11th Zoology - Book Back Answers - Unit 6 - English Medium Guides

 

 

Plus One / 11th Zoology - Book Back Answers - Unit 6 - English Medium

Tamil Nadu Board 11th Standard Zoology - Unit 6: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 6 – Zoology from the Tamil Nadu State Board 11th Standard 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 Zoology  Unit 6 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 11 students! Prepare well and aim for top scores. Thank you!

Unit 6 : Respiration

I. Multiple Choice Questions

1. Breathing is controlled by
a. cerebrum
b. medulla oblongata
c. cerebellum
d. pons
Answer Key:
b. medulla oblongata

2. Intercostal muscles are found between the
a. vertebral column
b. sternum
c. ribs
d. glottis
Answer Key:
c. ribs

3. The respiratory structures of insects are
a. tracheal tubes
b. gills
c. green glands
d. lungs
Answer Key:
a. tracheal tubes

4. Asthma is caused due to
a. inflammation of bronchus and bronchioles
b. inflammation of bronchione
c. damage of diaphragm.
d. infection of lungs
Answer Key:
a. inflammation of bronchus and bronchioles.

5. The Oxygen Dissociation Curve is
a. sigmoid
b. straight line
c. curved
d. rectangular hyperbola
Answer Key:
a. sigmoid

6. The Tidal Volume of a normal person is
a. 800 mL
b. 1200 mL
c. 500 mL
d. 1100-1200 mL
Answer Key:
c. 500 mL

7. During inspiration, the diaphragm
a. expands
b. unchanged
c. relaxes to become domed-shaped.
d. contracts and flattens
Answer Key:
d. contracts and flattens

8. CO₂ is transported through blood to lungs as
a. carbonic acid
b. oxyhaemoglobin
c. carbamino haemoglobin
d. carboxy haemoglobin
Answer Key:
c. carbamino haemoglobin

9. When 1500 mL air is in the lungs, it is called
a. vital capacity
b. tidal volume
c. residual volume
d. inspiratory reserve volume
Answer Key:
a. vital capacity

10. Vital capacity is
a. TV + IRV
b. TV + ERV
c. RV + ERV
d. TV+ IRV + ERV
Answer Key:
d. TV+ IRV + ERV

11. After a long deep breath, we do not respire for some seconds due to
a. more CO₂ in the blood
b. more O₂in the blood
c. less CO₂ in the blood
d. less O, in the blood
Answer Key:
b. more O₂in the blood

12. Which of the following substances in tobacco smoke damage the gas exchange system?
a. carbon monoxide and carcinogens
b. carbon monoxide and nicotine
c. carcinogens and tar
d. nicotine and tar
Answer Key:
c. carcinogens and tar

13. Column I represents diseases and column II represents their symptoms. Choose the correctly paired option
Column I                       Column II
(P) Asthma                    (i) Recurring of bronchitis
(Q) Emphysema            (ii) Accumulation of W.B.C in alveolus
(R) Pneumonia              (iii) Allergy
a. P =iii , Q = ii, R = i
b. P =iii , Q = i,  R = ii
c. P = ii , Q = iii,R = i
d. P = ii , Q = i,  R = iii
Answer Key:
a. P =iii , Q = ii R = i

14. Which of the following best describes the process of gas exchange in the lungs?
a. Air moves in and out of the alveoli during breathing.
b. Carbon dioxide diffuses from deoxygenated blood in capillaries into the alveolar air.
c. Oxygen and carbon dioxide diffuse down their concentration gradients between blood and alveolar air.
d. Oxygen diffuses from alveolar air into deoxygenated blood.
Answer Key:
c. Oxygen and carbon dioxide diffuse down their concentration gradients between blood and alveolar air.
 
15. Make the correct pairs.
Columan-I            Column-II
(P) IC            i. maximum volume of air breathed in after forced inspiration.
(Q) EC          ii. Volume of air present after expiration in lungs.
(R) VC         iii. Volume of air inhaled after expiration.
(S) FRC        iv. Volume of air present after inspiration in lungs.
(a) P - i Q-ii, R-iii, S-iv
(b) P - ii , Q-iii, R-iv, S- i
(c) P - ii , Q-iii, R - i S-iv
(d) P-iii, Q-iv, R - i , S-ii
Answer Key:
(d) P-iii, Q-iv, R - i , S-ii

16. Make the correct pairs.
Column-I                                                   Column-II
(P) Tidal volume                                       i. 1000 to 1100 ml
(Q) Residual volume                                ii. 500 ml
(R) Expiratory reserve    volume            iii. 2500 to 3000 ml
(S) Inspiratory reserve volume               iv. 1100 to 1200 ml
(a) P-ii, Q-iv, R-i, S-iii
(b) P-iii, Q-ii, R-iv, S-i
(c) P-ii, Q-iv, R-iii, S-i
(d) P-iii, Q-iv, R-i, S-ii
Answer Key:
(a) P-ii, Q-iv, R-i, S-iii

 

II. Short answer questions

a

III. Long answer questions

a

IV. Exercise

a