Question

Gastrula has a pore known as
(a)Zoospore
(b)Oospore
(c)Gonopore
(d)Blastopore

Answer 1

The embryo undergoes changes when going through the process of development, it changes from blastula stage to gastrula stage. This process is known as gastrulation. It occurs in the third week of gestation. During this period major changes like formation of germ layers and appearance of major body apex occurs.

Complete answer:
Blastopore is found in the gastrula. It is the pore which leads to the development of gastrula by forming an opening into the developing embryo or gastrula. In the protostome the blastopore develops into the animal's mouth and in the deuterostome the blastopore develops into the animal's anus. In amniotes blastopore is an opening into the archenteron. An archenteron then develops into endoderm and mesoderm.

Additional Information: -Zoospores are asexually produced spores which are motile in nature. They use flagella for motion. They usually lack a defined cell wall. Protists, bacteria and fungi use zoospores to propagate themselves. Zoospores are also called swarm spores.
-Oospore is a fertilized female zygote. It has thick walls made up of chitin. It develops from the fertilized oosphere in some algae and fungi.
-There are various factors involved in the controlling of gastrulation like fibroblast growth factor 8 (FGF8).
-Gastrulation forms germ layers which are endoderm, mesoderm and ectoderm.
-Ectoderm gives rise to the CNS, epidermis, eyes and many connective tissues of the head.
-Endoderm gives rise to the respiratory, digestive and gastrointestinal tracts.
-Mesoderm gives rise to all skeletal muscles, connective tissues, blood cells, lining of blood vessels, reproductive and urinary tract.
So the correct answer is ‘blastopore.'

Note: Blastulation is a process in which two layered embryos are formed by rearrangement of blastomeres whereas, in gastrulation the germ layers get differentiated. Blastula is known as pre-embryo and gastrula is known as the mature-embryo. The period of gastrulation ends when the blastocoel disappears completely.