MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
Because of which does the acidity of the mesophyll tissue cells of a leaf increase?
Think it through first, then pick an option.
- a When the level of CO2 rises very high
- b When the level of O2 falls very low
- c When too many chloroplasts are present
- d When there is a great shortage of enzymes
Answer and explanation
Correct answer: a When the level of CO2 rises very high
When CO2 rises very high, the acidity of mesophyll cells increases, the stomata close and the rate falls.
Why the other options are wrong
- b When the level of O2 falls very low: When O2 falls the rate actually rises; it is not the cause of the acidity.
- c When too many chloroplasts are present: The book does not give many chloroplasts as a cause of rising acidity.
- d When there is a great shortage of enzymes: An enzyme shortage lowers the rate, but the acidity rises because of CO2.
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