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Flowering plants respond to daily cycles of light and darkness through a process called photoperiodism. This involves sensing the duration of light and dark periods, which triggers physiological changes related to flowering. For example, short-day plants flower when exposed to longer periods of darkness, while long-day plants flower when exposed to shorter periods of darkness. This response allows plants to synchronize their reproductive efforts with seasonal changes in day length.
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How does critical night length control photoperiodism?
Critical night length refers to the minimum uninterrupted period of darkness required to induce a specific response in plants, such as flowering. It is used to determine the photoperiodic response of a plant. When the critical night length is exceeded, certain physiological processes are triggered in the plant, leading to changes in growth, development, and flowering based on the duration of the dark period.
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 will a slime mold develop as a result of altering its life cycle in response to a drought?
In response to drought, a slime mold may develop into a dormant spore stage earlier than usual to increase chances of survival. This stage allows the slime mold to endure harsh conditions until environmental conditions improve.
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.
What is the difference between florigen and phytochrome?
Florigen is a plant hormone responsible for controlling the flowering process in response to environmental cues, while phytochrome is a photoreceptor protein that helps plants detect light quality and quantity for regulating various growth and developmental processes. Florigen specifically influences flowering, while phytochrome has a broader role in light signaling in plants.
How does critical night length control photoperiodism?
Critical night length refers to the minimum uninterrupted period of darkness required to induce a specific response in plants, such as flowering. It is used to determine the photoperiodic response of a plant. When the critical night length is exceeded, certain physiological processes are triggered in the plant, leading to changes in growth, development, and flowering based on the duration of the dark period.
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 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 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.
What are three environmental conditions amoeba sp respond to and what are their response?
seven
Is perspiring a characteristics of life?
Perspiring is an example of one of the characteristics of life. "Response to Stimuli" is said characteristic. It is when an organism triggers a response to its surrounding environment or conditions. Perspiration, or sweat, is a response to nervous stimuli - specifically heat stimuli. So when you feel very hot due to your environment or conditions, you start sweating in response to it.
Under what conditions might a conditioned response become extinct?
A conditioned response may become extinct is the reinforcer is not provided for some time. Consistent reinforcement is necessary to prolong a response.
