Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 36.3, Problem 3R
Summary Introduction
To review:
The hormones, which are active and inactive in a plant, show rapid leaf senescence.
Introduction:
Leaf senescence refers to the aging, in which leaves lose their chlorophyll and expose other colored pigments causing them to be of various colors during autumn. Aging of leaves is under hormonal control and is important for nutrient recycling.
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What are various types of hormones present in plant?
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List some examples of plant hormones.
Chapter 36 Solutions
Life: The Science of Biology
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- A shrub growing in the forest has recently had its shoot apical meristem eaten by a deer. Using your knowledge of plant hormones, how and why will this affect the remaining buds on the shrub shoot and the future growth of the plant aboveground and belowground.arrow_forwardIt was observed during the early 20th century that the abscission zone of leaves of tree growing close to gas burning street lamps weakened (entered the abscission phase) earlier than trees located further away from the lamps. Experiments showed that weakening of the abscission zone was not caused by either the lamp's light or heat. Instead the research on this phenomenon led to the discovery of a new gaseous plant hormone. What is this hormone? Ethylene Abscisic acid (ABA) Gibberellins Auxin Strigolactone Cytokininarrow_forwardHormones and signal pathways Complete the following paragraph to describe signal transduction as it occurs within plants. Choices may be used more than once or not at all. Chemical signals called play an important role in a plant's ability to respond to a stimulus. These signals bind to receptors, the first step in a cellular response called a may be located in the plasma membrane, the cytoplasm, the nucleus, or the endoplasmic reticulum. The series of relay proteins or enzymes activated by the hormone binding the receptor make up the Some responses are immediate, while others require a like Ca*, to initiate a cellular response. The result of the transduction pathway is a which is often the transcription of specific genes, resulting in some measurable change. hormones reflex arc signal transduction pathway Signal transducers second messenger response Receptor proteins first messengerarrow_forward
- Describe the Function of Plant hormonesarrow_forwardDefine what a plant hormone is. Also, explain, using an example for each, of how hormones can both work together and work against each other when they are received by a particular part of a plant.arrow_forwardExplain about Plant Hormones ? WHat is the importance of Plant Hormones ?arrow_forward
- Describe two events or factors that can trigger leaf senescence. In what ways is leaf senescence a recycling process?arrow_forwardDescribe two general chemical features that distinguish plant hor- mones from animal hormones.arrow_forwardWhich hormone(s) is/are responsible for the ability of sunflowers to turn their flowers to track the sun throughout the day? Explain how these hormones work.arrow_forward
- A mutant plant is found in which the seeds germinate far too early. Which hormone is likely involved and why?arrow_forwardBriefly define what a plant hormone is. Also, explain, using an example for each, of how hormones can both work together and work against each other when they are received by a particular part of a plant. In bullet points or short paragraphs. No images.arrow_forwardThis is a required question Which statement describes the role of flowers in plant survival? Flowers can absorb carbon dioxide for sugar production. Flowers produce oxygen through cellular respiration. Flowers contain cells that carry out photosynthesis. Flowers contain cells that produce gametes(sex cells). The diagram below represents a flower, the reproductive struc plants. Most flowers have both male and female structures forarrow_forward
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