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Bulk flow system occurs as a result of difference in ________(a) Height(b) Side of leaf(c) Pressure(d) TemperatureI got this question in final exam.Origin of the question is Long Distance Transport of Water in chapter Transport in Plants of Biology – Class 11

Answer»

Right choice is (C) Pressure

To elaborate: Bulk flow system OCCURS as a result of difference in pressure. Difference in SIDES of leaf leads to change in amount of photosynthesis, where LOWER leaf carries higher amount of photosynthesis than the upper leaf. Difference in height doesn’t have any role to play as xylem VESSELS take water from lower height to upper height. Difference in temperature leads to change in transpiration rate.



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