Question 1

Sharks,rays,and skates retain urea and trimethylamine oxide (TMAO)within their blood allowing them to become only slightly hyperosmotic thereby reducing the cost of osmoregulation.

Accepted Answer

A) True 
 B)False

Question 2

The Namib Desert beetle,Onymacris unguicularis,obtains its water through positional maneuvers during foggy weather conditions.

Accepted Answer

A) True 
 B)False

Question 3

Bony marine fish

Accepted Answer

A)  drink sea water.
B)  secrete Na+ into the surrounding water.
C)  are hyperosmotic compared to the surrounding water.
D)  both drink sea water and secrete Na+ into the surrounding water.
E)  drink sea water,secrete Na+ into the surrounding water,and are hyperosmotic compared to the surrounding water. D

Question 4

A(n) ___________ marine fish gains water through osmosis and loses salts through diffusion.

Accepted Answer

A)  hyperosmotic
B)  hypoosmotic
C)  isoosmotic
D)  osmotic
E)  None of the choices are correct.

Question 5

Relative humidity = [ ___________________ / saturation water vapor density] x 100

Accepted Answer

The answer of Relative humidity = [ ___________________ / saturation...

Question 6

The evaporative water loss by an organism is high when the

Accepted Answer

A)  vapor pressure deficit is low.
B)  relative humidity is high.
C)  water concentration gradient from the organism to the air is reduced.
D)  actual water vapor density is very low relative to the saturation water vapor density.
E)  All of the choices are correct.

Question 7

Movement of water _____________ its concentration gradient is called ________________.

Accepted Answer

A)  down; diffusion
B)  up; diffusion
C)  down; active transport
D)  up; osmosis
E)  None of the choices are correct.

Question 8

Aquatic organisms whose ionic concentration of their body fluids is less than that of their surroundings are

Accepted Answer

A)  hyperosmotic.
B)  isoosmotic.
C)  hypoosmotic.
D)  osmotic.
E)  None of the choices are correct. C

Question 9

The potential for evaporative water loss by terrestrial organisms

Accepted Answer

A)  decreases with increased vapor pressure deficit.
B)  decreases with decreased vapor pressure deficit.
C)  increases with decreased vapor pressure deficit.
D)  increases with increased vapor pressure deficit.
E)  None of the choices are correct.

Question 10

A cicada will use which of the following mechanisms in order to survive hot,dry conditions of the desert?

Accepted Answer

A)  nocturnal behavior
B)  burrowing
C)  torpor
D)  sweating
E)  All of the choices are correct.

Question 11

In order to survive in the desert,a camel will employ which of the following mechanisms?

Accepted Answer

A)  face away from sun
B)  store water in its hump
C)  shed its fur
D)  allow its body temperature to rise
E)  All of the choices are correct.

Question 12

Aquatic organisms whose ionic concentration of their body fluids exceeds that of their surroundings are

Accepted Answer

A)  hyperosmotic.
B)  hypoosmotic.
C)  isoosmotic.
D)  osmotic.
E)  None of the choices are correct.

Question 13

Water conservation mechanisms used by plants adapted to dry conditions include

Accepted Answer

A)  dropping leaves.
B)  thick leaves.
C)  fewer stomata.
D)  dormancy.
E)  All of the choices are correct.

Question 14

All of the following contribute to the movement of water in a terrestrial plant except:

Accepted Answer

A)  transpiration.
B)  drying power of the sun.
C)  hydrogen bonding.
D)  water potential.
E)  None of the choices are correct.

Question 15

Which of the following may be used to study the uptake of water by plants in a natural ecosystem?

Accepted Answer

A)  non-stable isotope analysis
B)  radioactive isotope analysis
C)  14C isotope analysis
D)  stable isotope analysis
E)  water isotope analysis

Question 16

Windy days will decrease a plant's evaporative water loss.

Accepted Answer

A) True 
 B)False

Question 17

Water vapor is continuously added to the air by

Accepted Answer

A)  transpiration.
B)  evaporation.
C)  both transpiration and evaporation.
D)  precipitation.
E)  both evaporation and precipitation. C

Question 18

The camel and saguaro cactus both

Accepted Answer

A)  acquire massive amounts of water when water is available.
B)  allow their internal temperature to rise.
C)  reduce surface area exposed to direct sunlight.
D)  reflect sunlight with dense hairs.
E)  All of the choices are correct.

Question 19

Freshwater fish and freshwater mosquitoes must actively excrete ions such as Na+ and Cl-.

Accepted Answer

A) True 
 B)False

Question 20

In order to reduce heat gain,a camel will face into the sun.

Accepted Answer

A) True 
 B)False

Exam 6: Water Relations

Sharks,rays,and skates retain urea and trimethylamine oxide (TMAO)within their blood allowing them to become only slightly hyperosmotic thereby reducing the cost of osmoregulation.

Correct AnswerverifiedShow Answer

The Namib Desert beetle,Onymacris unguicularis,obtains its water through positional maneuvers during foggy weather conditions.

Correct AnswerverifiedShow Answer

Bony marine fish

Correct AnswerverifiedD

A(n) ___________ marine fish gains water through osmosis and loses salts through diffusion.

Correct AnswerverifiedShow Answer

Relative humidity = [ ___________________ / saturation water vapor density] x 100

Correct AnswerverifiedShow Answer

The evaporative water loss by an organism is high when the

Correct AnswerverifiedShow Answer

Movement of water _____________ its concentration gradient is called ________________.

Correct AnswerverifiedShow Answer

Aquatic organisms whose ionic concentration of their body fluids is less than that of their surroundings are

Correct AnswerverifiedC

The potential for evaporative water loss by terrestrial organisms

Correct AnswerverifiedShow Answer

A cicada will use which of the following mechanisms in order to survive hot,dry conditions of the desert?

Correct AnswerverifiedShow Answer

In order to survive in the desert,a camel will employ which of the following mechanisms?

Correct AnswerverifiedShow Answer

Aquatic organisms whose ionic concentration of their body fluids exceeds that of their surroundings are

Correct AnswerverifiedShow Answer

Water conservation mechanisms used by plants adapted to dry conditions include

Correct AnswerverifiedShow Answer

All of the following contribute to the movement of water in a terrestrial plant except:

Correct AnswerverifiedShow Answer

Which of the following may be used to study the uptake of water by plants in a natural ecosystem?

Correct AnswerverifiedShow Answer

Windy days will decrease a plant's evaporative water loss.

Correct AnswerverifiedShow Answer

Water vapor is continuously added to the air by

Correct AnswerverifiedC

The camel and saguaro cactus both

Correct AnswerverifiedShow Answer

Freshwater fish and freshwater mosquitoes must actively excrete ions such as Na+ and Cl-.

Correct AnswerverifiedShow Answer

In order to reduce heat gain,a camel will face into the sun.

Correct AnswerverifiedShow Answer

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D

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Movement of water _ its concentration gradient is called ____.

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C

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C

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Freshwater fish and freshwater mosquitoes must actively excrete ions such as Na⁺ and Cl^-.

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