Question

2.(c)(i) What is a variegated leaf?
(ii) Which part of the variegated leaf would test positive when treated with iodine solution?
(iii) State two reasons for the answer in 2(c)(i).
(iv) Name one mineral element required by plants for the formation of the part that would test positive in 2(c)(i).

Accepted Answer

(i) A variegated leaf is a leaf with different coloured patches (green and non-green areas).
(ii) Only the green part of the leaf will test positive for starch.
(iii) The green parts contain chlorophyll, which they use to manufacture carbohydrates (starch); the non-green parts lack chlorophyll and so cannot photosynthesise or produce starch.
(iv) Magnesium (iron and nitrogen are also needed for chlorophyll formation).

WAEC Biology 2018 Theory — Question 7

Sign up free to unlock