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WAEC Biology 2018 Question 10

Question 10

Transport in Plants

A seedling was made to stand in a solution of red ink for three hours and a transverse section of the stem was examined under the microscope. The process being investigated was

  1. A.the importance of micro elements to plants.
  2. B.ascent of water through the xylem.
  3. C.diffusion of coloured substances.
  4. D.distribution of food in plants.
Show the answer and explanation

Answer: B (ascent of water through the xylem.)

Explanation

The dye travels with the water and stains only the xylem vessels. This shows that water rises up the stem through the xylem.