CBSE Questions for Class 12 Medical Biology Human Reproduction Quiz 11 - MCQExams.com

1. During the age between 40-50 years, women undergo the stage of Menopause. 
2. Menopause is the period where a woman's body stops menstruating (menstrual cycle). 
3. Women are born with finite number of eggs in their ovaries. One of each egg is released each month due to which menstrual cycle occurs.
4. Once all the eggs stored in the ovaries are over, woman stops menstruating and this stage is called menopause.

• Testosterone is one of the hormones amongst a group of hormones known as androgens. It is the primary sex hormone produced by males. 
• Testosterone maintains typically male characteristics of the body (e.g. facial hair). It fulfills important functions for both men and women, most prominently in regulating the sex drive. 
• In men, testosterone production commences at puberty, when the pituitary gland in the brain begins producing hormones called follicle-stimulating hormone (which primarily stimulates sperm production) and luteinizing hormone (LH). 
• LH is the hormone that stimulates a man’s testes to produce testosterone. Cells in the testes are called interstitial or leydig cells to produce testosterone in response to the production of LH. Some 95% of a man’s testosterone is produced by leydig cells.

• From the testis, sperms are collected by the vasa efferentia which transfer them to the epididymis through rete testis.
• Vasa efferentia open in the anterior end of testis which is known as caput epididymis. The middle part is known as corpus epididymis and posterior part is known as cauda epididymis. Sperms pass all these parts of the epididymis and take several days.
• From the cauda epididymis arises the vas deferens which ascends to abdomen and passes over the urinary bladder. The duct from the seminal vesicle joins the vas deferens behind the urinary bladder and form the ejaculatory duct.
• The ejaculatory duct passes through the prostate and open into urethra after its origin from the urinary bladder.

A.Ureter - The duct by which urine passes from the kidney to the bladder or cloaca. It is tube like, carries spermis from epididymis towards urethera.

B.Vas deference – They are a pair of uncoiled straight tubes, each arising from cauda epididymis.

C.Seminal vesicles – They are a pair of contorted, musculoglandular sacs, which coccur between urinary bladder and rectum.

Correct Option: D

Explanation:

• From the 7th day onward till the 14th day it is considered the proliferative phase. 

• Here follicles development occurs.

• Ovulation occurs at the end of the proliferative phase.

• On ovulation, the egg is released, and LH surge is maximum.

• When the egg is not fertilized, the corpus luteum degenerates and becomes corpus albican. This phase is the secretory phase.

• After 14days of ovulation again the menses occurs and the cycle is repeated.

Hence, ovulation occurs at the end of the proliferative phase.