How is C4 photosynthesis able to achieve higher concentrations of CO2 in the vicinity of rubisco than photosynthesis in C3 plants can?

A) by separating carbon capture from carbon fixation B) by suppressing photorespiration C) by capturing HCO3- instead of CO2 D) because the C4 cycle is faster than the Calvin cycle A) by separating carbon capture from carbon fixation B) by suppressing photorespiration C) by capturing HCO3- instead of CO2 D) because the C4 cycle is faster than the Calvin cycle

Recall that C4 plants tend to have higher rates of photosynthesis when compared with C3 plants (under normal 21% O2 atmospheric conditions). If photosynthetic rates are higher, why aren't all plants C4 plants?

A) Because of the need to regenerate PEP, C4 photosynthesis consumes more energy than C3 photosynthesis. B) Because of rubisco, C4 photosynthesis consumes more O2 than C3 photosynthesis. C) Because of mesophyll cells, C4 photosynthesis requires more chlorophyll than C3 photosynthesis. D) Because of leaf veins, C4 photosynthesis requires more H2O than C3 photosynthesis. A) Because of the need to regenerate PEP, C4 photosynthesis consumes more energy than C3 photosynthesis. B) Because of rubisco, C4 photosynthesis consumes more O2 than C3 photosynthesis. C) Because of mesophyll cells, C4 photosynthesis requires more chlorophyll than C3 photosynthesis. D) Because of leaf veins, C4 photosynthesis requires more H2O than C3 photosynthesis.

Plants lose several hundred H2O molecules for each CO2 that is fixed by photosynthesis because:

A) the concentration gradient is many times larger for H2O than for CO2. B) H2O molecules are lighter than CO2 molecules and thus diffuse faster. C) H2O molecules are consumed during photosynthesis. D) the evaporation of so many H2O molecules is necessary to keep photosynthesis at its optimum temperature. A) the concentration gradient is many times larger for H2O than for CO2. B) H2O molecules are lighter than CO2 molecules and thus diffuse faster. C) H2O molecules are consumed during photosynthesis. D) the evaporation of so many H2O molecules is necessary to keep photosynthesis at its optimum temperature.

During both CAM and C4 photosynthesis, what is the role of the PEP carboxylase enzyme?

A) to create ATP B) to capture CO2 in the form of HCO3 C) to capture CO2 in the form of 3-carbon organic acids D) to capture CO2 in the form of 4-carbon organic acids A) to create ATP B) to capture CO2 in the form of HCO3 C) to capture CO2 in the form of 3-carbon organic acids D) to capture CO2 in the form of 4-carbon organic acids

Exam 29: Plant Structure and Function: Moving Photosynthesis Onto Land

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Which of the following plants would likely be the FIRST to colonize a newly formed volcanic island (an environment of bare rock with no developed soil)?

(Multiple Choice)

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Question 121

_____ are symbioses between roots and fungi that enhance nutrient uptake by plant roots.

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Question 122

Referring to Figure 29.1, which of the following are NOT a monophyletic group?

(Multiple Choice)

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Question 123

In which direction would phloem sap flow if there were a greater concentration of sucrose molecules in the root phloem compared with the leaf phloem?

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Question 124

Applying fungicides to plants may result in a phosphorus deficiency. What is the MOST likely explanation for this observation?

(Multiple Choice)

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Question 125

How is C₄ photosynthesis able to achieve higher concentrations of CO₂ in the vicinity of rubisco than photosynthesis in C₃ plants can?

(Multiple Choice)

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Question 126

If a phylogenetic group is composed of all the descendants of a single ancestor, then that group would be considered paraphyletic.

(True/False)

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Question 127

A rosebush needs to increase the concentration of phosphorus in the water within its xylem. Assuming there are sources of phosphorus in the soil, which of the following actions of the plant could lead to physiologically important increases in phosphorus uptake?

(Multiple Choice)

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Question 128

We typically think of phloem as transporting carbohydrates throughout vascular plants. What other substances can travel through the phloem?

(Multiple Choice)

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Question 129

Recall that C₄plants tend to have higher rates of photosynthesis when compared with C₃ plants (under normal 21% O₂ atmospheric conditions). If photosynthetic rates are higher, why aren't all plants C₄ plants?

(Multiple Choice)

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Question 130

Which of the following are produced by roots in order to increase surface area, allowing greater access to nutrients in the soil?

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Question 131

Some angiosperms produce "cluster roots," which are roots that have high metabolic rates and exude large quantities of organic acids into the soil. For the plant, what do you expect is the most useful benefit of these organic acids?

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Question 132

Which of the following statements is FALSE about root hairs?

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Question 133

Plants exert greater forces to draw water up through the xylem than is possible with a vacuum pump.

(True/False)

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Question 134

A scientist wants to stop all vascular plants from photosynthesizing. He decides to send his students out to cut off the structures in plants where most photosynthesis takes place. Which structures should his students remove?

(Multiple Choice)

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Question 135

The status of a tissue as source or sink may change depending on the growth and development of that tissue as well as tissues located elsewhere in the plant.

(True/False)

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Question 136

Water is transported from the soil to the leaves in the:

(Multiple Choice)

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Question 137

Plants lose several hundred H₂O molecules for each CO₂ that is fixed by photosynthesis because:

(Multiple Choice)

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Question 138

During both CAM and C₄ photosynthesis, what is the role of the PEP carboxylase enzyme?

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Question 139

A companion cell supports a sieve element by performing specific cellular processes.

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Question 140

Showing 121 - 140 of 179

Exam 29: Plant Structure and Function: Moving Photosynthesis Onto Land

Which of the following plants would likely be the FIRST to colonize a newly formed volcanic island (an environment of bare rock with no developed soil)?

_____ are symbioses between roots and fungi that enhance nutrient uptake by plant roots.

Referring to Figure 29.1, which of the following are NOT a monophyletic group?

In which direction would phloem sap flow if there were a greater concentration of sucrose molecules in the root phloem compared with the leaf phloem?

Applying fungicides to plants may result in a phosphorus deficiency. What is the MOST likely explanation for this observation?

How is C4 photosynthesis able to achieve higher concentrations of CO2 in the vicinity of rubisco than photosynthesis in C3 plants can?

If a phylogenetic group is composed of all the descendants of a single ancestor, then that group would be considered paraphyletic.

A rosebush needs to increase the concentration of phosphorus in the water within its xylem. Assuming there are sources of phosphorus in the soil, which of the following actions of the plant could lead to physiologically important increases in phosphorus uptake?

We typically think of phloem as transporting carbohydrates throughout vascular plants. What other substances can travel through the phloem?

Recall that C4 plants tend to have higher rates of photosynthesis when compared with C3 plants (under normal 21% O2 atmospheric conditions). If photosynthetic rates are higher, why aren't all plants C4 plants?

Which of the following are produced by roots in order to increase surface area, allowing greater access to nutrients in the soil?

Some angiosperms produce "cluster roots," which are roots that have high metabolic rates and exude large quantities of organic acids into the soil. For the plant, what do you expect is the most useful benefit of these organic acids?

Which of the following statements is FALSE about root hairs?

Plants exert greater forces to draw water up through the xylem than is possible with a vacuum pump.

A scientist wants to stop all vascular plants from photosynthesizing. He decides to send his students out to cut off the structures in plants where most photosynthesis takes place. Which structures should his students remove?

The status of a tissue as source or sink may change depending on the growth and development of that tissue as well as tissues located elsewhere in the plant.

Water is transported from the soil to the leaves in the:

Plants lose several hundred H2O molecules for each CO2 that is fixed by photosynthesis because:

During both CAM and C4 photosynthesis, what is the role of the PEP carboxylase enzyme?

A companion cell supports a sieve element by performing specific cellular processes.

Life: Chemical, Cellular, and Evolutionary Foundations

The Molecules of Life

Nucleic Acids and Transcription

Translation and Protein Structure

Organizing Principles: Lipids, Membranes, and Cell Compartments

Making Life Work: Capturing and Using Energy

Cellular Respiration: Harvesting Energy From Carbohydrates and Other Fuel Molecules

Photosynthesis: Using Sunlight to Build Carbohydrates

Cell Signaling

Cell and Tissue Architecture: Cytoskeleton, Cell Junctions, and Extracellular Matrix

Cell Division: Variations, Regulation, and Cancer

Dna Replication and Manipulation

Genomes

Mutation and Dna Repair

Genetic Variation

Mendelian Inheritance

Inheritance of Sex Chromosomes, Linked Genes, and Organelles

The Genetic and Environmental Basis of Complex Traits

Genetic and Epigenetic Regulation

Genes and Development

Evolution: How Genotypes and Phenotypes Change Over Time

Species and Speciation

Evolutionary Patterns: Phylogeny and Fossils

Human Origins and Evolution

Cycling Carbon

Bacteria and Archaea

Eukaryotic Cells: Origins and Diversity

Being Multicellular

Plant Reproduction: Finding Mates and Dispersing Young

Plant Growth and Development

Plant Defense: Keeping the World Green

Plant Diversity

Fungi: Structure, Function, and Diversity

Animal Nervous Systems

Animal Sensory Systems and Brain Function

Animal Movement: Muscles and Skeletons

Animal Endocrine Systems

Animal Cardiovascular and Respiratory Systems

Animal Metabolism, Nutrition, and Digestion

Animal Renal Systems: Water and Waste

Animal Reproduction and Development

Animal Immune Systems

Animal Diversity

Animal Behavior

Population Ecology

Species Interactions, Communities, and Ecosystems

Biomes and Global Ecology

The Anthropocene: Humans As a Planetary Force

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How is C₄ photosynthesis able to achieve higher concentrations of CO₂ in the vicinity of rubisco than photosynthesis in C₃ plants can?

Recall that C₄plants tend to have higher rates of photosynthesis when compared with C₃ plants (under normal 21% O₂ atmospheric conditions). If photosynthetic rates are higher, why aren't all plants C₄ plants?

Plants lose several hundred H₂O molecules for each CO₂ that is fixed by photosynthesis because:

During both CAM and C₄ photosynthesis, what is the role of the PEP carboxylase enzyme?