00:01
So, in the question it has been given that among the following, which phylum has two embryonic tissue layer.
00:09
Now let us understand what is this.
00:11
So during embryogenesis, okay, that is the formation of embryo, we see that in the gastrulation stage this germ layer is formed.
00:24
Now this germ layer gives rise to tissues ultimately, this is a tissue layer.
00:30
This is divided into two types is germ layer formation the number one is diploblastic diplo from the name you can understand di means two so here you will find two tissue layer and then the other one is tripleblastic okay that means you will have three tissue layer here in case of the diploblastic animals we have the outer ectoderm and we have the inner endoderm in case of tripleblastic animals we see we have the outer ectoderm inner endoderm and in addition to this there is also another layer which is in the middle which is called as the mesoderm so this tripleoblastic stage okay this starts from the phylum platyhelmynthis and above platyhelmethis and above beyond you can say above rather higher phyeloms and below platyhelmethis we find the diploblastic stage.
01:31
So, in which phylum among the given option do we see it? we see it under niederia.
01:36
Now, in the option, okay, you have a platty helmynthis, nematoda, nidaria, podifera, rottifera.
01:47
So as i said that from phylum, plattie helmynthes to higher phylam, they will have triplastic...