31. What is apical dominance?
A. Growth of apical bud is inhibited due to nearby lateral buds
B. Growth of apical bud is promoted due to removal of nearest lateral buds
C. Removal of apical bud hinders growth of lateral buds
D. Development of lateral buds hinders due to presence of apical bud
Answer : Option D
32. Which of the following is water stress hormone?
A. Benzyl amino purine
B. 2,4- dichlorophenoxy acetic acid
C. Ethylene
D. Abscisic acid
Answer : Option D
33. If apical region of stem is removed from any plant, what is observed?
A. New apical bud formation
B. Length of main stem increases
C. Plant dies
D. Lateral branches emerges
Answer : Option D
34. Which of the hormone is synthetic ?
35. What is 2-4 D ?
36. What is agent Orange ?
A. Weedicide with dioxin
B. Chemical used in luminiscent plant
C. Insectide which is biodegradable
D. Colour used in tube light
Answer : Option A
One plant group kept for 12 hrs in day and 12 hrs in night and flowering is observed in it.Another plant group is kept similarly for day - night period and for very short time light is given during dark period it do not flower. What is such type of plant called ?
A. Long-day plants
B. Day-neutral plants
C. Medium-day plants
D. Short-day plants
Answer : Option D
38. How gibberrelin accelerates seed germination ?
A. By effecting rate of cell division
B. By the synthesis of digestive juice
C. Abscisic acid
D. Absorption of water from hard seed coat
Answer : Option B
39. What is the colour of Phytochrome pigment ?
40. What is the reason of senescence leaf ?