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WAEC Biology 2003 Question 5

Question 5

Transport in Plants

When a plant shoot is placed in a dye solution, under which of the following physical conditions will the dye move up the stem?

  1. A.Low temperature and low humidity
  2. B.Low temperature and high humidity
  3. C.High temperature and low humidity
  4. D.High temperature and high humidity.
Show the answer and explanation

Answer: C (High temperature and low humidity)

Explanation

Transpiration is fastest when it is hot and the air is dry. The strong transpiration pull draws the dye solution up the xylem quickly.