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Questions and Answers
What type of plants will flower only under long-day conditions and never under unsuitable photoperiodic cycle conditions?
What type of plants will flower only under long-day conditions and never under unsuitable photoperiodic cycle conditions?
Which type of plants can flower under short-day conditions or inappropriate photoperiods, although flowering may be delayed?
Which type of plants can flower under short-day conditions or inappropriate photoperiods, although flowering may be delayed?
What type of plants have flowering that is promoted by short-day conditions, but can still flower under inappropriate photoperiods?
What type of plants have flowering that is promoted by short-day conditions, but can still flower under inappropriate photoperiods?
Which type of plants require a specific photoperiod for flowering, whereas flowering is delayed under other conditions?
Which type of plants require a specific photoperiod for flowering, whereas flowering is delayed under other conditions?
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What type of plants have flowering that is promoted by long-day conditions, but can still flower under inappropriate photoperiods?
What type of plants have flowering that is promoted by long-day conditions, but can still flower under inappropriate photoperiods?
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What is the name of the hormone-like substance that controls flowering and other plant responses?
What is the name of the hormone-like substance that controls flowering and other plant responses?
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Which of the following chemical substances inhibits flowering?
Which of the following chemical substances inhibits flowering?
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What is the name of the common herbicide that can cause floral induction?
What is the name of the common herbicide that can cause floral induction?
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Which of the following statements is true about gibberellic acid?
Which of the following statements is true about gibberellic acid?
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What is the year in which phytochrome was finally isolated, identified, and named?
What is the year in which phytochrome was finally isolated, identified, and named?
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Which of the following chemical substances can cause floral induction at certain concentrations?
Which of the following chemical substances can cause floral induction at certain concentrations?
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Study Notes
Types of Photoperiodic Plants
- Facultative long-day plants: Flowering is promoted by long-day conditions, but they can still flower under short-day conditions, although flowering is delayed.
- Facultative short-day plants: Flowering is promoted by short-day conditions, but they can still flower under long-day conditions, although flowering is delayed.
Absolute Photoperiodic Plants
- Absolute long-day plants: Flowering absolutely depends on long-day conditions, and they never flower under unsuitable photoperiodic cycle conditions.
- Absolute short-day plants: Flowering absolutely depends on short-day conditions, and they never flower under unsuitable photoperiodic cycle conditions.
Hormonal Control of Flowering
- Flowering is controlled by several hormone-like substances, not just one.
Phytochrome and Light Response
- Phytochrome is a light-receptive component that controls various plant responses, including seed germination, bud dormancy, stem elongation, and petiole development.
- Phytochrome was isolated, identified, and named in 1959.
- Light responses are similar across different plant sections, indicating a common mechanism.
Chemical Stimuli and Floral Induction
- Certain natural and synthetic chemical substances can cause floral induction.
- Examples of auxin-like compounds that induce flowering include indoleacetic acid, naphthaleneacetic acid, and 2,4-dichlorophenoxyacetic acid (2,4-D).
- Gibberellic acid can promote flowering in long-day plants under short-day conditions, but inhibits flowering in short-day plants under the same conditions.
- Other substances that induce flowering or increase flower production include cytokinins, ethylene, acetylene, ethylene chlorohydrin, and 2,3,5-triodobenzoic acid.
- Maleic hydrazide inhibits flowering.
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Description
This quiz covers the different types of plant responses to day length, including facultative and absolute long-day and short-day plants. Understand the effects of photoperiodism on plant flowering and growth.
