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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?
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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.
Differentiate between Respiration and Combustion.
What happens to the energy liberated during respiration?
One same common function is performed by?
Do the plants respire all day and all night or only at night?
Name the following:
Aerobic respiration requires_________ .
Why is it usually difficult to demonstrate respiration in green plants?
How is tilling of the soil useful for the crops growing in it?
Fill in the blank :
_________ are the openings found on older stems.
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?
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 two chemical reactions are supposed to indicate a certain process occurring in the green plants under two different conditions:
(a) C6H12O6 + 6O2 → 6CO2 + _______ + 38 ATP
(b) C6H12O6 → ________ + 2 CO2 + 2 ATP
(i) Fill in the blank in each reaction.
(ii) Name the process represented by the two reactions.
(iii) What are the conditions under which the two reactions (a) and (b) are occurring respectively?
The following diagram refers to an apparatus which is used to demonstrate a physiological process:
Name the biological process which causes the above rise.
The following diagram refers to an apparatus which is used to demonstrate a physiological process:
Define the biological process shown in the experiment.
Name the following:
The process of living beings which is concerned with the release of energy for use in the body.
The roots of a plant take up oxygen from the ______ trapped between the ______ particles.
Which gas present in the air is essential for aerobic 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 few hours, the dough had risen. There was a sour smell too.
Why did the dough rise?
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 few hours, the dough had risen. There was a sour smell too.
Why did the dough smell sour?
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 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 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?
Explain the term “Energy Currency”. Which substance acts as energy currency in plants and animals?
If a person is feeling dizzy, glucose or fruit juice is given immediately but not a cheese sandwich Explain.
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
How does a tree trunk exchange gases with the environment although it lacks stomata?
