Plant hormones are also known as the Phytohormones. These hormones are the only molecules synthesized within plants that take place in extremely low concentrations. Some of the important plant hormones are – Auxin, Gibberellin, Ethylene, Abscisic acid and Cytokinin.
Q1. Indole-3-acetic acid is the most known and naturally occurring plant hormone of _______ class
(a) Gibberellin
(b) Auxin
(c) Ethylene
(d) Cytokinin
Answer: Auxin
Q2. This hormone is not a growth inhibitor
(a) Dormin
(b) Abscisic acid
(c) Ethylene
(d) IAA
Answer: IAA
Q3. ___________ is a gaseous plant hormone
(a) IBA
(b) Ethylene
(c) Abscisic acid
(d) NAA
Answer: Ethylene
Q4. A widely used rooting hormone is
(a) 2,4, -D
(b) NAA
(c) 2,4,5 – T
(d) Cytokinin
Answer: NAA
Q5. The leaf defoliator utilized 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
Answer: 2,4, -D and 2,4,5 – T
Q6. Transport of auxin is
(a) non-polar
(b) symplast
(c) apoplast
(d) polar
Answer: polar
Q7. Formation of the nodule is induced by
(a) IAA
(b) NAA
(c) IBA
(d) Both (a) and (c)
Answer: IAA
Q8. This is the precursor of Indole-3-acetic acid
(a) Methionine
(b) Tryptophan
(c) Glycine
(d) Isopentynyl pyrophosphate
Answer: Tryptophan
Q9. This bioassay is used to detect the presence of auxin
(a) Only tobacco pith culture
(b) Tobacco pith culture and Avena curvature test
(c) A curvature test related to Tobacco pith culture and Split pea stem
(d) Tests related to Split pea stem curvature and Avena curvature
Answer: Split pea stem curvature test and Avena curvature test
Q10. Which of these in not a function of auxin
(a) inducing callus formation
(b) inducing dormancy
(c) enhancing cell division
(d) maintaining apical dominance
Answer: inducing dormancy
