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प्रश्न
Name the hormones involved in regulation of spermatogenesis.
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उत्तर
Hormones that regulate spermatogenesis include GnRH, LH, FSH and androgens. After sexual maturity, spermatogenesis starts due to the secretion of gonadotropin releasing hormone (GnRH) from the hypothalamus of the brain. GnRH acts on the pituitary gland and stimulates secretion of luteinizing hormone (LH) and follicle stimulating hormone (FSH). LH induces the Leydig cells of the testis to produce male sex hormones called androgens. High levels of androgens stimulate the process of spermatogenesis. FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis.
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संबंधित प्रश्न
Briefly describe the process of spermatogenesis.
Define spermiation.
What is oogenesis?
Identify True/False statement. Correct the false statement to make it true.
Oogenesis takes place in the corpus luteum.
Describe the process of budding in hydra.
Explain the structure of secondary oocyte.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
Explain two main process in sexual reproduction.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Head of the sperm consists of acrosome and mitochondria.
(R) - Acrosome contains spiral rows of mitochondria.
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
Which of the following enter the maturation phase of oogenesis?
Which of the following events take place during spermatogenesis?
Extrusion of second polar body from egg nucleus occurs ______.
Which of the following contains a fluid filled cavity called antrum?
How many functional sperms and how many ova will be formed by a primary spermatocyte and a primary oocyte.
Cavity of graafian follicle is ______.
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called ______.
The principal tail piece of human sperm shows the microtubular arrangement of ______.
Which of the following are called dual gland?
Read the following and answer from given below:
Oogenesis is the process of the formation of an ovum in the ovaries. It consists of three phases: multiplication, growth, and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of the pituitary gland to secrete LH and FSH.
Which cell division is involved in the formation of secondary oocytes?
Aquatic animals in which fertilisation occurs in water are said to be
In the process of fertilization, this is true:
The region of the root tip whose cells undergo rapid elongation and enlargement and are responsible for the growth of the root in length is called the:
Which type of cell division forms spermatids from the secondary spermatocytes?
In spermatogenesis, at the end of the first meiotic division ______ are formed.
Meiotic division of the secondary oocyte completed ______.
The diagram given below shows the various steps in spermatogenesis.
- Name the parts labelled '1', '2' and '3'.
- Name the process by which part '3' changes to part '4'.
What is spermatogenesis?
Draw a labelled diagram of a section through the ovary.
