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प्रश्न
Respiration requires O2. How did the first cells on the earth manage to survive in an atmosphere that lacked O2?
उत्तर
During the process of respiration, oxygen is utilised, and carbon dioxide, water and energy are released as products. The combustion reaction requires oxygen. But some cells live where oxygen may or may not be available. There are sufficient reasons to believe that the first cells on this planet lived in an atmosphere that lacked oxygen. Even among present-day living organisms, we know of several that are adapted to anaerobic conditions.
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संबंधित प्रश्न
What are respiratory substrates?
Name the most common respiratory substrate.
What happens to the energy liberated during respiration?
Name the following:
Energy currency of cell.
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Fill in the blank:
_____________ is a chemical which absorbs oxygen of the air.
How do the following structures help in respiration in plants?
Lenticels _____________
How do the following structures help in respiration in plants?
Stomata _____________
How do the following structures help in respiration in plants?
Root hairs ____________
The following diagram refers to an apparatus which is used to demonstrate a physiological process:
Name the biological process which causes the above rise.
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- In which jar, will the amount of CO2 be the lowest and why?
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Why did the dough rise?
Explain the term “Energy Currency”. Which substance acts as energy currency in plants and animals?
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It is known that red muscle fibres in animals can work for longer periods of time continuously. How is this possible?
