as a group of cells derived from competent source tissue that is cultured under in vitro conditions to form an undifferentiated mass of cells.
• Totipotency denotes the ability of a cell to generate an entire organism. For instance, if separated, each blastomere from a mouse 2-cell embryo is capable of developing into a complete organism.
• An explant is a cell, organ, or piece of tissue which has been transferred from animals or plants to a nutrient medium.
• Embryoid bodies are aggregates of pluripotent cells that are induced to differentiate by a combination of a change in culture medium (removal of factors that support pluripotency) and allowing the cells to interact in three-dimensional structures.

So, the correct option is 'A'.