PM SHRI KENDRIYA VIDYALAYA PANISAGAR
MT-II (2024-25)
Maximum Marks : 40 Marks Time: 90 Minutes
BIOLOGY(044) Class:XII
General instructions:-
All questions are compulsory.
The question paper has five sections and 19questions.
There is no overall choice.However, internalchoices have been
provided in some questions. A student has to attempt only one of the
alternatives in such questions.
Wherevernecessary, neat and properly labelled diagrams should be
drawn.
Q. Questions Marks
No.
SECTION -A
1. _______ is a lytic enzyme released by the sperm. 1
a. Hyaluronidase
b. Trypsin
c. Helicase
d. None of the above
2. Which of the following statement is incorrect : 1
a) GnRH stimulates secretion of LH and FSH.
b) LH stimulates the leyding cells to secrete androgens.
c) FSH acts on the sertoli cells and stimulates spermiogenesis.
d) None of the above
3. Choose the correct sequence of hormone secretion from 1
beginning of menstruation
a) FSH, Progesterone, Estrogen
b) Estrogen, FSH, Progesterone
c) FSH, Estrogen, Progesterone
d) Estrogen, Progesterone, FSH
4. 1
. What is the expansion for MTP?
a. Medical Termination of Parturition
b. Mechanical Transfer of Pollen
c. Medical Termination of Pregnancy
d. Maternally Transmitted Pathogens
5. An IUD that is recommended to supress sperm motility and the fertilising 1
capacity of sperm is :
a) Lippe’s loop
b) LNG 20
c) Progestasert
d) Multiload 375
6. Assertion:In IVF fertilisation is done inside the body of women. 1
Reason:Zygote upto 8 blastomere can be transferred into the fallopian tube.
a) Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct
explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are the true but Reason (R) is not a
correct explanation of Assertion (A).
(c) Assertion (A) is true and Reason (R) is false.
(d) Assertion (A) is false and Reason (R) is true.
7. 1
Which part of the female reproductive system remains blocked after
tubectomy?
a. Fallopian tube
b. Cervix
c. Uterine cavity
d. None
8. Assertion: Follicle stimulating hormone controls the maintenance and 1
functions of male reproductive organs.
Reason: FSH directly acts on spermatogonia to stimulate sperm production a)
Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct
explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are the true but Reason (R) is not a
correct explanation of Assertion (A).
(c) Assertion (A) is true and Reason (R) is false.
(d) Assertion (A) is false and Reason (R) is true.
SECTION B
9. When and where chorionic villi appear in humans? State their function. 1+1
10. Describe lactational amenorrhea method of birth control. 2
11. List the names of the hormones, endocrine glands along with functions of the 1+1
hormones that are crucial in causing spermatogenesis.
SECTION C
12. Draw a sectional view of seminiferous tubule of human male. 3
13. Expand and explain the following techniques used in test tube baby 1×3=3
programme.
A. GIFT
B. ZIFT
C. IUI
14. Draw a labelled diagram of ovule. 3
15. What is the main objective of “Assisted Reproductive Technology” 1x3 = 3
programme?
SECTION D
16. 4
Intra uterine devices are most widely accepted methods of
contraception .These are used by females the uterus through vagina.
However these devices are not recommended for those who eventually
intend
1. How does CuT prevent conception?
a)Copper ions Make uterus unsuitable for implantation.
b)Copper ions Make cervix hostile to the sperms.
c) Copper ions suppress sperm motility
d)Copper ions inhibit ovulation
2. Which of the following IUDs makes uterus unsuitable for implantation ?
A)LNG-20.
b)Multiload 375.
c) Cu7.
d)Lippes loop
3. Identify the correct statement for IUDs
a)They slowly release Synthetic progesterone in the body
. b) They increase Phagocytosis of sperms within the uterus.
c) The block entry of sperms through the cervix.
d). Both b and c
4. Select the correct matched pair
a). Hormone releasing IUD - LNG 20
b). Non medicated IUD. – Progestasert
c). Copper releasing IUD. - Lippes loop
d) none of these
SECTION E
17. The mature ovum or a female gamete is spherical in shape. The human ovum 5
is almost free of yolk and is said to be alecithal. Human ovum loses its ability X3=15
to fertilize about 24 hours after ovulation. Refer to the given structure of
ovum and answer the following questions-
(i) Thick cellular layer formed of radially elongated follicular cells is-
(a) Zona pellucid
(b) plasma membrane
(c) perivitelline space
(d) corona radiata
(ii) In humans, at which stage does ovum get released from ovary?
(a) Secondary oocyte
(b) Oogonium
(c) primary oocyte
(d) First polar body
(iii) Cytoplasm of ovum is enveloped by-
(a) Zona pellucida
(b) corona radiata
(c) cell membrane
(d) perivitelline space
(iv) Select the correct option a,b,c
a Cytoplasm, Zona pellucida ,Plasma membrane
b Cortical granules ,Corona radiata ,Zona pellucida
c Cortical granules ,Plasma membrane ,Corona radiate
d cytoplasm, Corona radiate, Zona pellucida
(v) Which of the following is not a characteristic of ovum?
(a) Nucleus of ovum has prominent nucleolus
(b) Only one ovum is formed from one oogonium.
(c) It lacks centrioles
d) It has very small amount of ooplasm
18. The first menstruation is called menarche that usually occurs
between 12 and 15 years. In human females, menstruation is repeated at
an average interval of about 28/29 days and is called menstrual cycle. It is
regulated by certain hormones, as pituitary gland is stimulated by
releasing factors produced in hypothalamus. The hormones produced by
pituitary gland influence the ovaries. The hormones secreted by the
ovaries affect the walls of uterus.
(i) The breakdown of endometrium is characteristic of-
(a) Proliferative phase
(b) luteal phase
(c) ovulatory phase
(d) menstrual phase
(ii) Which days of the menstrual cycle marks the proliferative phase?
(a) 1-5 days
(b) 15-28 days
(c) 6-13 days
(d) 10-14 days
(iii) Which of the following occurs during secretory phase?
(a) Empty Graffian follicle changes into Corpus luteum.
(b) Primary follicle changes into Graffian follicle
(c) Endometrium rebuilds and estrogen secretion increases.
(d) LH surge inducing release of ovum.
(iv) Identify the hormones that attain peak level during ovulatory phase-
(a) FSH
(b) Progesterone
(c) LH
(d) Both a & c
(v) Withdrawal of which hormone causes degeneration of corpus luteum?
(a) FSH
(b) LH
(c) Progesterone (
d) Estrogen
