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Respiration requires O(2). How did the f...

Respiration requires `O_(2)`. How did the first cells on the earth magage to survive in an atmosphare that lacked `O_(2)`?

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### Step-by-Step Solution: 1. **Understanding Respiration**: - Respiration is a biochemical process that cells use to convert nutrients into energy. It can occur in two main forms: aerobic respiration (which requires oxygen) and anaerobic respiration (which does not require oxygen). 2. **First Cells on Earth**: - The first cells that appeared on Earth were likely simple, primitive organisms, such as bacteria. These organisms existed in an environment that lacked free oxygen. ...
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Plants do not require O_(2) for respiration and they never give out CO_(2) .

First O_(2) , was released into the atmosphere by

How is O_(2) transported in the body?

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In H_(2)-O_(2) fuel cell, the reaction occurring at cathode is

In H_(2)-O_(2) fuel cell, the reaction occurring at cathode is

Respiration releases energy in the form of ATP Respiration in the presence of O_(2) is called Aerobic respiration.

The formation of the oxide ion O_(g)^(2-) requires first an exothermic and then an endothermic step as shown below: O_(g)+e^(-) rarr O_(g)^(-) , DeltaH=-142 kJ mol^(-1) O(g)+e rarr O_(g)^(2-) , DeltaH=844kJ mol^(-1) This is because:

The following data were obtained during the first order thermal decomposition of N_(2)O_(5) (g) at constant volume : 2N_(2) O_(5)(g)to 2N_(2)O_(4)(g) +O_(2)(g) Calculate the rate constnat.

Given below is a list of different steps (i-vi) involved in respiration. (i) Utilisation of O_(2) by the cells for cataolic reactions. (ii) Transport of gases by the blood. (iii) Pulmonary ventilation by which atmospheric air is drawn in and CO_(2) is released out. (iv) Release of resultant CO_(2) . (v) Diffusion of O_(2) and CO_(2) between blood and tissues. (vi) Diffusion of gases ( O_(2) and CO_(2) ) across alveolar tissues. Select an option which has correct sequence of all the steps.

NCERT EXEMPLAR ENGLISH-RESPIRATION IN PLANTS -SHORT ANSWER TYPE QUESTIONS
  1. The energy yield in terms of ATP is higher in aerobic respiration than...

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  2. Oxygen is an essential requirement for aerobic respiration but it ente...

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  3. Respiration is an energy releasing adn enzymatically controlled catabo...

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  4. Comment of the statement resiration is an energy producing process but...

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  5. The figure given below shows the steps in glycolysis. Fill in the miss...

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  6. Respiratory pathway is

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  7. We commonly call ATP as the energy currency of the cell. Can you think...

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  8. ATP produced during glycolysis is a result of substrate level phosphor...

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  9. Do you know any step in the TCA cycle where there is substrate level ...

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  10. In a way green plants and cyanobacteria have synthesised all the food ...

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  11. When a substrate is being metabolised, why does not all the energy tha...

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  12. Respiration requires O(2). How did the first cells on the earth magage...

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  13. It is known that red muscle fibres in animals can work for longer peri...

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  14. The energy yield of ATP is higher in aerobic respiration than during a...

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  15. RuBP carboxylase, PEPcase, pyruvate dehydrogenase, ATPase, cytochrome ...

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  16. How does a tree trunk exchange gases with the environment although it...

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  17. Write two energy yielding reactions of glycolysis.

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  18. Name the site (s) of pyruvate synthesis. Also write the chemical react...

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  19. Resipratory pathway is believed to be a catabolic pathway. However, na...

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  20. Mention the important series of events of aerobic respiration that occ...

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