Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

Answers (4)

Three groups of plants that have archegonia are given below:

  • Bryophytes
  • Pteridophytes
  • Gymnosperms.

The life cycle of a pteridophyte, then it consists of two morphologically distinct phases:

(i) The gametophytic phase

(ii) The sporophytic phase.

These two phases come one after another in the life cycle of a pteridophyte and this phenomenon is called alternation of generation. The gametophyte is haploid with a single set of chromosomes. It produces male sex organs antheridia and female sex organs archegonia.

(i) The antheridia may be embedded or projecting type. Each antheridium has a single-layered sterile jacket enclosing a mass of astrocytes.

(ii) The astrocytes are flask-shaped, sessile or shortly stalked and differentiated into globular venters and tubular necks.

(iii) The diploid zygote is the first cell of the sporophytic generation. It is retained inside the archegonium and forms the embryo. 

(iv) The antherozoids after liberation from antheridium reach up to the archegonium fuse with the egg and form a diploid structure known as zygotes.

(v) The archegonium contains a large egg, which is non-motile.

Posted by

Priyanka Kumari

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Bryophyte  pteridophyte Gymnosperm

 

Posted by

Naeim

View full answer

Bryophytes,pteridophytes, gymnosperms

Posted by

Bh.nishitha

View full answer

Three groups of plants bearing archegonia are bryophytes, pteridophytes and gymnosperms. Bryophytes include species like mosses and liverworts, pteridophytes includes ferns, and gymnosperms include cycads, conifers, gingko, etc. Archegonia is a multicellular organ that acts as a female gametophyte in bryophytes and pteridophytes, but is absent in some higher gymnosperms like  like Gnetum, Ephedra and Welwitschia. Life cycle of bryophyte archegonia is as follows:

spores-->mitosis giving male(n)-->antheridium and female gametophyte(n)-->(archegonia)-->fertilization-->diploid(2n)zygote(2n)-->embyo-(2n)->sporophyte-->meiosis-->spores

Posted by

ANJALI NAGAR

View full answer

Similar Questions

Trending Articles/News

anam-khan

PM Modi's Pariksha Pe Charcha 2025 to be held next month, registrations open till January 14
anam-khan

CBSE Board Exams 2025: Online portal for availing exemptions by CWSN students opens
anam-khan

Board Exams: States agree to equivalence; no question paper ‘jumbling’ from next year, says PARAKH CEO

Latest Question