Which of the following helps in maintenance of the pressure gradient in sieve tubes?
Albuminous cells
Sieve cells
Phloem parenchyma
Companion cells
Companion cells are specialised parenchymatous cells, which are closely associated with sieve tube elements. The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls. The companion cells help in maintaining the pressure gradient in the sieve tubes.
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