schematic representation of the life cycle in ferns and Marchantia?
Answers
Explanation:
Diagram) | Hepaticopsida
(ii) Diploid Phase or Sporophytic Phase: In Marchantia sporophyte is represented by foot, seta and capsule. The sporophyte produces the spores in the capsule. The spores on germination produce the gametophyte. So, in Marchantia two morphologically distinct phases (Haplophase and Diplophase) constitute the life cycle.
Answer:
The plant body is gametophytic, thalloid, flat, prostrate, plagiotropic, 2-10 cm. long and dichotomously branched Dorsal surface is dark green. It has a conspicuous midrib and a number of polygonal areas called areolae. The midrib is marked on the dorsal surface by a shallow groove and on the ventral surface by a low ridge. Each polygonal area re-presents the underlying air chamber. The boundaries of these areas represent the walls that separate each air chamber from the next. Each air chamber has a central pore. The midrib ends in a depression at the apical region forming an apical notch in which growing point is situated Dorsal surface also bears the vegetative and sexual reproductive structures. The vegetative reproductive structures are gemma cup and develop along the midrib. These are crescent shaped with spiny or fimbriate margins and are about one eighth of a inch in diameter Sexual reproductive structures are borne on special Stalked structures called gametophores or gametangiophores. The gametophores bearing archegonia are called archegoniophores and that bearing antheridia are called antheridiophores