Question

There are 14 chromosomes in the leaf cell of a pea plant. How many chromosomes will be there in male gamete produced by the pea plant and also name the type of cell division involved in the formation of male gamete? *
number of chromosomes in male gamete will be 28 by the process of mitosis

number of chromosomes in male gamete will be 7 by the process of mitosis

number of chromosomes in male gamete will be 28 by the process of meiosis

number of chromosomes in male gamete will be 7 by the process of meiosis

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Answer 1

Explanation:

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Human female reproductive system

All organs of female reproductive

system are in abdominal cavity. It

includes a pair of ovaries, a pair of

oviducts, single uterus and a vagina.

Besides, a pair of Bartholin's gland is

also present.

Generally, every month, an ovum

is released in abdominal cavity

alternately from each ovary. Free end

of oviduct is funnel-like. An opening

is present at the center of it. Oocyte

enters the oviduct through that

opening. Cilia are present on inner

surface of oviduct. These cilia push

the oocyte towards uterus.

Surprising Facts

1. Length of each epididymis is about 6

meters.

2. Length of a sperm is about 60 micrometers.

3. Such a small sperm has to cross the distance

of approximately 6.5 meter while passing

out of male reproductive system.

4. Sperm needs large amount of energy. For

this purpose, fructose is present in the

semen.

Gamete Formation

Both gametes i.e. sperm and ovum are formed by meiosis. Sperms are produced in

testes of men from beginning of maturation (puberty) till death. However, in case of women,

at the time of birth, there are 2 – 4 million immature oocytes in the ovaries of female

foetus. An oocyte matures and is released from ovary every month from the beginning of

maturity up to the age of menopause (approximately 45 years of age). Menopause is the

stoppage of functioning of female reproductive system. At the age of about 45 – 50 years,

secretion of hormones controlling the functions of female reproductive system either stops

or becomes irregular. This causes the menopause.

Uterus

Vagina

Ovary

Oviduct

3.17 Human female reproductive system

Fertilization

Formation of zygote by union of sperm and ovum is called as fertilization. Fertilization

is internal in humans. Semen is ejaculated in vagina during copulation. Sperms, in the

numbers of few millions start their journey by the route of vagina – uterus – oviduct. One

of those few million sperms fertilize the only ovum present in the oviduct.

From the age of puberty up the menopause (from 10 – 17 years of age up to 45 – 50

years), an ovum is released every month from the ovary. i.e. out of 2 – 4 million oocytes,

approximately only 400 oocytes are released up to the age of menopause. Remaining

oocytes undergo degenera