IGNOU LSE 12 2015 - Using clear and neatly labelled diagrams describe the vegetative and s

Question

Using clear and neatly labelled diagrams describe the vegetative and sexual reproduction in Marchantia.

07 Feb 2018

Answer :

Word Count : 753

Marchantia belongs to the complex thalloid group.The Marchantia thallus (plant body) is a flattened strap-like structure, 325 –925 µm thick, divided into three layers: the upper layer with pores (under a lens it can be seen to be dotted with closely crowded, whitish pores) with smooth, somewhat glossy surface, the middle layer with air pockets and chloroplast-containing cells, and the lower layer that stores carbohydrates. The thallus of Marchantia berteroana is yellow-green to green or reddish-brown, 600–900 µm thick, with branches up to 20 mm long and about 12 mm wide with wavy margins. The thallus has scales on the lower surface (ventral scales) that extend nearly to the margins, and rhizoids (hair-like structures that act as roots) with which it attaches to its substrate.

Sexual Reproduction

The sexual reproduction for leafy liverworts is very similar to the mosses. The sexual parts are contained in small and inconspicuous structures known as antheridia (male) andarchegonia (female), which develop on separate plant bodies.

In the thallose liverworts, things are a little different. For example in the Marchantia species the antheridia and archegonia are produced on an umbrella like structure. While in others species they are hidden in small pockets on the leafs

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