Breathing and Exchange of Gases — Flashcards
ICSE · Class 11 · Biology
40 flashcards for Breathing and Exchange of Gases (ICSE Class 11 Biology) to test yourself on key terms and facts.
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What is respiration in living organisms?
Answer
Respiration is the process by which foodstuffs are oxidised in cells to release bond energy for use in the body. It is a catabolic process involving stepwise degradation of organic food materials, and…
What are respiratory organs?
Answer
Respiratory organs are the organs concerned with gaseous exchange, that is, intake of oxygen and output of carbon dioxide. In different animals, these may be general body surface, tracheae, gills, or …
How does Amoeba exchange gases?
Answer
Amoeba exchanges gases through its general body surface, the plasmalemma. Oxygen diffuses into the cytoplasm and carbon dioxide diffuses out into the surrounding water. No special respiratory organ is…
Why is parapodia important in Nereis?
Answer
Parapodia are thin, unjointed, leg-like flattened outgrowths in Nereis. They help in locomotion and also in gaseous exchange because they contain extensive capillary networks close to the surface.
What is cutaneous respiration? Give examples.
Answer
Cutaneous respiration is gaseous exchange through the skin over the entire body surface. Earthworms and leeches respire in this way. Frogs and toads also use moist skin for gas exchange, especially du…
Why do insects need tracheal respiration?
Answer
Insects use tracheal respiration because their skin is impermeable to gases, which helps reduce water loss. Their respiratory system consists of branched tracheae that open through spiracles and end i…
What are gills and where are they found?
Answer
Gills are specialized respiratory organs of aquatic animals such as prawns, fish, and tadpoles. They are made of gill plates with gill lamellae and are richly supplied with blood capillaries for effic…
Why are lungs efficient respiratory organs in humans?
Answer
Lungs are efficient because they contain 300 to 400 million alveoli in an adult lung, giving about 140 square metres of alveolar surface area. The capillary surface area is about 125 square metres, al…
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