Q19 of 44 Page 79

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

A tree trunk exchanges gases with the environment although it lacks the stomata because it has lenticels through which oxygen and other gas exchange occurs. They are cells consisting of large intercellular pores.


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The energy yield in terms of ATP is higher in aerobic respiration than during anaerobic respiration. Explain.

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RuBP carboxylase, PEP carboxylase, Pyruvate dehydrogenase, ATPase, cytochrome oxidase, Hexokinase, Lactate dehydrogenase. Select/choose enzymes from the list above which are involved in

a. Photosynthesis


b. Respiration


c. Both in photosynthesis and respiration


 20

Write any two energy yielding reactions of glycolysis.

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Name the site (s) of pyruvate synthesis. Also, write the chemical reaction wherein pyruvic acid dehydrogenase acts as a catalyst.