HOW DO ORGANISMS REPRODUCE

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summary of the chapter for class ten.

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HOW DO ORGANISMS REPRODUCE?:

HOW DO ORGANISMS REPRODUCE? BY, H.SATHISH KUMAR, CLASS X, RICE – MMS.

REPRODUCTION::

REPRODUCTION:

TYPES OF REPRODUCTION::

TYPES OF REPRODUCTION:

ASEXUAL MODE::

ASEXUAL MODE:

Binary Fission: :

Binary Fission:

Budding: :

Budding:

Vegetative propagation: :

Vegetative propagation:

Spore Formation::

Spore Formation:

Sexual Reproduction::

Sexual Reproduction:

Sexual Reproduction in Plants::

Sexual Reproduction in Plants:

Sepals::

Sepals: Green leaf like structure.

Petals::

Petals:

Male Reproductive Organ of Plant: Androecium:

Male Reproductive Organ of Plant: Androecium

Female Reproductive Organ of Plant: Gynoecium:

Female Reproductive Organ of Plant: Gynoecium

Pollination::

Pollination:

Zygote Formation::

Zygote Formation:

Reproductive System in Humans::

Reproductive System in Humans: Male Reproductive System: 1. Testis: Testis is a galndular organ made up of fine tubules. Testis produces sperm or male gamete. 2. Seminal Vesicle: Once sperm is produced it is stored in seminal vesicle. 3. Vas Deferens: Vas deference is the tube through which semen containing sperm is transferred out.

Male Reproductive System::

Male Reproductive System: Apart from producing sperm, testis also produces certain hormones, like tetosterone which are responsible for secondary sexual characters in humans. These are deep male voice, hair growth in pubic area and under armpits, and facial hair.

Female Reproductive Organs::

Female Reproductive Organs: 1. Ovary: Ovaries are situated on left and right side of the uterus. Ovaries have an inner epithelial lining called endometrium , which is responsible for the production of eggs. 2. Fallopian Tubes: Fallopian tubes extends on both sides of the uterus in transverse direction. Fallopian tubes have finger like structures which catch the eggs to transfer them to the uterus. 3. Uterus: Uterus is a bag like structure, with an opening in the vagina. Once eggs reach uterus, a layer of soft tissues develops to support the embryo. This layer is called corpus luteum . If fertilization takes place, then the embryo develops into a foetus and ultimately to a fully developed child over a period of about 9 months.

Menstrual Cycle in Females::

Menstrual Cycle in Females: If no fertilization takes place then after about two weeks the dead eggs and corpus luteum gets expelled out of the uterus through vagina. This process takes place over a period of about three to four days. This clears the way for new batch of eggs to come in the uterus. The whole cycle from egg production to the expulsion of eggs takes about four weeks. This cycle is known as Menstrual Cycle. Apart from humans, some primates like Chimpanzee and Gorilla also show same phenomenon.

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