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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?
Glycolysis is a process ___________.
One same common function is performed by?
Name the following:
Energy currency of cell.
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 :
_________ 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 diagram refers to an apparatus which is used to demonstrate a physiological process:
What is the purpose of keeping boiled peas soaked in a disinfectant in test tube Y?
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.
What do you understand by respiration?
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.
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?
Observe the figure carefully and answer the following questions.
- In which jar, will the amount of CO2 be the highest and why?
- In which jar, will the amount of CO2 be the lowest and why?
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 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?
Mitochondria are called powerhouses of the cell. Which of the following observations support this statement?
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?
