11th class (FSc) Biology Unit 13 MCQs
Chapter 13 MCQS 11th Class Biology
Gaseous Exchange:
1. The exchange of gases (CO2and O2) between the organism and its environment is called:
a. Cellular respiration
b. Respiration
c. Anaerobic respiration
d. External respiration
2. How many molecules of oxygen can bind with a molecule of myoglobin:
a. 02
b. 04
c. 01
d. 03
3. Oxygen diffuses many times more quickly in air than in water
a. 6500 times
b. 4000 times
c. 8000 times
d. 7000 times
4. How many molecules of oxygen can bind with a molecule of myoglobin?
a. 2
b. 4
c. 1
d. 3
5. Oxygen content of fresh air is about ……… ml per liter as compared with water media:
a. 400
b. 100
c. 800
d. 200
6. Oxygen content of fresh air are:
a. 10 ml / litre
b. 200 ml / litre
c. 150 ml / litre
d. 100 ml / litre
7. Water is more viscous than air:
a. 50 times
b. 10 times
c. 100 times
d. 20 times
8. A liter of H2O contains ml of oxygen:
a. 30
b. 10
c. 40
d. 20
9. Air spaces between mesophyll cells of a leaf comprise ……… of the total volume.
a. 40%
b. 20%
c. 50%
d. 30%
10. During photorespiration, glycine is converted into serine in the:
a. Golgi bodies
b. Mitochondria
c. Chloroplast
d. Ribosome
11. During photorespiration, glycolate diffuses into the membrane bounded organelle named as:
a. Peroxisome
b. Mitochondria
c. Golgi bodies
d. Ribosome
12. The pathway in which RUBP is converted into serine is called:
a. Photorespiration
b. Breathing
c. Electron transport chain
d. Photophosphory latio
13. A process in which riboluse biphosphate carboxylase /oxygenase (Rubisco) fixes oxygen instead of carbon dioxide is called:
a. Glycolysis
b. Respiration
c. Kreb’s cycle
d. Photorespiration
14. Respiratory activity which occurs in plants during day time is called:
a. Photorespiration
b. Respiration
c. Cutaneous respiration
d. Transpiration
15. During photorespiration glycine after its formation diffuse into:
a. Peroxisome
b. Ribosome
c. Glyoxisome
d. Mitochondria
16. Rubisco is the most abundant protein in:
a. Chloroplast
b. Golgi bodies
c. Nucleoli
d. Mitochondria
17. The most abundant protein in chloroplast and probably most abundant protein in the world is:
a. Insulin
b. Haemoglobin
c. Globulin
d. Rubisco
18. The main site of exchange of gases in plants are:
a. Cuticle
b. Stomata
c. Epidermis
d. Lenticel
19. Rubisco fixes oxygen instead of CO2:
a. Kreb’s cycle
b. Photosynthesis
c. Respiration
d. Photorespiration
20. The respiratory system is most efficient in ………:
a. Fish
b. Man
c. Snake
d. Bird
21. The respiratory organs in fish are:
a. Gills
b. Lungs
c. Trancheae
d. Air scas
22. In earthworms exchange of gases mainly occurs through:
a. Skin
b. Gills
c. Ostia
d. Lung
23. The number of air sacs in birds are:
a. 8
b. 6
c. 9
d. 7
24. Lungs of birds have thick walled ducts called:
a. Bronchi
b. Alveoli
c. Parabrounchi
d. Trachea
25. The most efficient and highly modified for gaseous exchange in aquatic animals are:
a. Spiracles
b. Gills
c. Trachea
d. Lungs