CAMPBELL BIO 101 YTC W/MASTBIO >IC<
3rd Edition
ISBN: 9781323002353
Author: Reece
Publisher: PEARSON C
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Chapter 39, Problem 6TYU
If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering?
- (A) 16 hours light/8 hours dark
- (B) 14 hours light/10 hours dark
- (C) 4 hours light/8 hours dark/4 hours light/8 hours dark
- (D) 8 hours light/8 hours dark/light flash/8 hours dark
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If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering? (A) 16 hours light/8 hours dark (B) 14 hours light/10 hours dark (C) 4 hours light/8 hours dark/4 hours light/8 hours dark (D) 8 hours light/8 hours dark/light flash/8 hours dark
Why did plant physiologists propose the existence of a mobile molecule(florigen) that triggers flowering?
We know that short-day plants do not really need short days, but actually long nights. Describe the type of treatment that proves this. Is some kind of light given during the night or some period of darkness given during the day?
Chapter 39 Solutions
CAMPBELL BIO 101 YTC W/MASTBIO >IC<
Ch. 39.1 - What are the morphological differences between...Ch. 39.1 - Cycloheximide is a drug that inhibits protein...Ch. 39.1 - Prob. 3CCCh. 39.2 - Prob. 1CCCh. 39.2 - WHAT IF? If a plant has the double mutation err...Ch. 39.2 - Prob. 3CCCh. 39.3 - If an enzyme in field-grown soybean leaves is most...Ch. 39.3 - WHAT IF? If a plant flowers in a controlled...Ch. 39.3 - MAKE CONNECTIONS Plants detect the quality of...Ch. 39.4 - Prob. 1CC
Ch. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.5 - What are some drawbacks of spraying fields with...Ch. 39.5 - Chewing insects mechanically damage plants and...Ch. 39.5 - Many fungal pathogens get food by causing plant...Ch. 39.5 - WHAT IF? Suppose a scientist finds that a...Ch. 39 - What are two common ways by which signal...Ch. 39 - Is there any truth to the old adage, "One bad...Ch. 39 - Why did plant physiologists propose the existence...Ch. 39 - Plants that have acclimated to drought stress are...Ch. 39 - Prob. 39.5CRCh. 39 - Prob. 1TYUCh. 39 - Prob. 2TYUCh. 39 - Prob. 3TYUCh. 39 - How may a plant respond to severe heat stress? (A)...Ch. 39 - Level 2: Application/Analysis 5. The signaling...Ch. 39 - If a long-day plant has a critical night length of...Ch. 39 - Prob. 7TYUCh. 39 - DRAW IT Indicate the response to each condition by...Ch. 39 - Level 3: Synthesis/Evaluation 9. EVOLUTION...Ch. 39 - SCIENTIFIC INQUIRY A plant biologist observed a...Ch. 39 - SCIENCE. TECHNOLOGY, AND SOCIETY Describe how our...Ch. 39 - Prob. 12TYUCh. 39 - Prob. 13TYU
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- A long day plant is given a long night, and is interrupted by a light pulse in the middle of the night. Which quality of the light pulse will most likely prevent flowering? Select one: a. UV light b. green light c. red light d. far-red lightarrow_forwardAn orchid plant is growing on the branch of mango tree.How do you describe this interaction between the orchid and the mango tree?arrow_forwardIf green plants require light in order to produce food needed for growth, why are seedlings that are germinated in the dark taller than those of the same age grown in the light?arrow_forward
- Which of the following is false about the phytochrome protein?a. There are two convertible forms.b. It primarly absorbes blue wavelengths of light.c. It is involved in seed germination.d. It is involved in plant sensing of spacing.arrow_forwardPredict whether flowering in a short day plant with a minimum critical length of 14 hours would be expected to occur in the following situations. The plant is exposed to 15 hours of daylight and 9 hours of darkness uninterrupted. The plant is exposed to 9 hours of daylight and 15 hours of darkness. The plant is exposed to 9 hours of daylight and 15 hours of darkness, with 10 minutes exposure to red light in the middle of the night.arrow_forwardStudies of phototropism often use which part of an oat seedling: _________________?arrow_forward
- Will a long-day plant (LDP) bear flowers after it was subjected to nights interrupted by flashing red light?arrow_forwardPhytochrome is a plant pigment protein that: a. mediates plant infection b. promotes plant growth c. mediates morphological changes in response to red and far-red light d. inhibits plant growtharrow_forwardSeed germination is stimulated by _____; stem elongation is stimulated by ____________ Select one: a. far-red light, far-red light b. red light, far-red light c. red light, red light d. far-red light, red light e. none of the abovearrow_forward
- Which of the following statements is false? a. Auxin and gibberellin promote stem elongation b. Cytokinin promotes cell division in shoot tips c. Abscisic acid promotes water loss and dormancy d. Ethylene promotes fruit ripening and abscission.arrow_forwardExplain how varying amounts of light and darkness induce flowering.arrow_forwardOwners and managers of plant nurseries have to plan lighting schedules lor a long-day plant that will flower in February. What lighting periods will be most effective? What color of light should be chosen?arrow_forward
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