Tag: biology

Questions Related to biology

Menstrual cycle is not seen in ____________.

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Humans

  2. Orangutans

  3. Lemurs

  4. Chimpanzees

Show answer
Correct Option: A

What changes are observed in the uterus, if fertilisation does not occur?

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Lining of uterus becomes more thick

  2. Lining of uterus becomes more spongy

  3. Lining of the uterus slowly breaks and comes out through the vagina as blood and mucus

  4. Lining of uterus becomes more vascular

Show answer
Correct Option: C
Explanation:

If fertilization does not occur in the uterus, the corpus luteum will involute and there will be a drop in the hormone levels, which will cause the uterus to shed its lining and egg in the process called menstruation, where there is blood and uterine secretions are removed through the vagina.
Therefore, the correct answer is option C.

Unscramble the underlined words in the following sentences


The reproductive life of a woman lasts from hacreemn to spauoemen.

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Reproductive life of a woman lasts from menarche to menopause.

  2. Reproductive life of a woman lasts from nemarche to menopause.

  3. Reproductive life of a woman lasts from chenmare to pausemeno.

  4. Reproductive life of a woman lasts from chenmare to usemenopa.

Show answer
Correct Option: A
Explanation:

Menarche is the first occurrence of menstruation and marks the beginning of the reproductive period.
Menopause is the end of menstruation and marks the end of the reproductive period of women.
Therefore, the correct answer is option A.

In human females, each time during maturation and release of egg the inner wall of uterus thickens. Is this thickening permanent?

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Yes

  2. No

  3. Some times permanent

  4. Can not be decided

Show answer
Correct Option: B
Explanation:

Menstrual cycle is rhythmic reproductive cycle in which the endometrium wall of uterus forms placenta. Placenta provides nourishment to the developing fetus if implantation occurs. If pregnancy does not occur, this endometrial lining is shred off, known as menstruation. So, this endometrium thickening is not permanent.
Thus, the correct answer is option B.

Pubertal changes in girls is

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Breast development

  2. Development of gonads

  3. Menstruation

  4. All of the above

Show answer
Correct Option: D
Explanation:

Puberty is the stage at which physical changes occurs through which a child's body matures into an adult body to enable fertilization.
Pubertal changes in girls is secondary sexual characteristics which involves development of breast, pubic hair, changes in vagina, uterus and ovaries, menstruation, development of acne due to hormonal changes.
Thus, the correct answer is option D.

Ovulation in female human beings stops approximately around the age of

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. 45-50

  2. 23-25

  3. 80-90

  4. 10-15

Show answer
Correct Option: A
Explanation:

Ovulation is the process when a mature egg is released from the ovary. Then the egg is pushed down the Fallopian tube and is available to be fertilized. In females, ovulation continues after the age of 45-50 after which eggs are not released from the ovary and there is menopause.
Thus, the correct answer is option (A), '45-50'.

Which of the following is the monthly cycle in females?

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Menstruation

  2. Luteinization

  3. Oogenesis

  4. Estrogenetions

Show answer
Correct Option: A
Explanation:
  • Menstruation also is known as a monthly bleeding cycle that occurs in a female. During the period of 21-28 days oviduct, a part of the female reproductive system produces an egg in the process called ovulation. In this duration, the uterus prepares itself by increasing blood supply with arteries and veins, building a placenta to support the embryo if the egg gets fertilized by a sperm. If the egg is not fertilized the uterus starts contractions to break down the placenta. This process of rupturing the placenta from the uterus wall goes on for 3-5 days and is called menstruation. 
  • Luteinization is an early step in the formation of griffin follicles, an early stage of a mature ovum.
  • Oogenesis is a complete process by which egg/ovum is formed.
  • Estrogeniztion is the production of thick pale fluid produced by the action of estrogen during puberty in females.

State the following statement is true or false.
Menstrual cycle ceases during pregnancy.

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

If the fertilization occurs and the foetus is implanted in the endometrium, the trophoblastic cells of the developing placenta and secrete the hormone which is the human chorionic gonadotropin. This hormone, like LH, maintain the Corpus luteum and the secretion of progesterone and oestrogen by it. These two check the breakdown of the endometrium of the uterus. The absence of menstrual bleeding is the earliest sign of pregnancy. Fertilization is diploid condition and equatorial division is complete only fertilization occurs.

A female of age 24 years attained puberty at the age of 14 years. She has two children born by normal delivery. How many polar bodies are formed in her body till date?
(Each menstrual cycle is of 30 days)

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. 90

  2. 92

  3. 94

  4. 88

Show answer
Correct Option: B
Explanation:

Polar bodies are formed each monthe after attaining puberty. Hence, total years of polar bodies formation are equal to the difference between the age of puberty till date. 

Hence, total years of polar bodies formed = 24 - 14 = 10. 
Hence, total number of polar bodies formed = 10 x 12 = 120. 
She has two children born by normal delivery. 
So, 3 extra polar bodies are formed.
For one child absence of polar bodies formation = 15 months, where 9 months of gestation and 6 months of  lactation.
So, for 2 child, it will be 15 x 2 = 30.  
Hence, net polar bodies formed in her body till date - 120 + 2 - 30 = 92.
Thus, the correct answer is '92.'

In human females, the ovarian cycle begins when the 

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. levels of oestrogen reach their maximum

  2. hypothalamus stimulates the anterior pituitary to increase its output of FSH and LH

  3. level of progesterone drops precipitously

  4. hypothalamus increases its release of FSH and LH.

Show answer
Correct Option: B
Explanation:

If fertilized egg is not implanted into the uterus after the release of the matured egg, the corpus luteum degenerates and the levels of estrogen and progesterone decrease. The decrease in the level of progesterone causes the endometrium to degenerate initiating the menstrual cycle. This causes the hypothalamus to stimulate the release of GnRH, which in turn causes the release of LH and FSH from the anterior pituitary. The rising level of LH and FSH causes the growth of follicles on the ovarian surface, preparing for ovulation and thus beginning the ovarian cycle. So, the correct option is 'hypothalamus stimulates the anterior pituitary to increase its output of FSH and LH'.