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Questions and Answers
Which of the following best defines photoperiodism?
Which of the following best defines photoperiodism?
- The physiological reaction of organisms to the length of night or a dark period (correct)
- The suite of physiological changes that occur in animals in response to changes in day length
- The circadian rhythm of flowering plants
- The developmental responses of plants to the relative lengths of light and dark periods
What are the three groups of plant photoperiodism based on?
What are the three groups of plant photoperiodism based on?
- Presence of photoreceptor proteins
- Relative lengths of light and dark periods (correct)
- Night length, light intensity, and temperature
- Availability of water, nutrients, and sunlight
What is the purpose of photoreceptor proteins in flowering plants?
What is the purpose of photoreceptor proteins in flowering plants?
- To regulate the circadian rhythm
- To convert light energy into chemical energy
- To facilitate photosynthesis
- To sense seasonal changes in night length (correct)
What is the term used to describe the suite of physiological changes that occur in animals in response to changes in day length?
What is the term used to describe the suite of physiological changes that occur in animals in response to changes in day length?
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Which type of plants absolutely require a specific length of either long or short photoperiods to flower?
Which type of plants absolutely require a specific length of either long or short photoperiods to flower?
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Study Notes
Photoperiodism
- Photoperiodism is the ability of plants to respond to the duration of daylight, allowing them to adapt to their environment and optimize growth and reproduction.
Classification of Plant Photoperiodism
- Plants are categorized into three groups based on their photoperiodism:
- Long-day plants, which require a longer period of daylight to flower
- Short-day plants, which require a shorter period of daylight to flower
- Day-neutral plants, which are not affected by the duration of daylight
Photoreceptor Proteins
- Photoreceptor proteins, such as cryptochromes and phytochromes, play a crucial role in flowering plants by detecting light and regulating the expression of genes involved in flowering and development.
Physiological Changes in Animals
- The term "photoperiodic response" describes the suite of physiological changes that occur in animals in response to changes in day length, such as changes in behavior, physiology, and morphology.
Obligate Plants
- Obligate plants are a type of plant that absolutely requires a specific length of either long or short photoperiods to flower, and will not flower under other conditions.
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