IDP SCHOOL, MOTERA

PERIODIC TEST -1 (2025 – 26)

Date: 02/07/2025 Std. XII BIOLOGY (044) Marks: 40

Name:__________________________________ Roll no: ______Div:_____
________
SECTION- A

Q-1: Select the correct answer of the following questions. [Each carries 1 Mark] 8M

1. Filiform apparatus in the embryo sac of an angiosperm is present at the micopylar tip of:

(a) Antipodals (b) Synergids

(c) Central cell (d) Egg cell

2. Among the terms listed below, those that are not technically correct names for a flower whorl
are:

(i) Androecium (ii) Carpel (iii) Corolla (iv) Sepal

(a) (i) and (iv) (b) (ii) and (iv)

(c) (iii) and (iv) (d) (i) and (ii)

3. The innermost wall layer of the microsporangium consisting of dense cytoplasm with more than
one nucleus is :

(a) Endothecium (b) Central cell

(c) Tapetum (d) Sporogenous tissue

4. Which of the following statements are true for spermatogenesis but do not hold true for
Oogenesis?
(i) It results in the formation of haploid gametes
(ii) Differentiation of gamete occurs after the completion of meiosis
(iii) Meiosis occurs continuously in a mitotically dividing stem cell population
(iv) It is controlled by the Luteinising hormone (LH) and Follicle Stimulating Hormone (FSH)
secreted by the anterior pituitary
(v) It is initiated at puberty
Choose the most appropriate answer from the options given below:
(a) (ii), (iii) and (v) only (b) (iii) and (v) only

(c) (ii) and (iii) only (d) (ii), (iv) and (v) only

5. Match List I with List II:

List I List II
A. Non-medicated IUD I. Multiload 375
B. Copper releasing IUD II. Progestogens
C. Hormone releasing IUD III. Lippes loop
D. Implants IV. LNG-20

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Choose the correct answer from the options given below:

(a) A-III, B-I, C-II, D-IV

(b) A-I, B-III, C-IV, D-II
(c) A-IV, B-I, C-II, D-III
(d) A-III, B-I, C-IV, D-II
6. Identify the correct option for (A), (B), (C), (D) with respect to spermatogenesis.

(a) FSH, Leydig cells, Sertoli cells, spermiogenesis.

(b) ICSH, Interstitial cells, Leydig cells, spermiogenesis.
(c) FSH, Sertoli cells, Leydig cells, spermatogenesis.
(d) ICSH, Leydig cells, Sertoli cells, spermatogenesis.
7. What are the potential drawbacks in adoption of the IVF method?

A. High fatality risk to mother

B. Expensive instruments and reagents
C. Husband/wife necessary for being donors
D. Less adoption of orphans
E. Not available in India
F. Possibility that the early embryo does not survive
(a) A, B, C, E, F only (b) B, D, F only
(c) A, C, D, F only (d) A, B, C, D only

8. Assertion: Infundibulum is a funnel-shaped part close to the ovary.

Reason: The edges of infundibulum helps in collection of the ovum after ovulation.

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true and R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false nut R is true.

SECTION- B

Q-2: Write the answer of the following questions. [Each carries 2 Marks] 6M

9. (i) Mention the function of trophoblast in the human embryo.

(ii) What is ‘placenta’?

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 OR
9. (i) What is the ploidy of primary spermatocytes and secondary spermatocytes ?
(ii) Point out one difference in first meiotic division of spermatogenesis and oogenesis.
10. Give difference: Microsporogenesis and Megasporogenesis
11. Mention one positive and one negative application of amniocentensis.
OR
11. Define: (i) Periodic abstinence
(ii) Artificial insemination
SECTION- C

Q-3: Write the answer of the following questions. [Each carries 3 Marks] 9M
12. Give any three adaptations found in wind-pollinated plants.
13. Describe the structure of the uterus wall and functions performed by any of its two layers.
OR
13. Explain the process of formation of placenta in a human female after the implantation of
the blastocyst in the endometrium of the uterus.
14. Shyam and Radha are expecting their first child with Radha being in her second month of
pregnancy with no complications. Shyam's family has a history of cystic fibrosis while Radha's
family has a history of Down's syndrome, leading to a concern that the baby may have one of
these conditions.
(a) Suggest and explain a way of testing if their baby is at risk for any genetic disorders.
(b) In case of presence of one or both of the abnormalities and posing a risk to the mother's
health, mention one possible option for them to consider. Is that option safe for Radha at the
current gestational age? Justify.
(c) Under the what condition is the process mentioned in (b) is illegal?
OR
14. A village health worker was taking a session with women. She tells them that one has to
be careful while using oral pills as a method of birth control. Wrong usage can actually
promote conception.
(a) Analyse the above statement and compare the merits and demerits of using oral pills and
surgical methods of birth control.
(b) Village women are confused as to how a thin metallic copper loop can provide protection
against pregnancy. Explain the mode of action of IUDs. Give two points.

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 SECTION- D

Q-4: Write the answer of the following questions. [Each carries 4 Marks]
12M
15. The following question is based on pollination. Study the figures carefully and answer the
questions that follow.

Figure A Figure B
(a) Give the scientific terms for the processes taking place in Figures A and B respectively.
(1M)
(b) Mention two conditions necessary for the process occurring in Figure B. (2M)
(c) (i) State one advantage and one disadvantage of the process occurring in Figure B. (1M)
OR
(c) (ii) Name one plant where, in some flowers only, the process in Figure B takes place and
give the reason responsible for it. (1M)
16. Describe in brief the structure of a mammalian spermatozoan.
SECTION- E
17. Describe the methods with figure: (i) Tubectomy (ii) Vasectomy

Q.5: Write the answer of the following questions. [Each carries 5 Marks]
5M
18. (a) (i) Explain how does double fertilisation take place in a flowering plant.
(ii) Write the fate of the products of double fertilization in these plants.
OR
(b) (i) Explain the structure of testicular lobules in human male reproductive system.
Name the two types of cells present in the seminiferous tubules and state their role.
(ii) Describe the role of hypothalamic hormone GnRH in spermatogenesis.