BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
3rd Edition
ISBN: 9781260670929
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 22, Problem 7MCQ
Summary Introduction
Introduction:
Photoperiodism is defined as the day length that affects many aspects of plant’s life[a1] . And it regulates flowering. The long-day plants' flower when days are longer than a critical length, which is 9 to 16 hours. The short-days plant, flower when days are shorter than the critical length, usually in summer or fall. The day-neutral plants flower at maturity, regardless of the day length.
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Next, the researcher wanted to determine if the timing of the flash of ight,
whether It was early or late into the dark perlod, had an affect on the flowering
plants. The researcher exposed Xanthlum strumarlum plants to a cycle of 12
hours light/12 hours dark and exposed the plants to a 10 minute burst of light at
different times within the dark perlod. She recorded the percent of flowering
plants post exposure. The data is in the chart below. 6. What conclusions can you
draw from this data? (You do not need to show a graph, but it may help with your
answer.) *
% of
plants
flowering
Time of burst of
light (from the
beginning of
dark period)
100
86
35
41
10
78
12
95
21
4-
8.
A short-day plant flowers only when exposed to light for less than 12 hours
long. Which of the following would cause the plant to flower? *
O a 13-hour night and 11-hour day with 1 minute of darkness after 6 hours
a 12-hour day and 12-hour night with a flash of red light
an 8-hour day and 16-hour night with a flash of white light after 8 hours
O a 9-hour night and 15-hour day with 1 minute of darkness after 7 hours
24 hours of continuous light
A long-day plant will flower if
Select one:
O the duration of continuous light is less than a critical length.
O the duration of continuous light exceeds a critical length.
O the duration of continuous darkness is less than a critical length
O it is kept in continuous far-red light.
O the duration of continuous darkness exceeds a critical length.
Chapter 22 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
Ch. 22.1 - What adaptations contribute to the reproductive...Ch. 22.1 - Prob. 2MCCh. 22.1 - Prob. 3MCCh. 22.2 - Label as many flower parts as possible in the...Ch. 22.2 - How does pollen move from one flower to another,...Ch. 22.2 - Prob. 3MCCh. 22.2 - Prob. 4MCCh. 22.2 - Prob. 5MCCh. 22.2 - Prob. 6MCCh. 22.2 - Prob. 7MC
Ch. 22.3 - Prob. 1MCCh. 22.3 - Prob. 2MCCh. 22.3 - Prob. 3MCCh. 22.4 - Prob. 1MCCh. 22.4 - Prob. 2MCCh. 22.4 - List the major classes of plant hormones, and name...Ch. 22.4 - Prob. 4MCCh. 22.5 - Prob. 1MCCh. 22.5 - How does light help regulate flowering time?Ch. 22.6 - Prob. 1MCCh. 22.6 - Prob. 2MCCh. 22 - The new gene combinations associated with sexual...Ch. 22 - Prob. 2MCQCh. 22 - Where would you find a male gametophyte? a. Inside...Ch. 22 - Prob. 4MCQCh. 22 - Prob. 5MCQCh. 22 - Prob. 6MCQCh. 22 - Prob. 7MCQCh. 22 - 8. What type of tropism is adaptive to a...Ch. 22 - Prob. 1WIOCh. 22 - Prob. 2WIOCh. 22 - Prob. 3WIOCh. 22 - Prob. 4WIOCh. 22 - Prob. 5WIOCh. 22 - Prob. 6WIOCh. 22 - Prob. 7WIOCh. 22 - Prob. 8WIOCh. 22 - Prob. 9WIOCh. 22 - Prob. 10WIOCh. 22 - Prob. 11WIOCh. 22 - What is the function of photoreceptors?Ch. 22 - Prob. 13WIOCh. 22 - Prob. 14WIOCh. 22 - Prob. 15WIOCh. 22 - Prob. 16WIOCh. 22 - Prob. 1SLCh. 22 - Prob. 1PITCh. 22 - Prob. 2PITCh. 22 - Prob. 3PITCh. 22 - Prob. 4PIT
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardIn the Philippines, owners and managers of plant nurseries have to plan lighting schedules for a long-day plant (LDP) with a critical night length of 10 hours that will flower in December. What lighting periods and color of light enrichment will be most effective for flowering of the said LDP? A. Light periods of 15 hours with light enriched in the red range of the spectrum B. Dark periods of 11 hours with light enriched in the red range of the spectrum C. Light periods of 14 hours with light enriched in the far-red range of the spectrum D. Dark periods of 9 hours with light enriched in the far-red range of the spectrum E. Light periods of 13 hours with light enriched in the red range of the spectrum F. Dark periods of 10 hours with light enriched in the far-red range of the spectrumarrow_forwardChrysanthemums are long-night plants that normally flower in thefall. If you could manipulate photoperiod, what would be the simplestway to prevent mums from blooming (without killing the plants)?arrow_forward
- Owners and managers of plant nurseries have to plan lighting schedules for a long-day plant that will flower in February. What lighting periods will be most effective? What color of light should be chosen?arrow_forwardIf a plant flowers in a controlled chamber with a daily cycle of 10 hours of light and 14 hours of darkness, is it a short-day plant? Explain.arrow_forwardWe 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?arrow_forward
- Will a long-day plant (LDP) bear flowers after it was subjected to nights interrupted by flashing red light followed by far-red light? *arrow_forward1. A short-day plant flowers only when exposed to light for less than 12 hours long. Which of the following would cause the plant to flower a 12-hour day and 12-hour night with a flash of red light b. an 8-hour day and 16-hour night with a flash of white light after 8 hours c. 9-hour night and 15-hour day with 1 minute of darkness after 7 hours d. 13-hour night and 11-hour day with 1 minute of darkness after 6 hours e. 24 hours of continuous lightarrow_forwardThe researcher presented her findings to her colleagues. They noted that this experiment falled to provide evidence to support the length of daylight as the critical perlod responsible for the plant knowing when to flower. What If it was length of night, or the absence of light, that was critical for the flowering of the plant? With this information, she revised her experiment by exposing the plants to a flash of light during the periods of darkness, and a flash of darkness during periods of light. 4. What are the controls in this experiment?* Light Dark Shrs 12hrs 24 hoursarrow_forward
- Owners 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_forwardLight is often the most important environmental factor for inducing a plant to flower, but it is not the intensity of light. What it the important aspect?arrow_forwardWill a long-day plant (LDP) bear flowers after it was subjected to nights interrupted by flashing red light?arrow_forward
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