Top 150+ Solved Growth and Development in Plants MCQ Questions Answer
Q. If apical region of stem is removed from any plant, what is observed? (CMPT - 1993, CBSE -1994, 2000, KARNATAKA - 2000
a. New apical bud formation
b. Length of main stem increases
c. Plant dies
d. Lateral branches emerges
Q. Which of the hormone is synthetic ? (MPPMT 1996, AIIMS 1996, BHU 1997, CPMT 1999)
a. GA3
b. GA2
c. IAA
d. 2-4 D
Q. What is agent Orange ? (CBSE 1998, AIMS 1999)
a. Weedicide with dioxin
b. Chemical used in luminiscent plant
c. Insectide which is biodegradable
d. Colour used in tube light
Q. 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 ? (CBSE 2004)
a. Long-day plant
b. Day-neutral plants
c. Medium-day plants
d. Short-day plants
Q. How gibberrelin accelerates seed germination ? (AIIMS 2005)
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
Q. Which hormone is synthesized by root and endosperm?
a. Auxin
b. Cytokinin
c. Gibberrelin
d. Ethylene
Q. Which hormone is responsible for growth of leaf-apex ?
a. IAA
b. Zeatin
c. Gibberrelin
d. Ethylene
Q. How can a biannual plant be converted into an annual plant?
a. By cold process of seeds
b. By giving more light
c. By giving more oxygen
d. By giving more temperature
Q. Which of the following reaction is observed in droping of drocera due to insects ?
a. Thigmonasty
b. Chemotropis
c. Photonasty
d. Thigmotropism
Q. What is responsible for opening and closing of tulip flower ?
a. Photonastic movement
b. Geotropism
c. Thermonasty
d. Nictinasty
Q. By which reaction growth of cuscuta occurs on host plant ?
a. Thigmotropism
b. Chemtropism
c. Thigmonasty
d. Photonasty