Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
Chapter 30, Problem 2CT
Photosynthesis sustains plant growth, and inputs of sunlight sustain photosynthesis. Why, then, do seedlings that germinate in a fully darkened room grow taller than seedlings or the same species that germinate in full sun?
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Photosynthesis occurs in the chloroplasts packed within the mesophyll cells. Summer leaves are green because they contain about 50 times more chlorophyll than carotenoids. But during the fall, carotenoids have their season of glory because chlorophyll breaks down first, revealing the striking orange and yellow colors of carotenoids, which were there all along. The changes that leaves undergo before they fall off allow the plant to reclaim nutrients from the leaves for storage and use the following spring. How do these nutrients leave the leaf ?
Photosynthesis ceases when leaves wilt, mainly because(A) the chlorophyll in wilting leaves is degraded.(B) accumulation of CO2 in the leaf inhibits enzymes.(C) stomata close, preventing CO2 from entering the leaf.(D) photolysis, the water-splitting step of photosynthesis,cannot occur when there is a water deficiency.
Which is an example of Phototropism?
A) roots of a plant following water
B) plant bending toward the light
C) roots growing into the soil
D) a venus flytrap capturing a fly
Chapter 30 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 30 - Prob. 1SQCh. 30 - _______ is the hormone in most rooting compounds....Ch. 30 - Which of the following statements is false? a....Ch. 30 - Prob. 4SQCh. 30 - Ethylene differs from other hormones in that it...Ch. 30 - Heliotropism may be related to ________ a. photo...Ch. 30 - Prob. 7SQCh. 30 - Prob. 8SQCh. 30 - Volatile Secondary Metabolites in Plant Stress...Ch. 30 - Volatile Secondary Metabolites in Plant Stress...
Ch. 30 - Volatile Secondary Metabolites in Plant Stress...Ch. 30 - Volatile Secondary Metabolites in Plant Stress...Ch. 30 - Stomata dose in response to ________ a. ABA b....Ch. 30 - Prob. 10SQCh. 30 - Match the hormonewith the characteristic. _____...Ch. 30 - Match the hormone with the observation. ____...Ch. 30 - Professional gardeners often soak seeds in...Ch. 30 - Photosynthesis sustains plant growth, and inputs...Ch. 30 - Prob. 3CTCh. 30 - Cattle in industrial dairy farms are typically...Ch. 30 - The oat coleoptiles on the left have been...
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- Would a plant be able to grow to maturity and produce seeds if kept in total darkness? Why?arrow_forwardWhat is the major trade-off plants face when they undergo photosynthesis? When they open their stomata to let in oxygen, they can lose water. When they open their stomata to release oxygen, they can lose water. When they open their stomata to let in carbon dioxide, they can lose water. When they open their stomata to let in water, they can lose carbon dioxide.arrow_forwardHow do C4 plants minimize photorespiration? Multiple Choice Stomata are only opened at night, storing carbon dioxide in the stroma. During the day, the carbon dioxide is released for photosynthesis. Carbon dioxide is fixed twice in different cells. The Calvin cycle occurs in the bundle sheath cells where oxygen concentrations are lower. Carbon dioxide is fixed twice in different cells so that carbon dioxide does not come into contact with rubisco. Stomata are only opened at night, storing oxygen in malate. During the day, the oxygen is released for photosynthesis. Stomata are only opened at night, storing carbon dioxide in malate. During the day, the carbon dioxide is released for photosynthesis.arrow_forward
- Closed stomata ________. a. limit gas exchange b. permit water loss c. prevent photosynthesis d. absorb lightarrow_forwardThere is a trade-off between photosynthesis and transpiration in leaves because (a) numerous stomatal pores provide both gas exchange for photosynthesis and openings through which water vapor escapes (b) a waxy layer, the cuticle, reduces water loss (c) blue light triggers an influx of potassium ions (K+) into the guard cells (d) leaves of deciduous plants abscise as winter approaches in temperate climates (e) stomata are closed at night, although water continues to move into the roots by osmosisarrow_forwardJaden grows geraniums in his greenhouse. He has noticed that his flowers are not growing very well. The greenhouse is in the shade for much of the day and maintains a temperature of 23°C (74°F). What might be the problem and how could Jaden do to fix it?arrow_forward
- In hot, dry climates, plants have evolved mechanisms to avoid photorespiration. Which of the following is FALSE Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d C3 plants have no mechanism to avoid photorespiration C4 plants reduce photorespiration by separating the light reaction in the mesophyll cells from the light- independent reaction in the bundle-sheath cells CAM plants minimize photorespiration by collecting and storing CO2 at night and keeping their stomata closed during the day C4 plants include corn, sugarcane, and many grasses CAM plants can undergo photophosphorylation in the absence of sunlight 7 Open in Readinarrow_forwardIf a C3 plant that normally closes its stomata during hot, dry conditions were triggered to open them instead, the most likely outcome would be that O water leaves the leaf, decreasing the rate of photosynthesis O glucose leaves the leaf, increasing the rate of photosynthesis O CO₂ enters the leaf, decreasing the rate of photosynthesis O O₂ enters the leaf, increasing the rate of photosynthesis more chlorophyll is made, increasing the rate of photosynthesisarrow_forwardJapanese gardeners regularly trim away parts of the root system to assist in dwarfing a Bonsai plant. A plant’s food is obtained through photosynthesis in the leaves; can you suggest why trimming the roots can cause dwarfing?arrow_forward
- In hot, dry climates, plants have evolved mechanisms to avoid photorespiration. Which of the following is FALSE Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d e C3 plants have no mechanism to avoid photorespiration C4 plants reduce photorespiration by separating the light reaction in the mesophyll cells from the light- independent reaction in the bundle-sheath cells CAM plants minimize photorespiration by collecting and storing CO2 at night and keeping their stomata closed during the day C4 plants include corn, sugarcane, and many grasses CAM plants can undergo photophosphorylation in the absence of sunlight Open in Readirarrow_forwardA) The concentration of CO2 is lower inside a plant cell than in the atmosphere (outside the cell). In your own words, describe how the CO2 levels are kept low inside the plant cell and explain why this is necessary. Assume stomata are open. B) Regarding the situation presented in Part A and assuming that the stomata of the plant leaves are closed, would this favour the induction of photorespiration in a C3 plant? Explain. Make reference to relevant molecule or molecules as needed. Please clearly label your responses as A and Barrow_forwardBut how are the two types of mesophyll involved? From what I understand, CO2 enters the stomata, and then the citric acid cycle of the mitochondia in the mesophyll use the carbon atoms do produce glucose, which then goes through phloem loading and it either used or stored. My question, I guess, is how exactly are the two types of mesophyll involved? Is only one used or are both used at different times in the production of the glucose?arrow_forward
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Photosynthesis & Respiration | Reactions | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=3XIyweZg6Sw;License: Standard YouTube License, CC-BY