Tamil Nadu Board 12th Standard Bio-Zoology - Chapter 7: Book Back Answers and Solutions
This post covers the book back answers and solutions for Chapter 7 – 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 7 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 7: Human Health and Diseases
I. Multiple Choice Questions
a) Streptococcus pyogens
b) Clostridium difficile
c) Shigella dysenteriae
d) Salmonella enteritidis
Answer Key:
c) Shigella dysenteriae
2. Exo-erythrocytic schizogony of Plasmodium takes place in ____________
a) RBC
b) Leucocytes
c) Stomach
d) Liver
Answer Key:
d) Liver
3. The sporozoites of Plasmodium vivax are formed from ___________
a) Gametocytes
b) Sporoblasts
c) Oocysts
d) Spores
Answer Key:
c) Oocysts
4. Amphetamines are stimulants of the CNS, whereas barbiturates are___________
a) CNS stimulant
b) both a and b
c) hallucinogenic
d) CNS depressants
Answer Key:
d) CNS depressants
5. Choose the correctly match pair.
a) Amphetamines - Stimulant
b) LSD - Narcotic
c) Heroin - Psychotropic
d) Benzodiazepine - Pain killer
Answer Key:
a) Amphetamines - Stimulant
6. The Athlete’s foot disease in human is caused by_________
a) Bacteria
b) Fungi
c) Virus
d) Protozoan
Answer Key:
b) Fungi
7. Cirrhosis of liver is caused by chronic intake of _________
a) Opium
b) Alcohol
c) Tobacco
d) Cocaine
Answer Key:
b) Alcohol
8. The sporozoite of the malarial parasite is present in__________
a) saliva of infected female Anopheles mosquito.
b) RBC of human suffering from malaria.
c) Spleen of infected humans.
d) Gut of female Anopheles mosquito.
Answer Key:
a) saliva of infected female Anopheles mosquito.
9. Match the pathogens with respective diseases caused by them and select the correct match using the codes given below.
A. Leishmania donavani - i. Amoebiasis
B. Wuchereria bancrofti - ii. Kala – azar
C. Trypanosoma gambiense - iii. Sleeping sickness
D. Entamoeba histolytica - iv. Filariasis
a) A-ii, B-iv, C-iii, D-i
b) A-ii, B-iv, C-i, D-iii
c) A-iii, B-i, C-ii, D-iv
d) A-i, B-iv, C-iii, D-ii
Answer Key:
a) A-ii, B-iv, C-iii, D-i
10. Paratope is an
a) Antibody binding site on variable regions
b) Antibody binding site on heavy regions
c) Antigen binding site on variable regions
d) Antigen binding site on heavy regions
Answer Key:
c) Antigen binding site on variable regions
11. Allergy involves
a) IgE
b) IgG
c) lgA
d) IgM
Answer Key:
a) IgE
12. Spread of cancerous cells to distant sites is termed as
a) Metastasis
b) Oncogenes
c) Proto-oncogenes
d)Malignant neoplasm
Answer Key:
a) Metastasis
13. AIDS virus has
a) Single stranded RNA
b) Double stranded RNA
c) Single stranded DNA
d) Double stranded DNA
Answer Key:
a) Single stranded RNA
14. B cells that produce and release large amounts of antibody are called
a) Memory cells
b) Basophils
c) Plasma cells
d) killer cells
Answer Key:
c) Plasma cells
II. Short answer questions
12th bio zoolgy III. Long answer questions
12th bio zology
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