2024 Re-NEET Transport in PlantsPhloem transport - pressure flow hypothesis Medium Question 1 of 2 in Phloem transport - pressure flow hypothesis

Which of the following helps in maintenance of the pressure gradient in sieve tubes?

A Albuminous cells
B Sieve cells
C Phloem parenchyma
D Companion cells

The answer is D.

Solution

Companion cells are closely associated with sieve tube elements and help maintain the pressure gradient required for translocation of food (loading and unloading of sugars) through the sieve tubes.

Concept Phloem transport - pressure flow hypothesis

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2 questions from this chapter have appeared across 2 exam years.