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Question
In humans, archenteron is formed during __________.
[1 mark]
In humans, archenteron is formed during __________.
[1 mark]
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Solution
The correct option is A gastrulation
Archenteron is the primitive gut (archi – primitive; enteron – cavity) of an embryo at the gastrula stage. Hence option a is correct.
After fertilisation the unicellular zygote undergoes the following stages of development :
- Cleavage – Repeated divisions of the zygote to form numerous small cells called morula.
- Blastulation – Formation of blastocyst. The morula undergoes repeated divisions to form the blastula. It is a hollow sphere of cells (blastomeres) surrounding an inner fluid-filled cavity (the blastocoel).
- Implantation- Attachment of the blastocyst to the inner wall of the uterus.
- Gastrulation – Formation of the germ layers like endoderm, mesoderm and ectoderm.
- Neurulation – Formation of the neural tube, followed by the development of organs.
Archenteron is the primitive gut (archi – primitive; enteron – cavity) of an embryo at the gastrula stage. Hence option a is correct.
After fertilisation the unicellular zygote undergoes the following stages of development :
- Cleavage – Repeated divisions of the zygote to form numerous small cells called morula.
- Blastulation – Formation of blastocyst. The morula undergoes repeated divisions to form the blastula. It is a hollow sphere of cells (blastomeres) surrounding an inner fluid-filled cavity (the blastocoel).
- Implantation- Attachment of the blastocyst to the inner wall of the uterus.
- Gastrulation – Formation of the germ layers like endoderm, mesoderm and ectoderm.
- Neurulation – Formation of the neural tube, followed by the development of organs.
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(a) About 300 million spermatozoa may be present in a human male ejaculation at one time. Calculate how many spermatocytes will be involved to produce this number of spermatozoa.Join BYJU'S Learning Program
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