Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why ?
Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why ?
| Spermatogenesis | Oogenesis |
| $(1)$ The process of formation of sperms occur in mature age | $(1) $ Oogonia are formed before birth. |
| $(2)$ Sperms are produced in lakhs of amount at a time. | $(2)$ Each month at a time only one ovum is produced. |
| $(3)$ After two complete meiotic division four cells are produced of similar type and size. | $(3)$ Pre phase $-1$ During this meiosis $1$ is prevented and in large cell with cytoplasm and there small cells are produced. |
| $ (4)$ They mature into flagellated and motil cell. | $(4)$ Mature ovum is nonflagellated and nonmotile. |
It makes ovum larger than the remaining three polar bodies by unequal mitotic division because there are many organelles and cytoplasm in ovum. It has many chances for rescue.
Male produces sperms in lakhs of amount while female produces only one ovum in each month and it waits for time before fertilisation for second meiotic division.
Sperm is small and motile because it has to move from male reproductive system to female reproductive system. There is abundant stored food in large ovum so it develops immediately after fertilisation.
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In testis, the immature germ cells produce sperm by $...A...$ at puberty $...B...$ present on the inside wall of seminiferous tubules multiply by$ ...C..$. division and increase their number. Identify $A$,$B$ and $C$ from the above statement
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When male ejaculates sperms during coitus of which for normal fertility at least....... percent sperms must have normal shape and size and at least ...........per cent of them must show vigorous motility
When male ejaculates sperms during coitus of which for normal fertility at least....... percent sperms must have normal shape and size and at least ...........per cent of them must show vigorous motility
Match the columns.
Column $I$
Column $II$
$(a)$
Mens pubis
$(1)$
Embryo development
$(b)$
Antrum
$(2)$
Sperm cell
$(c)$
Trophoblast layer
$(3)$
External genitals offemale
$(d)$
Mitochondria
$(4)$
Graafian follicle
Match the columns.
| Column $I$ | Column $II$ | ||
| $(a)$ | Mens pubis | $(1)$ | Embryo development |
| $(b)$ | Antrum | $(2)$ | Sperm cell |
| $(c)$ | Trophoblast layer | $(3)$ | External genitals offemale |
| $(d)$ | Mitochondria | $(4)$ | Graafian follicle |
Describe the process of spermatogenesis with labelled diagram.
Describe the process of spermatogenesis with labelled diagram.