Question

Cells in the neck of archegonium of Dryopteris are in how many longitudinal or vertical rows?
A. 4
B. 6
C. 8
D. 2

Answer 1

Hint: A flask shaped structure consisting of a swollen venture and slender neck. There is absence of wall in center but there is presence of wall or neck cells in the neck of archegonium Dryopteris.

Complete answer:
Archegoniates is a flask shaped structure which consists of a swollen venter and a slender neck. In swollen venter, there is no venter wall but there is presence of naked eggs and along with the naked eggs there is presence of a small venter canal above it.
There is a wall or a jacket layer of 4 vertical rows of sterile neck cells in the slender neck. There is a presence of a central neck canal and these neck cells enclose a central neck canal.
Let's look at options now, option A is 4. This is the correct option since there is presence of 4 vertical rows of sterile neck cells in the neck of archegonium Dryopteris. Therefore, A is the correct option.
Moving to option B which is 6. It is an incorrect option since instead of 6 there is presence of 4 neck cells of archegonium of Dryopteris. Thus, this option is incorrect and it gets eliminated.
Moving to option B which is 8. It is an incorrect option since instead of 8 there is presence of 4 neck cells of archegonium of Dryopteris. Thus, this option is incorrect and it gets eliminated.
Moving to option B which is 2. It is an incorrect option since instead of 2 there is presence of 4 neck cells of archegonium of Dryopteris. Thus, this option is incorrect and it gets eliminated.

Thus, the correct answer is option A which is 4.

Note: A wall or a jacket of 4 vertical rows of neck cells are present in the neck of archegonium Dryopteris and because of this from all the above options A is the correct answer. There are not 6,8 or 2 vertical rows of neck cells present but there are 4 vertical rows of neck cells present in Dryopteris.