Exam-style Questions: Plant Growth

  1. Fill in the missing words...

    Water moves from the soil into the roots by ___(i)___ and then flows steadily up the ___(ii)___. As water is lost from the leaf by ___(iii)___ more water is drawn up through the ___(iv)___ to replace it. The roots have root ___(v)___ to increase their ___(vi)___ and so allows more water to be absorbed.

    (Marks available: 6)

    Answer

    Answer outline and marking scheme for question: 1

    (i) osmosis;

    (ii) xylem;

    (iii) transpiration;

    (iv) xylem;

    (v) hairs;

    (vi) surface area.

    (Total = 6 marks)

  2. There are 3 main nutrients that are good for plants - nitrates, phosphates and potassium.

    What are the deficiency symptoms of the 3 nutrients?

    (Marks available: 6)

    Answer

    Answer outline and marking scheme for question: 2

    Nitrates: Stunted growth and yellow, older leaves;

    (2 marks)

    Phosphates: Poor roots and purple, younger leaves;

    (2 marks)

    Potassium: Yellowing leaves with dead spots.

    (2 marks)

    (Total = 6 marks)