BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 39, Problem 2U
Summary Introduction
Introduction:
The plants are divided into two regional parts based upon the appearance of the eyes of the humans. The upper part of the plant is called shoot and the lower part of the plant is called root.
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Which of the following statements about phototropism is/are not true?
A. Red light is the most effective light wavelength for positive phototropism of plants.
B. Higher auxin concentration on the lighted side causes that side to elongate more than the non illuminated side.
C. Phototropins are the only effective light receptors in phototropism.
D. Phototropism decreases the plant's ability to enhance photosynthetic capacity.
E. All of the above
F. None of the above
Discuss other morphological differences between sunny and shady set-ups of mung bean in relation to phototropic response of plants.
Characteristics
sunny
shaded
Leaf color
Lime Green
Pale Green
Direction of Growth
Grows upward towards the direction of sunlight
Oriented in the direction of the light but growth is bent downward
. Which of the following is not a typical plant response to oxygen deficit due to flooding? *
A. Aerenchyma formation
B. Hyponastic growth of submerged leaves
C. Stomatal closure
D. Induction of anaerobic stress proteins
Chapter 39 Solutions
BIOLOGY
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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- When considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE? Select one: a. Apoplastic phloem unloading enables the import of sugars against their concentration gradient into sink tissue. b. In apoplastic loading, the solute potential of the companion cells is more negative than the apoplastic space nearby. c. In apoplastic loading, proton pumps create electrochemical gradients that can be used by symporter proteins to import sugars into the companion cell. d. All the statements are true. e. Symplastic loading relies on diffusion of the sugars through plasmodesmata from photosynthetic cells to the phloem cells.arrow_forwardThigmotropism is a plant response toa. light. b. cold.c. touch. d. gravity. e. drought.arrow_forwardStomatal opening is induced by… Select one: a. high CO2 levels in the leaf. b. abscisic acid produced by mesophyll cells. c. proton pumps activated by green light. d. an increase in the water potential (becomes more positive) of guard cells. e. active transport of H+ ions out of the guard cell.arrow_forward
- Phytochrome is a plant pigment protein that: a. mediates plant infection b. promotes plant growth c. mediates morphological changes in response to red and far-red light d. inhibits plant growtharrow_forwardThe formation of an air bubble in the xylem is called a. agitation. b. cohesion. c. adhesion. d. cavitation.arrow_forwardWhich of the following plants requires light hours above than critical photoperiod for flowering? a.Henbane b.Tobacco c.Pepper d.Cucurbitarrow_forward
- Many different treatments were possible in the phototropism experiment. Based on your understanding of phototropism, provide predictions about the direction of plant growth for the following two scenarios, and explain your reasoning. 1. The tip of the coleoptile is removed and lanolin with auxin is applied to the dark side of the stem. 2. The tip of the coleoptile is removed and lanolin with auxin is applied to the light side of the stem.arrow_forwardPhotoperiodism, when a plant responds to: A. In order to flower, long day plants need: B. In order to flower, short day planys need:arrow_forwardPlant bends towards the source of light on account of the movement of curvature known as: A. geotropism B. thigmotropism C. chemotropism D. phototropismarrow_forward
- You were comparing two plants A and B. plant A has hyphal association in its roots and plant B lacks hyphal association in its roots. Which of the following is correct regarding the aforementioned scenario? Plant A grows faster than plant B because it has more roots than plant B O b. Both plants will have the same heights and number of leaves Plant A grows faster because it is exposed to more sunlight than plant B O d. Plant A grows faster than plant B because it gets more minerals from soll O e. Plant A grows faster than plant B because it gets more organic matter from soil A buffer solution comprises which of the following? O a Astrong acid in solution O b. Aweak acid and its conjugate base in solution OcAweak acid in solution O d Aweak base in solution: Astrong acid and its conjugate base in solutionarrow_forwardWhich of the following is/are false regarding the phloem? A. It transports starch from the leaves to the stem. B. It transports sucrose from the leaves to the roots. C. It is located lateral to the xylem in tree stems. D. Unlike the xylem, majority of the cells are living. E. A and D F. B and Carrow_forwardHeavy metal stress is associated with the following plant responses except: * A. Phytochelatin production for heavy metal chelation B. Catalase production for heavy metal chelation C. Heavy metal sequestration in the central vacuole D. No changes in plant response in the tolerance zonearrow_forward
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