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How does a tree trunk exchange gases wi...

How does a tree trunk exchange gases with the environment although it lacks stomata ?

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The branches of old plants are protected by cambium whose lower epidermis is broken airy Lenticels are produced in it. They do exchange of gases and transpiration through it.
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In nature the failure of structural members usually result from large torque because of twisting or bending rather than due to tensile or compressive strains. This process of structural breakdown is called buckling and in cases of tall cylindrical structures like trees, the torque is caused by its own weight bending the structure. Thus, the vertical through the centre of gravity does not fall within the base. The elastic torque caused because of this bending about the central axis of the tree is given by (Ypi r ^(2))/(4R) Y is the Young's modulus, r is the radius 4R of the trunk and R is the radius of curvature of the bent surface along the height of the tree containing the centre of gravity (the neutral surface). Estimate the critical height of a tree for a given radius of the trunk.

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KUMAR PRAKASHAN-RESPIRATION IN PLANTS-Section - E (Solution of NCERT Examplar) (Short Answer Type Qeustion)
  1. The energy yield in terms of ATP is higher in aerobic respiration tha...

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

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

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  4. Comment on the statement respiration is an energy producing process...

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

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  6. Discuss "The respiratory pathway is an amphibolic pathway "

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

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

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  9. Do your know any step in the TCA cycle where there is substrate leve...

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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 metabolized, why does not all the energy t...

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

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

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  14. The energy yield in terms of ATP is higher in aerobic respiration tha...

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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 ...

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  17. Write two energy yielding reactions glycolysis

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

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  19. Respiratory pathway is believed to be a catabolic pathway. However, ...

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

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