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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
What are the characteristics of alveoli?
  • ✓
    Very thin, irregular walled and highly vascularised
  • B
    Thick and smooth membrane
  • C
    Network of blood capillaries and thick-walled
  • D
    Thick, regular walled and lack of blood vessels
✓

Answer

Correct option: A.
Very thin, irregular walled and highly vascularised
a
Alveoli membrane is very thin, irregular, richly supplied with blood vessels because of which exchange of gases easily occurs here.

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