Download App

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
Assertion: In mammals, complex respiratory system has developed.
Reason: Mammalian skin is impermeable to gases
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • ✓
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: B.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
b
Mammalian skin is impermeable so that water loss through it is minimised. But mammals need far more oxygen to maintain their high metabolic rates than lower animals; so they need a more extensive respiratory surface. Thus, a complex mammalian respiratory system consists of the nasal cavity, nasopharynx, larynx, trachea, bronchi, bronchiole and lungs

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from STD 11 - 14. Breathing and exchange in gases→STD 11 - 14. Breathing and exchange in gases — all question types→BIOLOGY STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Blackman’s law of limiting factor is applied to
→
Choanocytes in Ascon-type of canal system form lining of
→
Which of the following structures carries out a similar function in both plant and animal cell
→
In liverworts asexual reproduction takes place by
→
Which one of the following describes the spikelet of a cereal or grass plant.
→
Ectocarpus and dictyota are example of
→
The number of floating ribs, in the human body, is:
→
Volume of air breathed in and out during normal breathing is called
→
Which of the following structures are situated in the cortical region of the kidney?

$I.$ Malpighian corpuscle

$II.$ $PCT $(Proximal Convoluted Tubules)

$III.$ $DCT$ (Distal Convoluted Tubules)

$IV.$ Loop of Henle

$V.$ Collecting duct

→
If the anthers are fused together forming a tubular structure while the filaments remain free, the condition is found in which one of the following family?
→