Question

Class 10 biology
choose the correct option with reason.

A strip of black paper was fixed on the under or dorsal surface
of a leaf of destarched potted plant. The plant was then kept
in the sun. After four hours the leaf was tested for starch. The
result was
(A) Part of under surface covered by black strip was pale while
the rest was blue-black.
(B) The whole leaf turned blue black
(C) The whole leaf remained white
(D) Both the surfaces in the covered area remained white.
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Answer 1

Answer:

(b) the wolhe leaf turned bule blach