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Transport in plants

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Question 14

An investigator studies the feeding mechanisms of two different herbivorous insect species that target the vascular tissues of a herbaceous plant stem:

  1. Species X inserts its specialized mouthpart (stylet) into a vascular tissue and feeds passively, as the high positive hydrostatic pressure of the sap forces the fluid directly into its digestive tract.
  2. Species Y targets a different vascular tissue and must use a highly developed muscular pump in its head to actively draw fluid out of the tissue against a negative hydrostatic pressure (tension).

Which of the following correctly identifies the primary cell types targeted by Species X and Species Y, and the main solute transported by the tissue targeted by Species X?

A

Target of Species X: xylem vessels; Target of Species Y: sieve tube elements; Main solute: sucrose

B

Target of Species X: sieve tube elements; Target of Species Y: xylem vessels; Main solute: sucrose

C

Target of Species X: sieve tube elements; Target of Species Y: companion cells; Main solute: amino acids

D

Target of Species X: companion cells; Target of Species Y: xylem vessels; Main solute: glucose

Markscheme

Transport in plants Questions

  1. A Level
  2. /Biology
  3. /Transport in plants

28 exam-style questions on OCR A A Level Biology Transport in plants. Each one has a worked solution and a mark scheme showing where the marks go.

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