One of the synthetic auxin is:
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Solution
NAA is a synthetic auxins. Some of the most widely used weed killers are synthetic auxins. Synthetic auxin analogs include 1–naphthaleneacetic acid (NAA),2, 4-dichlorophenoxy acetic acid (2,4-D) and2,4,5-trichlorophenoxy acetic acid (2,4,5- T).
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
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Solution
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in leaf abscission. Senescence is the changes that occur in an organism between maturity and death,i.e., ageing.Characteristically there is a deterioration in functioning as the cells become less efficient in maintaining and replacing vital cells components.
“Foolish seedling’’ disease of rice led to the discovery of
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Solution
The effect of gibberellins had been known in Japan since early 1800 where certain rice plants were found to suffer from bakane or bakanae (foolish seedling) disease. Such rice plants were thin, pale green, spindle-shaped, longer by 50% than the healthy plants, and were sterile.
The pine apple which under normal conditions is difficult to blossom has been made to produce fruits throughout the year by the application of
Opening of floral buds into flowers, is a type of
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Solution
Opening of floral buds into flowers,is a type of autonomic movement of water which is due to epinasty.
How does prunning help in making the hedge dense?
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Solution
When an apical bud is present on a plant, it suppresses the growth of axillary buds, this is called apical dominance. When in prunning apical bud is cut off the axillary buds start growing and hedge become dense.
Identify two of the following phytohormones which regulate the stomatal movements.
(1)IAA
(2)GA3
(3)Zeatin
(4)ABA
The correct pair is
An enzyme that can stimulate germination of barley seeds is
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Solution
a-amylase enzyme stimulates the germination of barley seed.
Cell elongation in internodal regions of the green plants takes place due to
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Solution
Gibberellins induces elongation of internodes.
One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?
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Solution
Short day plants require long uninterrupted dark period for flowering. They will not produce flower if night was interrupted by flash of light.