00:01
So, here we have to compare the life cycle of mosses, ferns, gymnosperms and angiosperms.
00:13
Gymnosperms and angiosperms, these are the four major plant groups.
00:19
So, firstly if we talk about the life cycle of mosses, mosses are basically coming under the group of bryophytes and mosses basically show alternation of generation.
00:34
In fact, all these plants, they will show alternation of generation in which during some part of their life cycle, they will show a gametophytic stage.
00:47
So gametophyte will be there, while in other parts of their life, they will be converted into a sporophytic phase or sporophyte and the mosses, they basically reproduce through spores and the dominant generation or in the major part of their life cycle, they will be present in the form of a gametophyte and this gametophyte is basically haploid or having n number of chromosomes while the sporophyte is diploid having 2n number of chromosomes.
01:22
So, gametophyte is dominant and it is basically the photosynthetic stage.
01:29
This gametophyte will perform photosynthesis and attached to this gametophyte will be present a small sporophyte which is not the dominant stage and mosses require water for fertilization.
01:47
So, water is required for the process of fertilization.
01:53
That is why they are called amphibians of the plant kingdom.
01:57
They don't have any vascular tissue.
02:00
So no vascular tissue is present.
02:06
Also they do not show any seed development.
02:09
So seeds are also not present.
02:12
Now moving on to the next one which is ferns.
02:17
So ferns are basically pteridophytes.
02:23
These are pteridophytes and if we talk about ferns, they also show alternation of generation.
02:35
So alternation of generation is present.
02:40
Then they also reproduce via spores.
02:45
Now one difference which is present in these is that they contain vascular tissue.
02:53
These are the first plants which showed the presence of vascular tissue.
02:57
So vascular tissue is present.
02:59
Moving on, the dominant part of the life cycle is not the gametophyte rather it is the sporophyte and these ferns, they also require water for fertilization because the sperm will flow in the water only to reach into the egg.
03:22
So water is required for fertilization...