(B) Read the passage and correct the errors, wherever
present.
(a) LH stimulates follicular growth and maturation of
oocyte.
(b) Granulosa cells of developing ovarian follicle
produce progesterone.
(c) In the presence of high titre of both progesterone
and FSH, ovulation occurs.
(d) High concentration of progesterone inhibits
secretion of LH and GnRH.
Assertion & reasonIn each of the following questions, a statement of
Assertion (A) is given and a corresponding statement
of Reason (R) is given just below it. Of the statements,
mark the correct answer as :
(a) if both A and R are true and R is the correct explanation
of A
(b) if both A and R are true but R is not the correct
explanation of A
(c) if A is true but R is false
(d) if both A and R are false.
- Assertion : Progesterone is called the pregnancy
hormone, as it is essential for maintenance of
pregnancy.
Reason : It can be detected in the urine of a pregnant
woman, within a day or so of implantation.
- Assertion: The side of the blastocyst to which the
inner cell mass is attached is called animal pole.
Reason : The inner cell mass is the precursor of
embryo.
- Assertion : In neonates, there is change in respiratory
and circulatory systems.
Reason : The switchover is initiated by the gaseous
hormone, nitrous oxide (N 2 O).
- Assertion : Compatibility reaction is determined by
special proteins present over zona pellucida and sperm
surface.
Reason : They are collectively called fertilizin, in case
of sperm and anti-fertilizin, in case of egg.
- Assertion : Anaphase promoting complex (APC)
results in completion of meiosis II, and extrusion of a
second polar body.
Reason : This converts the oocyte into an ovum.
- Assertion : A calcium wave causes extrusion of
cortical granules out of the egg.
Reason : This results in modification of plasma
membrane, which changes to fertilisation membrane. - Assertion : Gestation period is the period between
fertilisation and parturition.
Reason : It is generally counted from the last menses,
and is about 40 weeks. - Assertion : Trophoblast covering secretes hormone
called human chorionic gonadotropin - HCG.
Reason : HCG maintains corpus luteum beyond
its normal life, which is called corpus luteum of
pregnancy. - Assertion : Decidua capsularis is the part of the
decidua underlying chorionic villi and overlying the
myometrium.
Reason : Decidua basalis lies between the embryo
and the lumen of the uterus. - Assertion : Capacitation occurs in the penile
urethra.
Reason : It involves changing the whiplash motion of
the sperm tail to undulating motion.
Figure Based Questions- Refer to the figure below and identify the labelled
parts - A, B, C, D, E, F, G, H and I - Fill in the blanks using the letters assigned above.
You may also use appropriate phrases, wherever
required.
(a) (i) is the outermost layer of testis, (ii) is the
middle fibrous layer, while (iii) is a network of
capillaries supported by a delicate epithelium.
(b) At the anterior end of testis, called (iv) , open the
(v).
(c) (vi) emerges from (vii) , leaves the scrotal sac,
and enters the abdominal cavity.