BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<
12th Edition
ISBN: 9781264058167
Author: Raven
Publisher: MCG CUSTOM
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Chapter 39, Problem 3S
The current model for gravitropism suggests that the accumulation of amyloplasts on the bottom of a cell allows the cell to sense gravity. Suggest a plausible mechanism for the sensing of gravity that does not involve the settling out of panicles.
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Chapter 39 Solutions
BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<
Ch. 39.1 - Compare the pigments phytochrome and chlorophyll.Ch. 39.1 - List growth responses influenced by phytochrome.Ch. 39.1 - Prob. 3LOCh. 39.2 - Prob. 1LOCh. 39.2 - Prob. 2LOCh. 39.3 - Prob. 1LOCh. 39.3 - Prob. 2LOCh. 39.3 - Prob. 3LOCh. 39.4 - Prob. 1LOCh. 39.4 - Prob. 2LO
Ch. 39.4 - Identify the types of biological molecules that...Ch. 39.5 - Discuss properties of hormones.Ch. 39.5 - Prob. 2LOCh. 39.5 - Prob. 3LOCh. 39 - Prob. 1DACh. 39 - Prob. 1IQCh. 39 - Prob. 2IQCh. 39 - Propose a mechanism to explain how seedlings could...Ch. 39 - Which of the following is stimulated by blue...Ch. 39 - Prob. 2UCh. 39 - Prob. 3UCh. 39 - Prob. 4UCh. 39 - Which of the following does NOT happen as a seed...Ch. 39 - Dwarf mutants can sometimes be induced to grow...Ch. 39 - Prob. 1ACh. 39 - If you were to plant a de-etiolated (det2) mutant...Ch. 39 - Prob. 3ACh. 39 - Which of the following defects would prevent...Ch. 39 - You have come up with a brilliant idea to stretch...Ch. 39 - You have identified a mutant Arabtdopsis plant...Ch. 39 - Which of the following might not be observed in a...Ch. 39 - Prob. 1SCh. 39 - Prob. 2SCh. 39 - The current model for gravitropism suggests that...Ch. 39 - Prob. 4S
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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
- Which of the following statements about gravity perception is FALSE? A. Statoliths are specialized amyloplasts B. Statoliths are found in statocytes C. Gravity is sensed from the root cap acropetally through the zone of division D. Columella cells sense gravity through statolith pressure on the endoplasmic reticulum E. Auxin is the main hormone involved in gravity responsearrow_forwardUsing the provided figure, describe the importance of the two phytochrome systems in controlling de-etiolation and green stem elongation under full sun and shade. Include the key mechanisms and temporal changes in control of this process.arrow_forwardFigure 4 shows an open stoma during a gaseous exchange process in a plant. Elaborate the gaseous exchange process in plants with considering the influence of Y to the turgidity of guard cells.arrow_forward
- If the PIN2 gene is rendered non-functional by mutation it dramatically reduces the speed of the gravitropic response in the root. Explain what PIN proteins do and why the loss on PIN2 would likely affect the speed of the gravitropic response.arrow_forwardWhich type of the following play a role in the gravitropic response of plants according to the statolith hypothesis? amyloplasts chloroplasts receptors calcium ions O O O Oarrow_forwardThe figure attached shows an open stoma during a gaseous exchange process in a plant. A) What is 'y'? B) Elaborate the gaseous exchange process in plants by considering the influence of 'y' on the turgidity of guard cells.arrow_forward
- A tobacco plant has successfully fended off plant pathogen via hypersensitive response (HR). (i) What would you be able to observe on the plant and explain the processes that happened at cellular level? What are the benefits for the tobacco plant that has developed systemic acquired resistance (SAR) in comparison to HR? (ii) (ii) Name the chemical compounds responsible in triggering SAR and how would this signal be transmitted?arrow_forwardPlant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. a) Describe the plant’s response to the presence of light. (refer to picture)arrow_forwardGive an example of an environmental condition where stomates are unable to maintaincooling of the leaf and heat stress occurs. Explain the consequences of heat stress onphotosynthesis, membrane integrity and proteins.arrow_forward
- What is the gravity receptor involved in gravitropism?arrow_forwardGreen mangoes were freshly harvested from tree and buried in a jar of uncooked rice to accelerate ripening process. During storage, the fruit colour has changed to yellow. Explain the principles behind this ripening process by relating to the fruit tvne and identify the phytohormone responsible for this ripening process. (i) Suggest another simple method to expedite the ripening process with another fruit of the same type. Marks will be awarded for the correct type of materials (fruit), method and experimental set up (temperature and space). (ii)arrow_forwardPhytochrome, plays an important role in flowering in many plants. It can also be used to determine when lettuce seeds germinate (shown in the figure below Which scenario(s) above produce large amounts of the active form of phytochrome? A B A & C B & Darrow_forward
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