Question 1

If plasmolyzed cells are placed in fresh water before permanent damage is done, they can become turgid once more.

Accepted Answer

A) True 
 B)False

Question 2

Changes in solute ion concentrations that are involved in the opening and closing of stomata pertain primarily to which of the following?

Accepted Answer

A)  cobalt 
B)  calcium 
C)  magnesium 
D)  potassium 
E)  iron 
A)  cobalt 
B)  calcium 
C)  magnesium 
D)  potassium 
E)  iron

Question 3

More than 90% of the water entering most plants passes on through the plant.

Accepted Answer

A) True 
 B)False

Question 4

All water that passes through a plant leaves the plant via stomata.

Accepted Answer

A) True 
 B)False

Question 5

Which is an essential trace element in plants?

Accepted Answer

A)  iron 
B)  phosphorus 
C)  copper 
D)  sulfur 
E)  nitrogen 
A)  iron 
B)  phosphorus 
C)  copper 
D)  sulfur 
E)  nitrogen

Question 6

Which of the following is NOT involved in guard cell regulation of stomata opening?

Accepted Answer

A)  photosynthesis 
B)  active transport 
C)  osmosis 
D)  imbibition 
E)  accumulation of potassium ions 
A)  photosynthesis 
B)  active transport 
C)  osmosis 
D)  imbibition 
E)  accumulation of potassium ions

Question 7

Pressure that develops within a living cell as a result of water entering the cell is called

Accepted Answer

A)  turgor. 
B)  osmosis. 
C)  plasmolysis. 
D)  transpiration. 
E)  water potential. 
A)  turgor. 
B)  osmosis. 
C)  plasmolysis. 
D)  transpiration. 
E)  water potential.

Question 8

Water potential is calculated by ________.

Accepted Answer

A)  subtracting turgor pressure from osmotic potential 
B)  calculating the rate of diffusion of water molecules in dry soil 
C)  combining osmotic potential and pressure potential of a plant cell 
D)  determining the rate of plasmolysis 
E)  None of these answers are correct. 
A)  subtracting turgor pressure from osmotic potential 
B)  calculating the rate of diffusion of water molecules in dry soil 
C)  combining osmotic potential and pressure potential of a plant cell 
D)  determining the rate of plasmolysis 
E)  None of these answers are correct.

Question 9

Active transport in plants apparently involves an enzyme complex that forms a/an ________.

Accepted Answer

A)  channel through the cell membrane 
B)  passive transport system 
C)  energy-free transport system 
D)  proton pump 
E)  sodium/potassium pump 
A)  channel through the cell membrane 
B)  passive transport system 
C)  energy-free transport system 
D)  proton pump 
E)  sodium/potassium pump

Question 10

Relatively uniform loss of color in leaves, occurring first on the older ones, is usually a sign of deficiency of which of the following?

Accepted Answer

A)  potassium 
B)  iron 
C)  nitrogen 
D)  magnesium 
E)  boron 
A)  potassium 
B)  iron 
C)  nitrogen 
D)  magnesium 
E)  boron

Question 11

The primary force that enables water to move to the top of very tall trees is root pressure.

Accepted Answer

A) True 
 B)False

Question 12

Liquid water is forced out of the leaf when leaf pores are closed at night in a process called

Accepted Answer

A)  transpiration. 
B)  translocation. 
C)  evaporation. 
D)  guttation. 
E)  diffusion. 
A)  transpiration. 
B)  translocation. 
C)  evaporation. 
D)  guttation. 
E)  diffusion.

Question 13

The movement of molecules from a region of high concentration to a region of low concentration is

Accepted Answer

A)  osmosis. 
B)  movement against the concentration gradient. 
C)  Brownian motion. 
D)  diffusion. 
E)  only common in gases such as oxygen. 
A)  osmosis. 
B)  movement against the concentration gradient. 
C)  Brownian motion. 
D)  diffusion. 
E)  only common in gases such as oxygen.

Question 14

A state of equilibrium is reached when molecules are evenly distributed in the space available to them.

Accepted Answer

A) True 
 B)False

Question 15

When humidity is high

Accepted Answer

A)  transpiration rates increase. 
B)  transpiration rates decrease. 
C)  transpiration ceases altogether. 
D)  leaves absorb moisture from the air. 
E)  stomata open wider. 
A)  transpiration rates increase. 
B)  transpiration rates decrease. 
C)  transpiration ceases altogether. 
D)  leaves absorb moisture from the air. 
E)  stomata open wider.

Question 16

Which of the following is NOT one of the nutrients that constitute about 99% of the nutrient total used by plants?

Accepted Answer

A)  nitrogen 
B)  potassium 
C)  phosphorus 
D)  sodium 
E)  calcium 
A)  nitrogen 
B)  potassium 
C)  phosphorus 
D)  sodium 
E)  calcium

Question 17

In which of the following situations will the rate of transpiration increase, assuming that no other variable changes?

Accepted Answer

A)  an increase in the relative humidity 
B)  the plant is under water stress 
C)  the sun has just gone below the horizon (dusk) 
D)  the stomata are recessed below the surface of the leaf (stomatal crypts) 
E)  the air temperature increases 
A)  an increase in the relative humidity 
B)  the plant is under water stress 
C)  the sun has just gone below the horizon (dusk) 
D)  the stomata are recessed below the surface of the leaf (stomatal crypts) 
E)  the air temperature increases

Question 18

Active transport is the reverse of transpiration.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is an essential micronutrient?

Accepted Answer

A)  magnesium 
B)  sulphur 
C)  calcium 
D)  phosphorus 
E)  manganese 
A)  magnesium 
B)  sulphur 
C)  calcium 
D)  phosphorus 
E)  manganese

Question 20

Imbibition is responsible for ________.

Accepted Answer

A)  plants wilting on sunny days 
B)  breaking open the seed coat of germinating seeds 
C)  osmosis 
D)  turgor pressure in cells 
E)  expansion of the vacuole inside the living cell 
A)  plants wilting on sunny days 
B)  breaking open the seed coat of germinating seeds 
C)  osmosis 
D)  turgor pressure in cells 
E)  expansion of the vacuole inside the living cell

Exam 9: Water in Plants

If plasmolyzed cells are placed in fresh water before permanent damage is done, they can become turgid once more.

Changes in solute ion concentrations that are involved in the opening and closing of stomata pertain primarily to which of the following?

More than 90% of the water entering most plants passes on through the plant.

All water that passes through a plant leaves the plant via stomata.

Which is an essential trace element in plants?

Which of the following is NOT involved in guard cell regulation of stomata opening?

Pressure that develops within a living cell as a result of water entering the cell is called

Water potential is calculated by ________.

Active transport in plants apparently involves an enzyme complex that forms a/an ________.

Relatively uniform loss of color in leaves, occurring first on the older ones, is usually a sign of deficiency of which of the following?

The primary force that enables water to move to the top of very tall trees is root pressure.

Liquid water is forced out of the leaf when leaf pores are closed at night in a process called

The movement of molecules from a region of high concentration to a region of low concentration is

A state of equilibrium is reached when molecules are evenly distributed in the space available to them.

When humidity is high

Which of the following is NOT one of the nutrients that constitute about 99% of the nutrient total used by plants?

In which of the following situations will the rate of transpiration increase, assuming that no other variable changes?

Active transport is the reverse of transpiration.

Which of the following is an essential micronutrient?

Imbibition is responsible for ________.

What Is Plant Biology

The Nature of Life

Cells

Tissues

Roots and Soils

Stems

Leaves

Flowers, Fruits, and Seeds

Plant Metabolism

Growth

Meiosis and Alternation of Generation

Genetics

Plant Breeding and Propagation

Evolution

Plant Names and Classification

Domain Kingdom Bacteria, Domain Kingdom Archaea, and Viruses

Kingdom Protista

Kingdom Fungi

Introduction to the Plant Kingdom: Bryophytes

The Seedless Vascular Plants - Ferns and Their Relatives

Introduction to Seed Plants: Gymnosperms

Seed Plants: Angiosperms

Flowering Plants and Civilization

Ecology

Biomes

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