Menstrual Cycle

Q.

What Is a Graafian follicle in the ovary?

Q.

Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?

1. Graafian follicle

2. Fetus

3. Corpus luteum

4. Uterus

Q.

What is the function of ovary?

Q. Spermatogenesis starts at the age of puberty due to significant increase in the secretion of

1. GnRH from posterior pituitary gland
   
2. GnRH from hypothalamus
   
3. GnRH from anterior pituitary gland
   
4. Somatostatin from hypothalamus
   

Q.

If a female has the menstrual cycle of 34 days what is the date of ovulation.

17 day

14 day

20 day

5 day

Q. If mammalian ovum fails to get fertilised, which one of the following is unlikely?

1. Corpus luteum will disintegrate
2. Oestrogen secretion further decreases
3. Primary follicle starts developing
4. Progesterone secretion rapidly declines

Q.

In which among the following set of animals, show oestrus cycle?

1. Sheep, ape and man

2. Cow, sheep, rat, deer, dog, tiger

3. Monkey, ape and man

4. Cow, monkey, ape, man, dog

Q.

What do you mean by spermiogenesis and spermiation?

Q.

What is sex-linked inheritance? Give two examples.

Q. The persistence of corpus luteum during pregnancy is due to the presence of hormone

1. Testosterone
2. LH
3. Chorionic Gonadotropin
4. FSH

Q. A large number of primary follicles degenerate during the phase from birth to puberty. Therefore, at puberty each ovary has about

1. 1 million primary follicles
2. A couple of million primary follicles
3. 60, 000–80, 000 primary follicles
4. 1, 20, 000–1, 60, 000 primary follicles

Q. No new follicles develop in the luteal phase of the menstrual cycle because

1. follicles do not remain in the ovary after ovulation
2. FSH levels are high in the luteal phase
3. LH levels are high in the luteal phase
4. both FSH and LH levels are low in the luteal phase

Q.

GnRH is secreted by ___________and it stimulates anterior pituitary to release_______.

1. hypothalamus, oxytocin
2. hypothalamus, FSH and LH

3. posterior pituitary, FSH and LH

4. hypothalamus, vasopressin

Q.

The complication of the STDs includes

a.PID
b.Abortions
c.Still birth
d.Ectopic pregnancies
e.Infertility
f.Cancer of reproductive tract

1. All of the above
2. a, b, c, d, e and f
3. a, b, c, d and e
4. a, b, c and d

Q. Glans penis is covered by a loose fold of skin called

1. Both A and C
2. Prepuce
3. Hindskin
4. Foreskin

Q. Name the component cells of the ‘egg apparatus’ in an embryo sac.

Q. With a neat, labelled diagram, describe the parts of a mature
angiosperm embryo sac. Mention the role of synergids.

Q. Oogenesis is a complex process regulated by various hormones. Which hormone acts on primary follicles and stimulate its conversion into mature Graafian follicles?

1. GnRH
2. Estrogen
3. FSH
4. Progesterone

Q. Vasa recta is absent or highly reduced in–

1. Cortical nephrons
2. Juxta medullary nephrons
3. Peritubular capillaries
4. Both $\left(1\right)$ and $\left(2\right)$

Q. Which of the following statements are true about HIV?

i) HIV can be transmitted through body fluids.
ii) HIV can be transmitted by sharing food with the infected person.
iii) HIV can be transmitted by infected needles.
iv) HIV can be transmitted by hugging an infected person.

1. 1, 2, 3
2. 1, 4
3. 2, 4
4. 1, 3

Q. Name the hormones involved at each stage of the following flow chart.

1. 1- GnRH, 2 - LH, FSH
2. 1- GnRH, 2 - LH, ABP
3. 1- LH, 2 - FSH, GnRH
4. 1- FSH, 2 - LH, GnRH

Q.

What is the cause of hemophilia and color blindness?

Q. Which of the following is a parameter of senescence or old age?

1. Slowing of metabolism
2. The end of juvenile phase
3. The end of reproductive phase
4. Both A and B

Q. The reproductive phase in female has changes that are dictated by regular changes in

1. hormones
2. enzymes
3. anatomy of reproductive structures
4. all somatic cells

Q. Assertion: Small disc-shaped structures at the surface of the centromeres are called kinetochores.
Reason: Kinetochores serve as the sites of attachment of spindle fibres to the centromeres.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are false.
3. Assertion is true but reason is false.
4. Both assertion and reason are true and the reason is not the correct explanation of the assertion.

Q. In case of no pregnancy, what is the fate of the corpus luteum?

1. Remains as it is due to the presence of progesterone
2. Degenerates in a short time
3. Becomes active and secretes a lot of FSH and LH
4. Produces a lot of oxytocin and relaxin

Q. [5]
(a) Explain menstrual cycle in human females.

(b) How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure ?

Q.

The gonadotropin releasing hormone (GnRH) released by the _____(i)_____stimulates the ___(ii)______ to release ___(iii)______ and _____(iv)______. The LH stimulates the Leydig cells to produce____(v)______.

1. (i) hypothalamus (ii) pituitary (iii) LH (iv) FSH (v) testosterone

2. (i) hypothalamus (ii) pituitary (iii) FSH (iv) estrogen (v) testosterone

3. (i) pituitary (ii) hypothalamus (iii) LH (iv) FSH (v) testosterone

4. (i) hypothalamus (ii) pituitary (iii) LH (iv) testosterone (v) FSH

Q. A woman who has lower level of sex hormones than normal will have:

1. Uterus size larger than normal
2. Normal uterus size
3. Irreversibly dysfunctional uterus
4. Uterus size smaller than normal
   

Q. Do you justify the statutory ban on amniocentesis in our country? Give reasons.