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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
With the help of diagrammatic representation, explain the process of gametogenesis
Draw a labelled diagram of sperm.
Identify True/False statement. Correct the false statement to make it true.
Oogenesis takes place in the corpus luteum.
Fill in the blank.
---------- type of reproduction occurs without fusion of gametes.
Explain the structure of secondary oocyte.
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
If one pollen grain produces two male gametes, how many pollen grains are needed to fertilize 10 ovules?
The process which the sperm undergoes before penetrating the ovum is ____________.
Answer the following type of question Assertion (A) and Reason (R).
(A) - In human males, testes are extra-abdominal and lie in scrotal sacs.
(R) - Scrotum acts as a thermoregulator and keeps the temperature lower by 2°C for normal sperm production.
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.
Mention the differences between spermiogenesis and spermatogenesis.
At what stage of development are the gametes formed in newborn male and female?
Draw a labeled sketch of a spermatozoan.
Define gametogenesis.
Which is the correct order of steps occurring during spermatogenesis?
Which of the following contains a fluid filled cavity called antrum?
During oogenesis, each diploid cell produces ______.
Which of the following is a primary sex organ of female?
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?
The number of chromosome groups at the equatorial plate in metaphase-I of meiosis in a plant with 2n = 50 shall be:
Human milk differs from cow's milk because human milk contains:
Which of the following cells during gametogenesis is normally diploid?
Germ cells present in the seminiferous tubules undergo ______
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
The mother germ cells are transformed into a mature follicle through series of steps. Provide the missing steps in the blank boxes.
Process of maturation and development of sperms ______.
Name the germinal layers from which the following organs develop: Tongue, heart, sweat glands, vagina, mammary glands, kidney.
Sketch and label the process of oogenesis.
Complete the analogy with respect to the structure of sperm.
Nebenkern : ‘X’ : : Acrosome is formed from : ‘Y’
