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How does critical night length control photoperiodism?
Photoperiodism is the response of the plant to daylight and darkness. For short day plants it will bloom in darkness and when darkness exceeds critical night length, for long day plants it will bloom during daylight and when darkness is less than the critical night length.
What are the differences between long day and short day plants in terms of their response to the length of daylight?
Long day plants require a certain minimum amount of daylight to flower, while short day plants need a certain maximum amount of daylight to flower. This difference in response to daylight length affects when these plants bloom.
What action occurs with a hyperreflexic response?
A hyperreflexic response is characterized by exaggerated reflexes in response to stimuli, such as brisk muscle contractions in reaction to a tap on the knee. This can be a sign of certain neurological conditions or spinal cord injuries.
What is the difference between florigen and phytochrome?
florigen )its a hormone responsible for inducing flowering in plants directly )moves from leaves to the apex inducing flowering by phloem mechanism )no inter conversion from one phase to other phytochrome )it is a light absorbing pigment which induces flowering in long day plants )pigments p660 and p730 absorb red and far red light respectively )p660absorbs red light and immediately converts into p730 and as p730 absorbs far red light which induces flowering thus flowering is induced in long day plants because p730 is present in day
What causes the stomata on leaves to open?
Stomata open in response to environmental factors such as light intensity, CO2 levels, and humidity. Light triggers the production of a hormone called abscisic acid, causing the guard cells around the stomata to swell and open. Conversely, in darkness or when environmental conditions are unfavorable, the stomata close to prevent water loss through transpiration.
How does critical night length control photoperiodism?
Photoperiodism is the response of the plant to daylight and darkness. For short day plants it will bloom in darkness and when darkness exceeds critical night length, for long day plants it will bloom during daylight and when darkness is less than the critical night length.
The growth response related to the number of hours of daylight and darkness is called?
photosynthesis
What is critical night length?
Critical night length is the duration of darkness required for a plant to initiate or cease a biological process such as flowering or seed germination. It varies among plant species and is important for regulating their growth and development in response to changes in daylight.
What plant requires 12 or more hours of darkness?
The plant that requires 12 or more hours of darkness is typically known as a "short-day" plant. These plants, like chrysanthemums and poinsettias, initiate flowering in response to longer nights and shorter days, usually requiring a minimum of 12 hours of uninterrupted darkness. This triggers the production of flowering hormones, allowing them to bloom during the fall and winter months. Proper light and dark cycles are crucial for their growth and flowering success.
Why are my potatoes flowering?
Potatoes flower when they are stressed or exposed to long days of sunlight. This can happen due to changes in temperature, moisture levels, or other environmental factors. Flowering is a natural response of the potato plant to these conditions.
What stimulus cause the leaves of touch me nots(mimosa) to shrink?
The nyctinastic movement which occur due to physical stimuli causes the leaves to rapidly droop or shrink.The leaves also shrink in response to darkness or daylight
What hormone is released in response to darkness and is suppressed by light?
melatonin
What are the differences between long day and short day plants in terms of their response to the length of daylight?
Long day plants require a certain minimum amount of daylight to flower, while short day plants need a certain maximum amount of daylight to flower. This difference in response to daylight length affects when these plants bloom.
What are the differences between responses of mammals and flowering plants?
Mammals typically respond to their environment through behavior and physiological changes, such as seeking shelter or regulating body temperature. Flowering plants, on the other hand, respond through growth patterns, altering leaf orientation, or flowering in response to light or temperature changes. Both organisms have evolved different mechanisms to adapt and survive in their respective environments.
What are some learned behavior of a cactus?
Some learned behaviors of a cactus include adaptation to environmental conditions such as water scarcity by storing water in their stems, developing thorns for protection against herbivores, and flowering in response to specific triggers like temperature or light patterns.
Why the size of pupil decrease in brightness and increase in darkness?
The size of the pupil decreases in bright light to reduce the amount of light entering the eye, protecting it from damage. In darkness, the pupil enlarges to allow more light to enter the eye, enhancing visibility in low-light conditions. This process is controlled by the iris muscles in response to changes in ambient light levels.
Bacon's Rebellion was in response to what?
worsening economic conditions in Virginia.
