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प्रश्न
A gardener finds some broad-leaved dicot weeds growing in his lawns. What can be done to get rid of the weeds efficiently?
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उत्तर
The dicotyledonous plants grow by their apical shoot meristems while grasses (which make lawns) possess intercalary meristem. Certain auxins, such as synthetic 2, 4-Dichlorophenoxyacetic acid (2,4-D) when applied in excess can damage the shoot apical meristems but they do not cause any damage to the- intercalary meristems. Thus, when 2, 4-D is sprayed on lawns, only the dicots get killed and the lawns become free of weeds.
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संबंधित प्रश्न
Ethylene is used for ______.
The affect of apical dominance can be overcome by which of the following hormone ______.
Match the following:
| Column A | Column B |
| A. IAA | i. Herring sperm DNA |
| B. ABA | ii. Bolting |
| C. Ethylene | iii. Stomatal closure |
| D. GA | iv. Weed-free lawns |
| E. Cytokinins | v. Ripening of fruits |
To increase sugar production in sugarcanes, they are sprayed with ______.
ABA acts antagonistic to ______.
Plant growth substances (PGS) have innumerable practical applications. Name the PGS you should use to
Cause sprouting of potato tuber
Gibberellins promote the formation of ______ flowers on genetically _____ plants in Cannabis whereas ethylene promotes formation of _______ flowers on genetically ______ plants.
In botanical gardens and tea gardens, gardeners trim the plants regularly so that they remain bushy. Does this practice have any scientific explanation?
While experimentation, why do you think it is difficult to assign any affect seen to any single hormone?
To get a carpet like grass lawns are mowed regularly. Is there any scientific explanation for this?
Define parthenocarpy. Name the plant hormone used to induce parthenocarpy.
Fill in the blanks:
Apical dominance is due to ______.
Name a hormone which is gaseous in nature
Name a hormone which is used for killing weeds (dicots)
Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?
