Question

Refer to the following figures regarding Division Bryophyta
(i) 'A' are the androcyte mother cells of the antheridium, which give rise to a large number of biflagellate male gametes.
(ii) 'B' is the antheridial chamber and 'C' is the multicellular stalk of antheridium.
(iii) 'D' and 'E' respectively represent venter canal cells and neck canal cell of the female sex organ.
(iv) 'F' is the egg cell of the archegonium, which usually possesses several female gametes.
Which of the following combinations of above statements is incorrect?

• A. (i) and (ii)
• B. (iii) and (iv)
• C. (ii) and (iii)
• D. (i) and (iv)

Answer 1

Answer: (B)

(iii) and (iv)

The given figures belong to antheridium (male sex organ) and archegonium (female sex organ) of Marchantia (a bryophyte). A mature antheridium is an ovoid object raised on a short, multicellular stalk (labelled as Q. The stalk attaches the antheridium to the floor of the antheridia! chamber(labelled as B).The body of the antheridium has a jacket layer of sterile cells constituting its wall.

The latter encloses a mass of enterocyte mother cells(labelled as A). Androcyte mother cells give rise to a large number of biflagellate male gametes (sperms). The body of the archegonium consists of two parts, the venter (labelled as E) and the neck (labelled as D). The venter forms the swollen, basal portion of the archegonium.

It is continued into the long, slender, tubular neck. The venter consists of a wall of a single layer of sterile cells enclosing the venter cavity. The latter contains a small, upper ventral canal cell and a lower larger egg or ovum (labelled as F)

So the correct option is B.