To explain: That how differences in red to far-red light ratio arise and the impact they have on plants grown in different environments.
Introduction: The plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. The parts of plants include stem, roots, leaves, flowers, fruit, and seeds. The leaves are a part of plants that are generally green and attached to it by a stalk or stem.
Explanation of Solution
The red light is absorbed by the leaves at a greater rate than the far-red light, as the sunlight passes by the canopy. The relative amounts of far-red and red light are integrated by plant signaling through phytochrome to regulate the growth and development of plants. For example, germination of seed is inhibited as the relative amount of far-red light increases. Therefore, in a below shady canopy, germination of seeds would have less chance of survival because of reduced photosynthesis. Alternatively, the information about the reduced sunlight could signal rapid elongation of stem to get the plants closer to adequate sunlight for photosynthesis.
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Chapter 39 Solutions
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- Below are pictures of leaves from a Garry Oak tree (Quercus garryana). These leaves are found on the same tree, however, the top cross section is of a leaf in the lower canopy, which is relatively shaded. The other of the upper canopy, which is exposed to more sun. ENCER 40x (x.s.) Describe two differences between sun and shade leaves at the macroscopic (leaf) and two differences at the microscopic (cross section) scale and provide explanations for the differences observed in color (specific chlorophyll a vs. b enrichment and accessory pigments) and shape (leaf thickness and width). Note: You do not need to sketch out the leaf/slides.arrow_forwardA 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.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_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_forwardIdentify which of the following statements is a lie? Select one: a. Plants cannot absorb wavelengths between 350nm to 1pm and wavelengths between 800nm-1mm. b. Plants are more likely to die and not survive if they have malfunctional pigments or no pigments at all. c. Leaves have green coloration and carrots have orange coloration because the pigments responsible for the coloration absorb wavelengths that correspond to the green color for leaves and orange color for carrots.arrow_forwardWhat are the similarities and differences between the phototropic response of a plant shoot and the response of the pupil of a human eyes in response to light?arrow_forward
- 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 lightarrow_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_forwardWill a long-day plant (LDP) bear flowers after it was subjected to nights interrupted by flashing red light followed by far-red light? *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_forwardIn 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 you plant a munggo seen in a box with small amount of light entering it, what will be the potential error that can affect the growth of the plant?arrow_forward
- Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax