Plant physiology multiple choice questions answer key

S.N.	Name of quiz	Test number
(01).	PGR MCQ: Plant Growth Regulators (Phytohormones)	01
(02).

(01). PGR MCQ: Plant Growth Regulators (Phytohormones)

1.	d	6.	c
2.	c	7.	d
3.	a	8.	a
4.	d	9.	a
5.	d	10.	b

11.	b	16.	a
12.	c	17.	a
13.	b	18.	d
14.	c	19.	c
15.	d	20.	a

21.

c

22.

d

23.

d

24.

b

25.

a

This page includes multiple choice objective questions from the main subject plant physiology. We will update this page whenever a new post is available.

1. d. 2. c. 3. a. 4. d. 5. d.
2. c. 7. d. 8. a. 9. a. 10. b.
3. b. 12. c. 13. b. 14. c. 15. d.
4. a. 17. a. 18. d. 19. c. 20. a.
5. c. 22. d. 23. d. 24. b. 25. a

Explanations:

PGR MCQ: Plant Growth Regulators (Phytohormones)

PGR: Plant Growth Regulators. It is also known as Plant Hormones. Auxin, cytokinin, gibberllin, etc., are growth hormones. ABA is a growth retardant hormone.

Avena Curvature Test: Avena Curvature Test or ACT is a bioassay. It is related to auxin. It measures the angle of curvature of a decapitated coleoptile.

2, 4-D: 2, 4-D belongs to auxin. It is used as a herbicide to kill broad-leaves weeds. It acts as plant growth regulator at low concentrations.

Apical dominance: In apical dominance, the growth of terminal portion is dominated by the plant growth regulator auxin.

Seed dormancy: Some seeds require dormancy for a certain period of time. Germination won’t take place during dormancy. Gibberllin is a strong and most used plant growth regulator to break the dormancy of seeds.

ABA: ABA or Abscisic acid is an anti plant growth regulator. It supress the growth and development of a plant. We can use it to develop a bonsai.