Multiple Choice QuestionsOne of the commonly used plant growth hormone in tea plantations is
ethylene
abscisic acid
Zeatin
Zeatin
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
B.
leaf abscission
Senescence can be defined as the sum of deteriorative processes, which naturally terminate the functional life of an organism. Senescence is not confined only to the whole plant, it may be limited to a particular plant organ such as leaf and flower or cells such as phloem and xylem. Abscission is the natural shedding of leaves, foliage branches, fruits, floral parts etc. According to Leopold (1967) abscission is a Senescence phenomenon. Senescence as an active development cellular process in growth and functioning of a flowering plant is indicted in leaf abscission.
Whole plant senescence also known as overall senescence occur in annulas (eg, rice, wheat, gramme, mustard) biennials (eg, henbane or perennials.)
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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