Concept explainers
To determine: The percentage of the plant flower in the given figure when the day length is 10 hours and the night length is 14 hours.
Introduction: Photoperiodism is the behavioral response shown by the organisms, especially plant species, to the length of the day or night. Each plant has its characteristic photoperiod that is very essential for its normal growth and reproduction.
To determine: The percentage of the plant flower in the given figure when the day length is 16 hours and the night length is 8 hours.
Introduction: Photoperiodism is the behavioral response shown by the organisms especially plant species to the length of the day or night. Each plant has its characteristic photoperiod that is very essential for its normal growth and reproduction.
To determine: The critical night length for the plant in the given figure.
Introduction: Photoperiodism is the behavioral response shown by the organisms especially plant species to the length of the day or night. Each plant has its characteristic photoperiod that is very essential for its normal growth and reproduction.
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Chapter 38 Solutions
BIOLOGY >PRINT UPGRADE<
- Compare wind-pollinated and animal pollinated seed vascular plants in terms of the following characteristics: -Pollination method -Relative efficiency of pollination method -Plant types -Reproductive organs -Adaptations that promote pollination. Tabulate your answersarrow_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_forwardDefine the term pollination. Differentiate between self pollination and cross pollination. What is the significance of pollination?arrow_forward
- What is the relationship between light intensity and the rate of photosynthesis. Make a prediction about this relationship, and identify both independent and dependent variables in the prediction. What will be a suitable hypothesis predict answers for the following: A) what is the rate of germinating peas versus non-germinating peas. B) what is the effect of temperature on germinating peas?arrow_forwardDiscuss the role of phytohormones, fertilizers and pesticides, and genetic engineering in the development and growth of plants. Describe how the environment has a significant impact in plant growth and development.arrow_forwardWatch the suggested videos for Plants Response to Stimuli. a. GeotropismGeotropism Experiment (2:48 minutes)https://www.youtube.com/watch?v=AEo5UsPeB5gb. PhototropismPhototropism Experiment (2:16 minutes)https://www.youtube.com/watch?v=WZ1NRP3OF5w a. For each experimental set up (geotropism and phototropism), identify the dependent and independent variables that have contributed to how plants responded to the stimuli.arrow_forward
- Predict 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_forwardSelect the correct adaptation:advantage match. seeds : dormancy pollen : sporophyte disperal fruit : pollination spore : dormancyarrow_forwardA team of researchers investigated the effects of phosphorous availability and light intensity on an angiosperm species. Seeds of the angiosperm were divided into four equal groups. Groups 1 and 2 were exposed to 200 μmol, and Groups 3 and 4 were exposed to 500 μmol. Groups 2 and 4 also received a phosphorous (P) solution. After 20 days, all plants were weighed, and the average dry weight of each group was calculated. The results are in the table below. Group 1(200 μmol, no P) Group 2(200 μmol, + P) Group 3 (500 μmol, no P) Group 4 (500 μmol + P) Average Dry weight (g) 0.8 1.1 1.5 6.2 Describe the effects of light and phosphorous on the growth of the plants in this study. Explain how the metabolic processes associated with the plant kingdom likely influenced these results.arrow_forward
- The data that is attached below was collected during a lettuce seed ecotoxicity assay. Lettuce seed assays are used to compare the ecotoxicity of methanol, ethanol, and isopropanol by these alcohols' effects on germination rate and root elongination. Using the attached data, help answer which alcohol seems to be the most toxic to lettuce seeds. Why or why not would your results be expected? What does this information tell you about using ecotoxicity data to estimate human toxicity?arrow_forwardLook at the image Describe the color and texture of each part of the plants and indicate the function of each part as well. What is the nature and function of the pedicel and receptacle? Are all parts of the flower separate from each other or are they fused together? Does pollination in this plant occur via wind or an animal vector?arrow_forwardTobacco plants invest a lot of resources into the production of secondary compounds know as alkaloids (e.g., nicotine) that we believe act as defenses against herbivores. The researchers did an experiment where they added a hormone that reduces the production of alkaloids. In graph (a), the data show that the hormone reduced the proportion of alkaloids as a function of leaf mass relative to controls- so the hormone worked. They also measured the lifetime seed production of the plants in both treatments without any herbivores present (b). They had the following results. What might you conclude/hypothesize/investigate based on the data in graph (b) (a) Chemical defenses (percent of leaf mass) 1.8% 1.4 1.0 0.6 0.2 No hormone added Hormone added (b) Lifetime seed mass (g/plant) -18 14 10 No hormone added Hormone added It would be good to test whether the hormone is very specific or whether it might also cause changes in other metabolic processes The hormone has no effect on the lifetime…arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
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