21. State the full form of IAA
A. Indole- 3 acetic anhydrase
B. Indole-3 acetic acid
C. Indole- 3 aceto acetate
D. Indole-3 aceto-acetic
Answer : Option B
22. Which of the following physiological process performed by gibberrelic acid?
A. Dwarfism of tall plant genetically
B. Elongation of short plant genetically
C. Growth in size of stem and root formation
D. Yellowing of young leaves
Answer : Option C
23. Which of the following physiological process performed by gibberrelic acid?
A. Dwarfism of tall plant genetically
B. Elongation of short plant genetically
C. Growth in size of stem and root formation
D. Yellowing of young leaves
Answer : Option C
24. Which of the following is used to enhance colour of fruits and more juice in fruits unnaturally?
25. Which hormone is responsible for apical dominance?
26. With which reaction Phytochrome is associated ?
27. In the absence of light, amount of which of the following is increased ?
A. Absorption of mineral salts
B. Absorption of water
C. Elongation of internodes
D. Ascent of sap
Answer : Option C
28. When is abscission- layer formed?
A. With increased concentration of auxin
B. With decreased concentration of auxin
C. With increased concentration of gibberrelin
D. With decreased concentraton of gibberelin
Answer : Option B
29. Vernalization is
A. Growth graph related to light
B. Effect of photoperiod on the growth of plant, which results flowering
C. Rapid growth in low temperature
D. Daily photo period
Answer : Option C
30. What is initiative substance of IAA?