Question

The moss plants are characterised by
(a) Presence of stem-like and leaf-like
(b) Absence of vascular tissue
(c) A filamentous juvenile gametophyte
(d) All the above

Answer 1

Hint: Mosses are a group of bryophytes which does not have a vascular system and it lives in moist habitat. It is more developed than the thallophyta group of plants but shows less development as compared to Pteridophyta and higher plants.

Complete answer:
Bryophyta is also known as a moss plant that does not have the true stem, roots and leaves but shows root-like, stems-like and leaf-like structure. It is also known as amphibian of the plant kingdom because the sperm of antheridium swim in the water to reach the archegonia for fertilization. Fertilization produces diploid zygote which later gets developed into an embryo and then to the sporophyte. Due to the absence of vascular tissue, the conduction of water takes place from cell to cell by diffusion and the plant absorbs water and minerals directly from the ground or atmosphere therefore they are present only in moist places. The dominant phase of the bryophyte is the gametophyte which consists of green thallus with sex organ and gametes. The sporophytic generation consists of multicellular spores producing sporogonium, which depend on gametophytic generation for nutrition and support. The capsular part of sporophyte produces haploid spores by meiosis which on germination produces gametophyte directly through juvenile filamentous protonema stage.

So, the correct answer is 'All the above'.

Note:
Mosses are generally the smallest plant which grows around 15cm in height, the smallest moss plant is Hymenodontopsis bifaria which is known as mini moss and the only tallest plant under mosses is Dawsonia, which grows around 60cm in height and found only in New Zealand.