Question

Antipodal cells enlarge tremendously in
A. Sasa
B. Caltha
C. Aconitum
D. Both B and C

Answer 1

Antipodal cells are the three haploid cells which are present at the chalazal end of the female gametophyte and it gets degenerate soon after fertilisation.

Complete answer:
First of all you should know what antipodal cells are. These are the cells present at the chalazal end of the female gametophyte which functions to provide the nourishment to the egg cell. Female gametophytes are also called embryo sac. In embryo sac, there is presence of three haploid cells on the opposite end of the micropyle and these three haploid cells are antipodal cells. These cells degenerate after fertilization without enlargement while in Caltha and Aconitum, these cells enlarge tremendously and they move towards the center.
Let's look at options now, Option A is Sasa. This option is incorrect since there is no enlargement of antipodal cells seen in the Sasa as the antipodal cells degenerate soon after fertilisation in Sasa. Therefore, this option is incorrect and it gets eliminated.
Moving to option B which is Caltha. In Caltha, there is tremendous enlargement of antipodal cells due to which this option can be correct but let's look at more options since the enlargement is also seen in Aconitum.
Moving to option C which is Aconitum. In Aconitum, there is tremendous enlargement of antipodal cells but the enlargement of antipodal cells is also seen in Caltha and hence both of these are correct options.
Moving to option D which is Both B and C. This is the correct option as both in Caltha and Aconitum, the antipodal cells enlarge tremendously and they move towards the center. Therefore, this option is the correct one since the enlargement of antipodal cells are seen in both of them.

Thus, the correct answer is option D which is Both B and C.

Note: Antipodal cells are present at the opposite of the micropyle and these cells provide nourishment to the embryo sac. Antipodal cells usually get degenerate after fertilisation but in case of Caltha and Aconitum, these antipodal cells become enlarged and they move towards the center.