Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 34, Problem 7TYU
Summary Introduction
To review:
The functions of cuticle and stomata. Further, describe how the number of stomata and thickness of cuticle differ in the plants of dry and wet habitats.
Introduction:
The cuticle is a lipid layer with wax that is present on the surface of the leaves, shoots, and other aerial organs. The stomata are the pore-like structures present on the leaves, stems, and some other organs.
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About STOMATA
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What is the advantage of having more stomata on the lower portion of the leaf rather than on the upper portion? Was this true for the monocot leaf as well? What conclusions about stomata placement can you make from these observations?
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What effect does room temperature affect the stomata? Does it open or close?
Chapter 34 Solutions
Biological Science (7th Edition)
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- Stomata are pores on the surface of plant leaves that allow for gaseous exchange. The numbers below shows the density of stomata on the leaf surfaces of three species of plants. Based on this information, which statement is incorrect? Stomata Density: Elodea (upper epidermis) = 0, (lower epidermis) = 0, Water Lily (upper) = 420, (lower) = 0, Black Walnut (upper) = 0, (lower) = 465 a) Since Elodea does not have any stomata, it does not carry out photosynthesis. b) In Elodea’s aquatic environment, stomata are not used to control gas exchange. c) Since black walnut trees thrive on land, stomata are located on lower surface to decrease the amount of water lost in the heat of the sun. d) Since water lilies live on the surface of water, transpiration occurs from the upper epidermis because that is where it is in contact with air.arrow_forwardis energy required to open stomata?arrow_forwardHow is opening and closing of stomata regulated?arrow_forward
- How do plants control the opening and the closing of stomata?arrow_forwardwhy do stomata open due to high humidity?arrow_forwardWhich is true regarding regulation of stomata? Light provides a signal leading to the pumping of K+ and Cl- out of the guard cells Low CO2 concentration in leaves is a signal to close stomata Abscisic Acid is a hormone that signals for stomata to open Stomata remain open under hot, dry conditions If guard cells are turgid (full of water), the stomatal pore is openarrow_forward
- What is the advantage of closed stomata when water is in short supply?arrow_forwardDiscuss which pathway permits the passage of most solutes and water inside the roots? Which pathway allows the entry of most of the water and some of the solutes inside the root tissue? Explain how the Casparian strip creates a barrier for substance moving through this pathway and how it is circumvented.arrow_forwardPlease answer the first questionarrow_forward
- Compare the leaf structure of Nerium to Ligustrum. Look for stomata. Where are they located? On the upper or lower leaf surface? How is the surface of the leaf modified? Can you recognize why these leaves are said to have “sunken stomata”? Look for “hairs” on the leaf surface. Where are they located? How are they advantageous? How does the appearance of each tissue layer in Nerium differ from Ligustrum? Compare the upper epidermis to the lower epidermis. Compare the amount of cuticle.arrow_forwardYou should have found more stomata on the lower portion of the eudicot leaf. What is the advantage of having more stomata on the lower portion of the leaf rather than on the upper portion? Was this true for the monocot leaf as well? What conclusions about stomata placement can you make from these observations? MacBook Pro Q Search or enter address # $ % & 2 3 4 W Earrow_forward. Compare the leaf structure of Potamogeton to Ligustrum. Look for stomata. Where are they located? On the upper or lower leaf surface? Does Potamogeton have sunken stomata or leaf hairs? Look at the area beneath the upper epidermis and compare it to the Ligustrum and Nerium leaves. How does it differ? What value does this have for the plant? How does the appearance of each tissue layer in Potamogeton differ from Ligustrum? Compare the upper epidermis to the lower epidermis. Compare the amount of cuticle. Compare the organization of the mesophyll cells to those in Ligustrum.arrow_forward
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