Temperature and Life

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Questions and Answers

Which of the following best defines temperature?

A measure of the speed or intensity of the random motions of atoms and molecules in a substance (correct)
The limit on where organisms can live and function
The amount of energy in an object
The direction of heat transfer

What is the relationship between temperature and heat?

Temperature determines the direction of heat transfer (correct)
Temperature and heat are unrelated
Heat determines the direction of temperature change
Heat sets limits on where organisms can live and function

Which of the following is true about ectotherms?

They defend a constant body temperature
They generate internal (metabolic) heat
They rely mostly on external temperatures to determine body temperature (correct)
They have more than one temperature set point

What is the purpose of transpiration in plants?

To cool the plant (D) Signup and view all the answers

What is the relationship between endotherms and ectotherms?

Endotherms generate internal heat, while ectotherms rely mostly on external temperatures to determine body temperature (C) Signup and view all the answers

Which of the following is true about compensation in plants?

Compensation requires a shift away from the acute response. (C) Signup and view all the answers

What happens to the metabolic rate of plants without compensation?

The metabolic rate increases with increasing temperature. (A) Signup and view all the answers

What is the role of enzyme isoforms in compensation?

Enzyme isoforms allow for the fine-tuning of metabolism. (A) Signup and view all the answers

How does compensation work in terms of enzyme abundance?

Compensation involves increasing the amount of enzymes to compensate for reduced efficiency at lower temperatures. (C) Signup and view all the answers

What contributes to compensation in terms of enzyme activity?

Changes in enzyme microenvironment and viscosity. (D) Signup and view all the answers

Which equation represents the relationship between metabolic rate (M), temperature (T), and constants (a, b, and n) for an ectotherm?

$M=a10^{nT^b}$ (C) Signup and view all the answers

What is the temperature coefficient (Q10) defined as?

The ratio of the rate of a process at one temperature over the rate of the same process at a temperature 10°C lower (D) Signup and view all the answers