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प्रश्न
Give scientific reason.
There is a menopause when women are 45-50 years old.
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उत्तर
- The natural cessation of menstruation that occurs between the age of 45-50 years is known as menopause.
- Menopause occurs as the secretion of hormones controlling the functions of the female reproductive system either stops or becomes irregular.
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संबंधित प्रश्न
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
The glandular accessory organ which produces the largest proportion of semen is ____________.
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.
During spermatogenesis, spermatogonium grows in size to become ______.
The secondary oocyte enter into the fallopian tube through the ______.
Find out the CORRECT sequence of spermatogenesis.
Middle piece of mammalian sperm possesses ______.
Acrosome reaction in sperm is triggered by ______.
Sertoli cells are found in ______.
There is no cell division involved in ______.
Connective tissue around seminiferous tubules possess endocrine cells called ______.
The cell which undergoes meiosis I during spermatogenesis is the ______.
Preparation of sperm before penetration of ovum is ______.
Which of the following groups of cells in the male gonad, represent haploid cells?
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?
Germ cells present in the seminiferous tubules undergo ______
During spermatogenesis meiosis occurs in ______.
