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. Organismic respiration is also known as ?

Exhalation

Inhalation

Intake

Breathing

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

Three way

Two way

One way

Four way

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

Animals

All organisms

Plants

Microorganisms

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

Stomata

Epidermal pores

Lenticels

Cortical pores

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

Oxygen

All of these

Energy

Haemoglobin

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6. In frog respiration occurs through ?

Skin

Buccal chamber

All of these

Lungs

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

Fishes

Man

Birds

Cockroach

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8. Infact photorespiration is reverse of ?

Dark reaction

Both a and b

Calvin cycle

Photosynthesis

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9. Breathing is directly involved in the exchange of ?

Oxygen

Gases

Carbon

Oxygen and carbon

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

Glottis

Spiracles

Tracheoles

Bronchioles

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11. ATP is produced during ?

None of these

Organismic respiration

Cellular respiration

Both a and B

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

Skin

Lungs

All of above

Blood

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13. In fish the heart pumps blood directly to ?

All parts of the body

Gills

Lungs

Kidneys

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14. Photoresptration take place in ?

Night

Cloud

Rain

Day

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

Osmosis

Diffusion

Both a and b

Active transport

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

Lenticels

Epidermis

Stomata

Cuticle

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17. Hydra respires through ?

Coelenteron

None of these

Lungs

Skin

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

Operculum

Spiracles

Tentacles

Epiglottis

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19. Water is _______ times more viscous than air ?

70

50

20

80

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

Sea level

Both A % B

Cellular level

Organismic level

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21. The heart of fish is ?

Single circuit

Partly sigle % partly double circuit

Double circuit

Triple circuit

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

20%

50%

30%

40%

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23. In peroxisome the glycolate is converted in to ?

Glutamic acid

Glucose

Glycine

Glutamine

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24. Photorespiration in plants takes pace when ?

None of these

Carboxylase is active

O2 is high

Light is low

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25. Oxygen content of fresh air is about ?

80 ml per liter

120 ml per liter

10 ml per liter

200 ml per liter

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