A) Hydroponics
B) Potometer
C) Lettuce hypocotyl elongation
D) Cress root inhibition test
Correct Answer: D
Solution :
Testing of biological activity (growth) of a substance (auxin) by employing living material is called bioassay. Auxin bioassay is also a quantitative test as it measures the amount of effect in response to a particular concentration of auxin. [a] Avena coleoptile curvature test: Avena curvature test carried out by E W. Went (1928), demonstrated the effect of auxins on plant growth by performing some experiments with the oat (Avena sativa) coleoptile. [b] Split pea stem curvature test [c] Root growth inhibition test (Cress root inhibition test) Hence, the correct option is [d].
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