Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Chapter 23, Problem 4MCQ
Summary Introduction
Introduction:
Phloem tissue which is made up of sieve tubes and companion cells, is responsible for the transports of sugars to the whole plant parts. The part which produces or synthesizes sugar is called source and the parts that receives sugars from the source are known as sink. The source of sugar synthesis is leaf of a plant and sink are usually non photosynthetic parts of plants that are not able to make sugars like, fruits, flowers, shoot meristems, roots and other storage organs.
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What process creates the pressure that drives phloem toward sinks?a. Osmosis into the sieve tubes at sourcesb. Active transport of water into companion cellsc. Osmosis out of sieve tubes at sinksd. Both a and c are correct
What would be the consequence of removing the Casparian strip?
a. Water and mineral nutrients would not be able to reach the xylem.
b. There would be less selectivity as to what passed into the xylem.
c. Water and mineral nutrients would be lost from the xylem back into the soil.
d. Water and mineral nutrients would no longer be able to pass through the cell walls of the endodermis.
Choose the possible places a water molecule can go once it has traveled from the roots to a leaf cell.
A. Return to the soil
B. Release to the atmosphere
C. Store in central vacuole
D. Mitochondria
Chapter 23 Solutions
Biology: Concepts and Investigations
Ch. 23.1 - How do plants acquire C, H, O, N, and P?Ch. 23.1 - Prob. 2MCCh. 23.1 - Prob. 3MCCh. 23.2 - Prob. 1MCCh. 23.2 - Prob. 2MCCh. 23.2 - Prob. 3MCCh. 23.3 - Prob. 1MCCh. 23.3 - Prob. 2MCCh. 23.3 - Prob. 3MCCh. 23.4 - Prob. 1MC
Ch. 23.4 - Prob. 2MCCh. 23.5 - Prob. 1MCCh. 23.5 - Prob. 2MCCh. 23.5 - Prob. 3MCCh. 23 - Prob. 1MCQCh. 23 - Prob. 2MCQCh. 23 - Prob. 3MCQCh. 23 - Prob. 4MCQCh. 23 - Prob. 5MCQCh. 23 - Prob. 6MCQCh. 23 - Prob. 7MCQCh. 23 - Explain the relationship between transpiration and...Ch. 23 - Prob. 2WIOCh. 23 - Prob. 3WIOCh. 23 - Prob. 4WIOCh. 23 - Prob. 5WIOCh. 23 - Prob. 6WIOCh. 23 - Prob. 7WIOCh. 23 - Prob. 8WIOCh. 23 - Prob. 9WIOCh. 23 - Prob. 10WIOCh. 23 - Prob. 11WIOCh. 23 - Prob. 12WIOCh. 23 - Prob. 13WIOCh. 23 - Prob. 1PITCh. 23 - Prob. 2PITCh. 23 - Prob. 3PIT
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- Which structure is involved in the transport of gibberlins through out the plant? A. Cork cambium B. Guard cells C. Vascular tissue D. Apical meristemarrow_forwardWhich cells are responsible for the movement of photosynthates through a plant? a. tracheids, vessel elements b. tracheids, companion cells c. vessel elements, companion cells d. sieve-tube elements, companion cellsarrow_forwardApproximately 10 percent of water within the atmosphere has been released by plants by transpiration. Which is the best method for measuring the transpiration rate within an individual plant? A. Measure osmotic pressure within the guard cells to determine amount of time stomata are open. B. Weigh the plant before and after a 24 hour period while accounting for evaporation from the soil. C. Access the abiotic conditions and how the plant has adapted to its native environment. D. Measure water loss by placing a plastic bag over a stem of the plant and subtracting the amount of water released into the bag from the amount of water within the soil.arrow_forward
- What fraction of the soil represents the most active? A. Clay B. Pore spaces C. Humus D. Soil colloidsarrow_forwardWhat is the function of xylem vessels? A. composed of dead lignified cells connected end to end B. allows the transport of water and minerals in the upward direction C. carries the products of photosynthesis in a bidirectional movement D. composed of sieve tubes that are closely associated with companion cells to facilitate movement of materialsarrow_forwardWhat substances plug wounded sieve-tube elements, thereby preventingthe leakage of phloem sap?a. X protein and callose b. C protein and callose c. P protein and callose d. P protein and sucrose e. none of the abovearrow_forward
- Which of the following cell types remain alive in matureplant tissue?a. sclerenchyma c. tracheidsb. sieve elements d. vessel elementsarrow_forwardWhat is the conclusion of the Experiment on Absoprtion of Water by Roots? A. Cup 1 - with half water and the lid is tightly close to ensure the evaporation of water. B. Cup 2 - with half water and few drops of oil while the plant sample's roots are immersed. C. Cup 3 - with half water and drops of ink while another plant sample's roots are immersed. D. Cup 4 - with plant sample but the roots do not reach the water.arrow_forwardThe process of bulk flow transports fluids in a plant. What are the two main bulk flow processes? * A. Movement of water up the xylem and movement of solutes up and down the phloem B. Movement of water up the phloem and movement of solutes up and down the xylem C. Movement of water up and down the xylem and movement of solutes up the phloem D. Movement of solutes up the xylem and movement of water up and down the phloem E. Movement of solutes down the phloem and movement of water up and down the xylem F. Movement of solutes down the phloem and movement of water up the xylemarrow_forward
- Water transport from roots to leaves occurs by a. evaporation, tension, and cohesion b. a pressure gradient inside sieve tubes c. the pumping force of xylem vessels d. different solutes at source and sink regionsarrow_forwardWhich of the following plant structures is necessary for transpiration to occur? a. Sieve tubes c. Fruits b. Leaves d. Rootsarrow_forwardGuard cells surround stomata on the surface of leaves. A new herbicide targets the function of guard cells and prevents them from becoming flaccid and closing the stomata. What effect would the herbicide have on plants? a.Plants would dry out because guard cells protect the epidermis against desiccation. b.Plants would be eaten because guard cells protect leaves against herbivores. c. Plants would dry out because stomata would not be able to close. d.lt would regulate the intake of minerals in the plants.arrow_forward
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