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Question
Which of the following cells helps in maintaining the pressure gradient in the sieve tubes?
Which of the following cells helps in maintaining the pressure gradient in the sieve tubes?
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Solution
The correct option is C Companion cell
Phloem is made up of four components - (1) sieve elements (2) companion cells (3) parenchyma (4) fibres.
Phloem fibres/bast fibres are dead and provide only mechanical support, parenchyma is used for the radial conduction of food; sieve elements are involved in the longitudinal transport of food, and the companion cell is involved in the pressure gradient for the transport of food.
Wood fibre is a part of xylem.
Phloem is made up of four components - (1) sieve elements (2) companion cells (3) parenchyma (4) fibres.
Phloem fibres/bast fibres are dead and provide only mechanical support, parenchyma is used for the radial conduction of food; sieve elements are involved in the longitudinal transport of food, and the companion cell is involved in the pressure gradient for the transport of food.
Wood fibre is a part of xylem.
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