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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
Differentiate between Respiration and Combustion.
One same common function is performed by?
Name the following:
An organism which respires throughout life anaerobically.
Name the following:
Aerobic respiration requires_________ .
Why is it usually difficult to demonstrate respiration in green plants?
Fill in the blank :
Glycolysis occurs in the _______of the cells.
Fill in the blank:
_____________ is a respiratory substrate
How do the following structures help in respiration in plants?
Root hairs ____________
Complete the following statement by choosing the correct alternative out of those given below.
Every living cell of the plant
Name the following:
The process of living beings which is concerned with the release of energy for use in the body.
Which gas present in the air is essential for aerobic respiration? What is the role of oxygen during respiration?
A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After a few hours, the dough had risen. There was a sour smell too.
Why was sugar added to the dough?
A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After a few hours, the dough had risen. There was a sour smell too.
What would have happened if the dough was kept in the refrigerator, soon after it was prepared?
Mitochondria are called powerhouses of the cell. Which of the following observations support this statement?
When a substrate is being metabolized, why does not all the energy that released in one step. It is released in multiple steps.What is the advantage of step-wise release?
RuBP carboxylase, PEP carboxylase, Pyruvate dehydrogenase, ATPase, cytochrome oxidase, Hexokinase, Lactate dehydrogenase.
Select/choose enzymes from the list above which are involved in
- Photosynthesis
- Respiration
- Both in photosynthesis and respiration
