MDCAT Biology Gaseous Exchange Online Test MCQS

MDCAT Biology Gaseous Exchange Test

Prepare for MDCAT Biology with this focused MCQ test on Gaseous Exchange. This quiz includes important questions on respiratory structures, mechanisms of gas exchange, and differences in plants and animals, following the latest MDCAT 2025 syllabus.

MDCAT 2025 Gaseous Exchange Test

Gaseous Exchange MCQS Online Question with Answer

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1. Respiration os one of the most important metabolic activities of ?

Animals

Microorganisms

Plants

All organisms

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2. Infact photorespiration is reverse of ?

Both a and b

Photosynthesis

Calvin cycle

Dark reaction

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3. In frog respiration occurs through ?

Buccal chamber

Lungs

All of these

Skin

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4. Photorespiration in plants takes pace when ?

None of these

Carboxylase is active

O2 is high

Light is low

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5. Hydra respires through ?

Coelenteron

Skin

Lungs

None of these

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6. In earthworm the exchange of gasses mainly occurs through ?

Skin

Lungs

Blood

All of above

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7. Four to five pairs of gills in fish are placed in bronchial cavities and are covered by ?

Tentacles

Operculum

Spiracles

Epiglottis

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8. ATP is produced during ?

Both a and B

None of these

Cellular respiration

Organismic respiration

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9. Exchange of gases during organismic respiration is carried out only by ?

Diffusion

Active transport

Both a and b

Osmosis

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10. In cockroach the main tracheal trunk communicates with exterior by 10 pairs of paired apertures called  ?

Tracheoles

Bronchioles

Glottis

Spiracles

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11. In birds during respiration the flow of air is ?

Four way

Two way

Three way

One way

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12. At all levels of activities in living organisms an uninterrupted supply of _______is required ?

Haemoglobin

All of these

Oxygen

Energy

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13. Parabronchi are thin walled ducts present in the respiratory system of ?

Birds

Fishes

Man

Cockroach

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14. Water is _______ times more viscous than air ?

20

70

50

80

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15. Air spaces between mesophyll cells of a leaf comprise _______of total volume

40%

20%

50%

30%

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16. Photoresptration take place in ?

Cloud

Day

Night

Rain

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17. Organismic respiration is also known as ?

Exhalation

Inhalation

Breathing

Intake

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18. The main source of exchange of gases in plants is ?

Stomata

Cuticle

Lenticels

Epidermis

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19. Breathing is directly involved in the exchange of ?

Oxygen

Oxygen and carbon

Carbon

Gases

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20. The cork tissue has special pores involved in gaseous exchange called ?

Cortical pores

Lenticels

Epidermal pores

Stomata

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21. The heart of fish is ?

Double circuit

Triple circuit

Single circuit

Partly sigle % partly double circuit

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22. In fish the heart pumps blood directly to ?

Kidneys

All parts of the body

Lungs

Gills

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23. In peroxisome the glycolate is converted in to ?

Glycine

Glutamic acid

Glutamine

Glucose

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24. Oxygen content of fresh air is about ?

80 ml per liter

10 ml per liter

120 ml per liter

200 ml per liter

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25. Respiration is one of the most important metabolic activities of ?

Cellular level

Organismic level

Sea level

Both A % B

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