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

Spiracles

Glottis

Tracheoles

Bronchioles

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2. In fish the heart pumps blood directly to ?

Lungs

Gills

Kidneys

All parts of the body

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

Cortical pores

Stomata

Lenticels

Epidermal pores

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

Three way

One way

Four way

Two way

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5. In frog respiration occurs through ?

Skin

All of these

Buccal chamber

Lungs

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6. Oxygen content of fresh air is about ?

120 ml per liter

80 ml per liter

200 ml per liter

10 ml per liter

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

40%

50%

20%

30%

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

Haemoglobin

Energy

Oxygen

All of these

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9. The heart of fish is ?

Partly sigle % partly double circuit

Double circuit

Triple circuit

Single circuit

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10. Water is _______ times more viscous than air ?

80

70

50

20

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

Man

Fishes

Birds

Cockroach

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12. Photorespiration in plants takes pace when ?

None of these

O2 is high

Carboxylase is active

Light is low

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

Tentacles

Spiracles

Operculum

Epiglottis

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14. Organismic respiration is also known as ?

Intake

Breathing

Exhalation

Inhalation

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15. Infact photorespiration is reverse of ?

Dark reaction

Both a and b

Photosynthesis

Calvin cycle

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16. Breathing is directly involved in the exchange of ?

Oxygen

Oxygen and carbon

Gases

Carbon

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

Both A % B

Organismic level

Cellular level

Sea level

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18. ATP is produced during ?

None of these

Organismic respiration

Both a and B

Cellular respiration

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19. In peroxisome the glycolate is converted in to ?

Glutamic acid

Glutamine

Glycine

Glucose

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20. Hydra respires through ?

None of these

Lungs

Skin

Coelenteron

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

Stomata

Lenticels

Epidermis

Cuticle

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22. Photoresptration take place in ?

Cloud

Night

Day

Rain

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

Diffusion

Active transport

Both a and b

Osmosis

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

All of above

Skin

Lungs

Blood

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

Microorganisms

Plants

Animals

All organisms

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