[Biology Class Notes] on MCQs on Plant Hormones Pdf for EXAM

Plant hormones are also known as phytohormones. Plant hormones can be described as chemical substances produced in plants that may be transmitted from one region to another and regulate one or more physiological reactions while present in low concentrations. Some of the important plant hormones are – Auxin, Gibberellin, Ethylene, Abscisic acid, and Cytokinin. These hormones are involved in growth and development responses such as cell division, seed formation, flowering, seed formation and abscission.

MCQs on Plant Hormones

Let us learn some information about the planet hormones in the form of multiple choice questions here.

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

(a) Gibberellin

(b) Auxin

(c) Ethylene

(d) Cytokinin

Ans: Auxin

2. Which of the following hormones is not a growth inhibitor?

(a) Dormin

(b) Abscisic acid

(c) Ethylene

(d) IAA

Ans: IAA

3. ___________ is a gaseous plant hormone.

(a) IBA

(b) Ethylene

(c) Abscisic acid

(d) NAA

Ans: Ethylene

4. A widely used rooting hormone is

(a) 2,4, -D

(b) NAA

(c) 2,4,5 – T

(d) Cytokinin

Ans: NAA

5. 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

Ans: 2,4, -D and 2,4,5 – T

6. Transport of auxin is

(a) non-polar

(b) symplast

(c) apoplast

(d) solar 

Ans: polar

7. Formation of the nodule is induced by

(a) IAA

(b) NAA

(c) IBA

(d) Both (a) and (c)

Ans: IAA

8. __________is the precursor of Indole-3-acetic acid.

(a) Methionine

(b) Tryptophan

(c) Glycine

(d) Isopentenyl pyrophosphate

Ans: Tryptophan

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

(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 

Ans: 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 dominant 

Ans: Inducing dormancy.