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Refrigerated fruits maintain flavour and taste for longer period due to:-
Refrigerated fruits maintain flavour and taste for longer period due to the slower rate of respirations. In low temperature. the respiration rate of fruits is minimised.
The biological clock measures the length at each night by the?
The biological clock measures the length of each night by the relative amount at red absorbing and far-red absorbing phytochrome present at dawn.
Which one of the following generally act as an antagonists to gibberellins?
Abscisic Acid (ABA) is also called stress hormone. It is mildly acidic growth hormone which functions
as a general growth inhibitor by counteracting other hormones (auxin, gibberellin, cytokinin) or reactions mediated by them. It causes stomatal closure, abscission of flower and fruits while gibberellin helps in opening of stomata and promote development of fruits.
A physiological response of plants to the duration of light and darkness is a:-
Photoperiodism is the response of plants to the relative length of day and night. Phototaxis is axis (movement) in which the stimulus is light. Phototropism is tropism in which stimulus is light, i.e., bending of plant towards light.
ABA is involved in?
Abscisic acid (ABA) is a growth inhibitor, which is involved in seed dormancy. Dormant seeds germinate when ABA is overcome by gibberelllns. ABA cause dormancy in axillary buds and acts as stress hormone in adverse environmental conditions.
Hypothetical plant hormones are:-
The commonly recognised class of plant hormones are auxin, gibberellin, cytokinin, ABA and ethylene. Some scientist believes that flower initiation is controlled by plant hormones callen florigen. A German plant physiologist George Melchers has also proposed the existance of vernalin (i.e., vernalisation initiating substance). Both these hormones are not been isolated so far. So, it still remains to be a hypothetical chemical.
The application of synthetic plant hormone like IAA, IBA and NAA are best described as:-
Indole acetic acid, indole butyric acid and napthalene acetic acids, are synthetic auxins. These synthetic auxin are used to prevent pre fall of fruit. 2, 4-D is used in apple and and orange NAA is used in tomatoes. The application of these synthetic auxin on unpollinated pistils develops them into parthenocarpic fruits.
Organogenesis or morphogenesis in tissue culture is controlled/regulated by phytohormones the credit of this important discovery goes to
Organogenesis or morphogenesis is the regeneration of an organ from the undifferentiated mass of cells. Which is best known as callus. Skoog and Miller(1957) showed that appropriate concentration of phytohormone auxin and cytokinin stimulate the morphogenesis or organogenesis. Higher concentration of auxin with cytokinin promotes cell division in roots while higher concentration of cytokinin with auxin stimulate cell division in roots.
Natural cytokinins are sythesized in tissue that are:-
Natural cytokinins are synthesized in tissue that are rapidly dividing
N6- furfurylamino purine and kinetin are derivative of …….
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15.4 Plant Growth Regulators
15.4.1 Characteristics
Plant Growth And Development
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