Which order of types of cells below correctly reflects the sequence by which a sperm cell is produced?

1.     Spermatogonium A

2.     Spermatogonium B

3.     Primary spermatocyte

4.     Secondary spermatocyte

5.     Spermatid

6.     Sperm cell (spermatozoon)

The process from the formation of spermatogonium up to and including the secondary spermatocyte is called spermatocytogenesis.

The continuing process which includes maturation of the sperm cell, from the spermatid phase to the mature sperm cell is called spermiogenesis.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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