What will be the effect on photochrome in a plant subjected to continuous red light?
Level of phytochrome decreases
phytochrome is destroyed
phytochrome synthesis increases
Destruction and synthesis of phytochrome remain equiliburium
Plants deficient of element zinc, shows its effect on the biosynhesis of plant growth hormone
abscisic acid
auxin
cytokinin
ethylene
Hormone primarily connected with cell division is
IAA
NAA
cytokinin/ zeatin
gibberellic cid
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant , is indicated in
vessels and tracheid differentiation
leaf abscission
annual plants
floral parts
Gibberellins induce
flowering
production of hydrolysing enzymes in germinating seeds
cell division
hasten leaf senescence
The wavelength of light absorbed by Pr form of phytochrome is
640 nm
680 nm
720 nm
620 nm
Which one of the folowing pairs, is not correctly matched?
Abscisic acid --- Stomatal closure
Gibberellic acid ---- Leaf fall
Cytokinin --- Cell division
IAA --- Cell wall elongation
Growth of pollen tube towards embryo sac is
geotropism
thigmotaxis
chemotaxis
all of these
Klinostat is employed in the study of
osmosis
growth movements
photosynthesis
respiration
Response of different organisms to environmental rhythms of light and darkness
phototaxis
phototropism
vernalization
photoperiodism
