10th class Biology unit 1 MCQs
chapter 1 MCQs 10th Class Biology
Gaseous Exchange:
1. Stomata are present in:
a. Xylem
b. Epidermis
c. Phloem
d. Endodermis
2. Stomata are frequently present in:
a. Both sides of a leaf
b. Upper side of a leaf
c. A stem
d. Lower side of a leaf
3. Which gas is absorbed through stomata of plants during night?
a. Nitrogen
b. Carbon dioxide
c. Hydrogen
d. Oxygen
4. No. of Bronchi in the air passage way are:
a. One
b. Two
c. Many
d. None of these
5. Main role to give out air from lungs is:
a. Bronchiole
b. Nasal cavity
c. Diaphragm
d. Bronchus
6. Taking in of oxygen and giving out of carbon dioxide is called:
a. Gaseous exchange
b. Aerobic respiration
c. Respiration
d. Anaerobic respiration
7. Percentage of oxygen in expelled air is:
a. 79%
b. 16%
c. 30%
d. 21%
8. The amount of oxygen in the inspired air is:
a. 22%
b. 20%
c. 23%
d. 21%
9. The rate of breathing at rest in humans is:
a. 80-100 times per minute
b. 16-20 times per minute
c. 10-20 times per minute
d. 70-80 times per minute
10. The rate of breathing during exercise or other hard physical work is:
a. 30-40 times per minute
b. 10-20 times per minute
c. 40-50 times per minute
d. 20-30 times per minute
11. Percentage of carbon dioxide in expelled air is:
a. 8%
b. 4%
c. 7%
d. 5%
12. Glottis is the opening of:
a. Trachea
b. Pharynx
c. Epiglottis
d. Larynx
13. The glottis is guarded by a flap of tissue called:
a. Bronchi
b. Trachea
c. Epiglottis
d. Glottis
14. All the alveoli of one side combine to form:
a. Testes
b. Lung
c. Liver
d. Kidney
15. How many pairs of ribs are present in the chest wall of humans?
a. 14
b. 10
c. 16
d. 12
16. The thick muscular structure that is present below the lungs is called:
a. Pleural membrane
b. Diaphragm
c. Abdomen
d. Thorax
17. A thick muscular layer beneath the lungs is called:
a. Diaphragm
b. Ureter
c. Kidney
d. Bladder
18. The muscles of rubs are called:
a. Intercostals muscles
b. Smooth muscles
c. Costal muscles
d. Cardiac muscles
19. Length of a trachea is:
a. 16 cm
b. 12 cm
c. 18 cm
d. 14 cm
20. The number of lobes in right lung is:
a. Three
b. One
c. Four
d. Tow
21. The respiratory center is present in:
a. Brain
b. Muscles
c. Lungs
d. Nose
22. During expiration in humans, the temperature of oxygen in the expired air is:
a. 22 oC
b. 16 oC
c. 25 oC
d. 21 oC
23. The gaseous exchange in mammals or cow is occured:
a. Pharynx
b. Bronchi
c. Alveoli
d. Trachea
24. Larynx is a box which is made of:
a. Adipose
b. Bone
c. Muscles
d. Cartilage
25. The box which produces sound is called:
a. Alveoli
b. Trachea
c. Larynx
d. Bronchi
26. A muscular way which is common for food and air is called:
a. Larynx
b. Trachea
c. Pharynx
d. Alveoli
27. Air enters after larynx:
a. Trachea
b. Pharynx
c. Bronchi
d. Esophagus
28. The hole present on the surface of pharynx is called:
a. Glottis
b. Larynx
c. Trachea
d. Nostrils
29. Which disease is involved in the breakdown of air sacks of the lungs?
a. Asthma
b. Pneumonia
c. Emphysema
d. Bronchitis
30. The walls of the alveoli are broken down in the disease named:
a. Pneumonia
b. Bronchitis
c. Asthma
d. Emphysema
31. Which disease is caused by streptococcus Pneumoniae?
a. Pneumonia
b. Bronchitis
c. Asthma
d. Emphysema
32. How many numbers of carcinogens are present in the cigarette smoke?
a. At least 50
b. At least 30
c. At least 60
d. At least 40
34. Inflammation of bronchi or bronchioles is called:
a. Bronchitis
b. Flu
c. Cough
d. Pneumonia
35. Every year world tobacco day is celebrated on:
a. 31st May
b. 15th May
c. 1st May
d. 25th May
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