Question

A destarched potted plant was taken and an experimental leaf of this plant was selected. The portions A, B and C of this leaf were covered with black paper ships. This plant was exposed to sunlight for six hours and then the experimental leaf was tested for starch. It was observed that the :
(A) Covered portions A, B and C turned blue-black
(B) Exposed portions 1, 2 and 3 turned blue-black
(C) Covered portions A, B and C did not change colour
(D) Exposed portions 1, 2 and 3 did not change colour


CBSE Class X Science VSA (1 Mark)

Answer 1

(B) Exposed portion has performed photosynthesis it will turn blue-black in the starch test

Answer 2

A destarched potted plant was taken and an experimental leaf of this plant was selected. The portions A, B and C of this leaf were covered with black paper ships. This plant was exposed to sunlight for six hours and then the experimental leaf was tested for starch. It was observed that the : {will turn black in color}