Exam 35: Water and Sugar Transport in Plants

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The research by Natalie De Witt and Michael Sussman showed that proton pump AHA3 is localized in the membrane of companion cells of the source tissue. What is the function of this pump?

(Multiple Choice)

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Question 21

Water potential in plants consists mainly of

(Multiple Choice)

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Question 22

J. A. Milburn and R. P. C. Johnson developed an acoustic method for detecting cavitation formation of air bubbles) in plants. This involves "listening" for characteristic clicks produced during air- bubble formation, using sensitive microphones and amplifiers. In one experiment with the castor bean plant Ricinus communis), they detached leaves by cutting the petioles and subjected them to various treatments. Which of the following would be least likely to be observed in such an experiment?

(Multiple Choice)

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Question 23

How does a flaccid cell differ from a turgid cell?

(Multiple Choice)

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Question 24

Which of the following statements about phloem unloading at sinks is not consistent with our current understanding?

(Multiple Choice)

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Question 25

Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?

(Multiple Choice)

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Question 26

Which theory of water transport in xylem can also be used to explain the movement of water in nonvascular plants such as mosses?

(Multiple Choice)

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Question 27

If you cut a stalk petiole) of celery and place it in a beaker of water that has food colouring dissolved in it, coloured water will move up the stalk and into the leaf blades. This provides evidence against which of the following theories of xylem transport?

(Multiple Choice)

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Question 28

Root pressure can result in the early morning appearance of water droplets on leaves and flowers of low- growing plants. Which of the following does not contribute to the development of root pressure?

(Multiple Choice)

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Question 29

Which of the following structural features of plants would not be expected to reduce transpiration?

(Multiple Choice)

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Question 30

Cell- to- cell water movement always occurs from

(Multiple Choice)

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Question 31

Which of the following adaptations are least likely to be found in plants that regularly experience dry, hot conditions?

(Multiple Choice)

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Question 32

As an undergraduate research assistant, you are assisting with a radioisotope tracer experiment. You expose a mature leaf on one side of the lower shoot of a sugar beet plant to ¹⁴CO₂and then track the movement of the¹⁴C atoms by radiography. Where are you least likely to detect ¹⁴C?

(Multiple Choice)

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Question 33

Loss of water from the aerial parts of plants is called

(Multiple Choice)

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Question 34

Which of the following cross- membrane transport mechanisms occur without expenditure of energy?

(Multiple Choice)

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Question 35

CAM plants perform photosynthesis during the day even though their stomata are closed. How do these plants obtain carbon dioxide in order to carry out photosynthesis?

(Multiple Choice)

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Question 36

The processes of water flow in xylem and sugar translocation in phloem differ in many respects. Which of the following is not a difference between xylem and phloem transport?

(Multiple Choice)

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Question 37

What drives the flow of water through the xylem?

(Multiple Choice)

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Question 38

In which plant cell or tissue would the pressure component of water potential most often be negative?

(Multiple Choice)

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Question 39

Which of the following cross- membrane transport mechanisms requires the expenditure of energy?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 42

Exam 35: Water and Sugar Transport in Plants

The research by Natalie De Witt and Michael Sussman showed that proton pump AHA3 is localized in the membrane of companion cells of the source tissue. What is the function of this pump?

Water potential in plants consists mainly of

How does a flaccid cell differ from a turgid cell?

Which of the following statements about phloem unloading at sinks is not consistent with our current understanding?

Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?

Which theory of water transport in xylem can also be used to explain the movement of water in nonvascular plants such as mosses?

If you cut a stalk petiole) of celery and place it in a beaker of water that has food colouring dissolved in it, coloured water will move up the stalk and into the leaf blades. This provides evidence against which of the following theories of xylem transport?

Root pressure can result in the early morning appearance of water droplets on leaves and flowers of low- growing plants. Which of the following does not contribute to the development of root pressure?

Which of the following structural features of plants would not be expected to reduce transpiration?

Cell- to- cell water movement always occurs from

Which of the following adaptations are least likely to be found in plants that regularly experience dry, hot conditions?

As an undergraduate research assistant, you are assisting with a radioisotope tracer experiment. You expose a mature leaf on one side of the lower shoot of a sugar beet plant to 14CO2 and then track the movement of the 14C atoms by radiography. Where are you least likely to detect 14C?

Loss of water from the aerial parts of plants is called

Which of the following cross- membrane transport mechanisms occur without expenditure of energy?

CAM plants perform photosynthesis during the day even though their stomata are closed. How do these plants obtain carbon dioxide in order to carry out photosynthesis?

The processes of water flow in xylem and sugar translocation in phloem differ in many respects. Which of the following is not a difference between xylem and phloem transport?

What drives the flow of water through the xylem?

In which plant cell or tissue would the pressure component of water potential most often be negative?

Which of the following cross- membrane transport mechanisms requires the expenditure of energy?

Biology and the Tree of Life

Water and Carbon: the Chemical Basis of Life

Protein Structure and Function

Nucleic Acids and the Rna World

An Introduction to Carbohydrates

Lipids, Membranes, and the First Cells

Inside the Cell

Energy and Enzymes

Cellular Respiration and Fermentation

Photosynthesis

Cellcell Interactions

The Cell Cycle

Meiosis

Mendel and the Gene

Dna and the Gene: Synthesis and Repair

How Genes Work

Transcription, Rna Processing, and Translation

Control of Gene Expression in Bacteria

Control of Gene Expression in Eukaryotes

The Molecular Revolution: Biotechnology and Beyond

Gene Structure and Development

Evolution by Natural Selection

Evolutionary Processes

Speciation

Phylogenies and the History of Life

Bacteria and Archaea

Protists

Green Algae and Land Plants

Fungi

An Introduction to Animals

Protostome Animals

Deuterostome Animals

Viruses

Plant Form and Function

Plant Nutrition

Plant Sensory Systems, Signals, and Responses

Plant Reproduction and Development

Animal Form and Function

Water and Electrolyte Balance in Animals

Animal Nutrition

Gas Exchange and Circulation

Animal Nervous Systems

Animal Sensory Systems

Animal Movement

Chemical Signals in Animals

Animal Reproduction and Development

The Immune System in Animals

An Introduction to Ecology

Behavioural Ecology

Population Ecology

Community Ecology

Ecosystems and Global Ecology

Biodiversity and Conservation Biology

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As an undergraduate research assistant, you are assisting with a radioisotope tracer experiment. You expose a mature leaf on one side of the lower shoot of a sugar beet plant to ¹⁴CO₂and then track the movement of the¹⁴C atoms by radiography. Where are you least likely to detect ¹⁴C?