Question

Choose the incorrect statement from the following regarding bryophytes:

• A. Liverworts have male and female sex organs on the same thallus
• B. The male and female sex organs are mostly on the same thallus in mosses
• C. Gemmae cups, protonema and archegonium are haploid
• D. Spore mother cells and zygote are diploid

Answer 1

The correct option is A Liverworts have male and female sex organs on the same thallus

Bryophytes are classified into liverworts and mosses.

Liverworts, like Marchantia, are thalloid, dioecious, multicellular, photosynthetic organisms. Dioecious means that male and female sex organs are present on different thallus. The male and female plant is known as antheridiophore and archegoniophore, respectively.

Mosses, like Funaria, are monoecious. The male and female are found on the same plant at tips of the leafy shoots.

Gemmae cups in liverworts, protonema in mosses and archegonium in both mosses and liverworts are structures formed on the gametophyte by mitosis. As the gametophyte is haploid, hence, all these structures are haploid.

The zygote is diploid and it develops into sporophyte by mitosis. Spore mother cells are present on the sporophyte and are diploid too.