in photophysiological process (induction and inhibition of flowering) is called Phytochrome . Besides photoperiod certain plants require a low temperature in the earlier stages for flowering. Many biennial and perennial plants are induced to flower by low temperature ( o C to o C). This process is called vernalization and the reversal effect of vernalization is called devernalization .
The condition of a seed when it fails to germinate even in suitable environmental condition is called seed dormancy . Thus, dormancy can be overcome by following methods such as scarification, impaction, stratification, alternating temperatures and light. Senescence refers to all collective, progressive and deteriorative processes which ultimately lead to complete loss of organization and function. Senescence is of four types and they are overall, top, deciduous and progressive.
Senescence is controlled by plant’s own genetic programme. Death of the plant or its parts consequent to senescence . Write the physiological effects of Cytokinins. .
Describe the mechanism of photoperiodic induction of flowering. . Give a brief account on Programmed Cell Death (PCD) . Seed dormancy allows the plants to a.
overcome unfavourable climatic conditions b. develop healthy seeds c. reduce viability d. prevent deterioration of seeds .
Which one of the following method are used to break the seed dormancy? a) Scarification b) Impaction c) Stratification d) All the above. Web