NEET MCQ on Plant Hormones Quiz Questions

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1. Indole-3-acetic acid is the most common naturally occurring plant hormone of _______ class

A Gibberellin B Auxin C Ethylene D Cytokinin

2. This hormone is not a growth inhibitor

A Dormin B Abscisic acid C Ethylene D IAA

3. ___________ is a gaseous plant hormone

A IBA B Ethylene C Abscisic acid D NAA

4. A widely used rooting hormone is

A 2,4, -D B NAA C 2,4,5 – T D Cytokinin

5. The leaf defoliator utilized in the Vietnam war by the USA known as “Agent Orange” was

A 2,4, -D and 2,4,5 – T B Ethylene C 2,4, -D and NAA D 2,4,5 – T, ethylene and NAA

6. Transport of auxin is

A non-polar B symplast C apoplast D polar

7. Formation of the nodule is induced by

A IAA B NAA C IBA D Both and

8. This is the precursor of Indole-3-acetic acid

A Methionine B Tryptophan C Glycine D Isopentynyl pyrophosphate

9. This bioassay is used to detect the presence of auxin

A Only tobacco pith culture B Tobacco pith culture and Avena curvature test C Tobacco pith culture and Split pea stem curvature test D Split pea stem curvature test and Avena curvature test

10. Which of these is not a function of auxin?

A inducing callus formation B inducing dormancy C enhancing cell division D maintaining apical dominance

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