Question

A well developed archegonium with neck consisting of 4-6 rows and neck canal cells, characterises

• A. gymnosperms and flowering plants
• B. pteridophytes and gymnosperms
• C. gymnosperms only
• D. bryophytes and pteridophytes.

Answer 1

The Correct Option is D

The question asks about the characteristic structure of a well-developed archegonium, which is pertinent to certain plant groups.

First, let's define what an archegonium is: it is the female reproductive structure found in some plants that produces and contains the ovum or egg cell.

The emphasis here is on the "neck" of the archegonium, which consists of 4-6 rows and neck canal cells. This structure is notably characteristic of bryophytes and pteridophytes. Here's why:

1. Bryophytes (e.g., mosses and liverworts): These are non-vascular plants that reproduce through spores. The archegonium in bryophytes commonly features a well-defined neck structure consisting of several cell layers that facilitate the passage of sperm to the egg.
2. Pteridophytes (e.g., ferns): These are vascular, non-seed bearing plants that also reproduce via spores. Pteridophytes possess similar archegonia with multiple neck cells which play a crucial role in fertilization by guiding sperm to the ovum.

In contrast:

• Gymnosperms: While they do have archegonia, the structure might vary, and they do not always display the same degree of the detailed neck structure seen in bryophytes and pteridophytes.
• Flowering Plants (Angiosperms): These have highly evolved reproductive structures where the archegonium is not present in the same form. Instead, they have ovules contained in ovaries.

Therefore, the correct answer is "bryophytes and pteridophytes," as these plant groups distinctly exhibit the described archegonium structure.