Multiple Choice QuestionsOne of the commonly used plant growth hormone in tea plantations is
ethylene
abscisic acid
Zeatin
Zeatin
Root development is promoted by
abscisic acid
auxin
gibberellin
gibberellin
B.
auxin
The higher concentration of auxin causes inhibition of root elongation, but the number of lateral branches in the root is considerably increased. In plant tissue cultures, relatively amounts of auxin and cytokinin induce the development of root, shoot or undifferentiated mass of tissues. High auxin to cytokinin ratio favours the root development high cytokinin to auxin ratio favours shoot development, while intermediate concentration results in the formation of undifferentiated cell mass.
Stroma in the chloroplasts of higher plants contains
light -independent reaction enzymes
Light -dependent reaction enzymes
ribosomes
ribosomes
In which one of the following, the male and female gametophytes don't have free -living independent existence ?
Pteris
Funaria
Polytrichum
Polytrichum
Senescence as an active development cellular process in the growth and functioning of a flowering plant is indicated in
vessel and tracheid differentiation
leaf abscission
annual plants
annual plants
The length of different internodes in a culm of sugarcane is variable because of
shoot apical meristem
position of axillary buds
size of leaf lamina at the node below each internode
size of leaf lamina at the node below each internode
In leaves of C4 -plants malic acid synthesis during CO2 -fixation occurs in
epidermal cells
mesophyll cells
bundle sheath
bundle sheath
In germinating seeds fatty acids are degraded exclusively in the
proplastid
glyoxisomes
peroxisomes
peroxisomes
The wavelength of light absorbed by Pr form of phytochrome is
640 nm
680 nm
720 nm
720 nm
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