Sexual Reproduction in Flowering Plants Question 94

94. The viability of seeds is tested by

(a) Safranine

(b) 2,6 dichlorophenol indophenols

(c) 2,3, 5 triphenyl tetrazolium chloride

(d) DMSO

Show Answer

Answer : c

Hints & Solutions

(c) Dehydrogenase enzymes present in living tissue reduce the tetrazolium chloride to formazan, a reddish, water insoluble compound. This reaction occurs in or near living cells which are releasing hydrogen in respiration processes. Viable tissues produce a normal red-colour, weak living tissue produce an abnormal colour. Dead tissues do not stain, remaining usually white.