Chapter 6 Water Relations

Question 1

An increase in the vapor pressure deficit in the air around an organism would result in _______ in the rate of evaporation from the organism.

Answer 1

an increase

Question 2

In response to decreasing the humidity of the experimental chambers, Toolson and Hadley found that the internal temperature of cicadas rapidly ______ the True or false: Studies of Piper auritum showed strategies for water conservation are limited to plants growing in arid environments.

True false question.
True
False

temperature.

Answer 2

decreased below

Question 3

In response to daily drying conditions, Chiariello found that the tropical plant Piper auritum ______ in order to reduce evaporative water losses.

Answer 3

reduced leaf area

Question 4

Schenk and Jackson found that, in general, root lengths ______ when moving from 80° to 30° latitude.

Answer 4

increase

Question 5

Animals predominantly eating C4 plants would have a, ______ ratio of 12C: 13C than those eating C3 plants.

Answer 5

lesser

Question 6

Water flows from organisms to the atmosphere at a rate influenced by the ______ of the air surrounding the organism.

Answer 6

vapor pressure deficit

Question 7

For an animal, an increase in We would need to be offset by an increase in which one of the following in order to keep Wia constant?

Answer 7

Wd (water taken by drinking)

Question 8

Which of the following are strategies used by plants to conserve water in arid environments?

Answer 8

dormancy

thicker leaves

reduced leaf area

Question 9

Which of the following are ways that scorpions conserve water?

Answer 9

reducing their metabolic rate

burrowing into moist soil

Question 10

In response to increasing the humidity of the experimental chambers, Toolson and Hadley found that the internal temperature of cicadas ______ the ambient temperature.

Answer 10

increased to

Question 11

True or false: Studies of Piper auritum showed strategies for water conservation are limited to plants growing in arid environments.

Answer 11

false

plants can be under water at any second

Question 12

In order to determine the source of water for plants in Utah, Ehleringer compared the δD for xylem fluid to ______.

Answer 12

summer and winter precipitation

Question 13

14N is differentially excreted during protein synthesis compared to 15N. We would therefore expect the ratio of 14N:15N to ______ when moving up a food web.

Answer 13

decrease

Question 14

The presence of what helps to improve the waterproofing of the cuticle of scorpions?

Answer 14

hydrocarbons

Question 15

A plant is placed in a clear, sealed chamber. Over time you would expect the amount of water vapor in the chamber to ______.

Answer 15

increase

Question 16

The saturation water vapor pressure ______ when air temperature increases.

Answer 16

increases

Question 17

In response to decreasing the humidity of the experimental chambers, Toolson and Hadley found that the internal temperature of cicadas rapidly ______ the ambient temperature.

Answer 17

decreased below

Question 18

The pressure exerted by

- water vapor when the air is saturated is ______ pressure.

Answer 18

saturation where the water proofing works

Question 19

True or false: Studies of Piper auritum showed strategies for water conservation are limited to plants growing in arid environments.

Answer 19

false

Plants can be under water stress in any environment.

Question 20

14N is differentially excreted during protein synthesis compared to 15N. We would therefore expect the ratio of 14N:15N to ______ when moving up a food web.

Answer 20

decrease

Question 21

The saturation water vapor pressure ______ when air temperature increases.

Answer 21

increases