Tamil Nadu Board 12th Standard Bio-Zoology - Chapter 3: Book Back Answers and Solutions
This post covers the book back answers and solutions for Chapter 3 – Bio-Zoology from the Tamil Nadu State Board 12th Standard Bio-Zoology textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Bio-Zoology Chapter 3 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 12 students! Prepare well and aim for top scores. Thank you!
Chapter 3: Reproductive Health
I. Multiple Choice Questions
(a) Gonorrhoea is a STD whereas others are not.
(b) Trichomoniasis is a viral disease whereas others are bacterial.
(c) HIV is a pathogen whereas others are diseases.
(d) Hepatitis B is eradicated completely whereas others are not.
Answer Key:
(c) HIV is a pathogen whereas others are diseases.
2. Which one of the following groups includes sexually transmitted diseases caused by bacteria only?
(a) Syphilis, gonorrhoea and candidiasis
(b) Syphilis, chlamydiasis and gonorrhoea
(c) Syphilis, gonorrhoea and trichomoniasis
(d) Syphilis, trichomoniasis and pediculosis
Answer Key:
(b) Syphilis, chlamydiasis and gonorrhoea
3. Identify the correct statements from the following
(a) Chlamydiasis is a viral disease.
(b) Gonorrhoea is caused by a spirochaete bacterium, Treponema palladium.
(c) The incubation period for syphilis is is 2 to 14 days in males and 7 to 21 days in females.
(d) Both syphilis and onorrhea are easily cured with antibiotics.
Answer Key:
(d) Both syphilis and onorrhea are easily cured with antibiotics.
4. A contraceptive pill prevents ovulation by
(a) blocking fallopian tube
(b) inhibiting release of FSH and LH
(c) stimulating release of FSH and LH
(d) causing immediate degeneration of released ovum
Answer Key:
(b) inhibiting release of FSH and LH
5. The approach which does not give the defined action of contraceptive is
|
(a)
|
Hormonal
contraceptive
|
Prevents
entry of sperms, prevent ovulation and fertilization
|
|
(b)
|
Vasectomy
|
Prevents
spermatogenesis
|
|
(c)
|
Barrier
method
|
Prevents
entry of sperms, prevent ovulation and fertilization
|
|
(d)
|
Intra
uterine device
|
Increases
phagocytosis of sperms, suppresses sperm motility and fertilizing capacity of
sperms
|
(b) Vasectomy Prevents spermatogenesis
6. Read the given statements and select the correct option.
Statement 1: Diaphragms, cervical caps and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
Statement 2: They are chemical barriers of conception and are reusable.
(a) Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
(b) Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
(c) Statement 1 is correct but statement 2 is incorrect.
(d) Both statements 1 and 2 are incorrect.
Answer Key:
(c) Statement 1 is correct but statement 2 is incorrect.
7. Match column I with column II and select the correct option from the codes given below
|
Column I
|
Column II
|
|
A. Copper
releasing IUD
|
(i)
LNG-20
|
|
B.
Hormone releasing
|
(ii)
Lippes loop IUD
|
|
C. Non
medicated IUD
|
(iii)
Saheli
|
|
D. Mini
pills
|
(iv)
Multiload-375
|
(b) A-(iv), B-(i), C-(iii), D-(ii)
(c) A-(i), B-(iv), C-(ii), D-(iii)
(d) A-(iv), B-(i), C-(ii), D-(iii)
Answer Key:
(d) A-(iv), B-(i), C-(ii), D-(iii)
8. Select the incorrect action of hormonal contraceptive pills from the following
(a) Inhibition of spermatogenesis.
(b) Inhibition of ovulation.
(c) Changes in cervical mucus impairing its ability to allow passage and transport of sperms.
(d) Alteration in uterine endometrium to make it unsuitable for implantation.
Answer Key:
(a) Inhibition of spermatogenesis.
II. Short answer questions
12th bio zoolgy III. Long answer questions
12th bio zology
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