NEET > Biology Class 11 > Phytochromes Action Photoperiodicity
Phytochromes Action Photoperiodicity Video Lecture - Biology Class 11 - NEET
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FAQs on Phytochromes Action Photoperiodicity Video Lecture - Biology Class 11 - NEET
| 1. What are phytochromes and how do they work? |  |
Ans. Phytochromes are photoreceptor proteins found in plants that play a crucial role in regulating various physiological processes in response to light. They absorb red and far-red light, undergoing structural changes that allow them to switch between two forms: Pr (inactive) and Pfr (active). This activation triggers a signaling cascade that influences photoperiodicity and other light-dependent responses.
| 2. How do phytochromes control photoperiodicity in plants? | |
Ans. Phytochromes control photoperiodicity by sensing the duration of light and darkness. They measure the length of day and night and transmit this information to the plant's circadian clock. This clock then regulates various physiological and developmental processes, such as flowering, dormancy, and growth, based on the photoperiod information received from phytochromes.
| 3. What is the significance of photoperiodicity in plant growth and development? | |
Ans. Photoperiodicity plays a crucial role in plant growth and development as it allows plants to adapt and optimize their responses based on the changing seasons. For example, the ability to sense day length helps plants determine the right time to flower, adjust their growth patterns, and prepare for environmental changes. It is an essential mechanism for survival and reproduction in many plant species.
| 4. How do phytochromes influence flowering in plants? | |
Ans. Phytochromes regulate flowering in plants by integrating photoperiod information with other environmental cues. They control the production of flowering hormones, such as florigen, which determine when a plant transitions from vegetative growth to reproductive growth. Depending on the specific photoperiodic requirements of a plant species, phytochromes can either promote or inhibit flowering by modulating the expression of genes involved in flowering pathways.
| 5. Can phytochromes be manipulated to control plant growth and development? | |
Ans. Yes, phytochromes can be manipulated to control plant growth and development. Scientists have been studying phytochrome mutants and genetically modified plants to understand their functions better and potentially harness their capabilities for agricultural purposes. By manipulating the expression or activity of phytochromes, it is possible to influence flowering time, seed germination, and other important plant traits. However, further research is needed to fully understand the complexities of phytochrome signaling and its potential applications.
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