Salmon Eggs Hatch in Freshwater

question 25

Multiple Choice

Salmon eggs hatch in freshwater. The fish then migrate to the ocean (a hypertonic solution) and, after several years of feeding and growing, return to freshwater to breed. How can these organisms make the transition from freshwater to ocean water and back to freshwater?

• A) The rectal gland functions in the ocean water, and chloride cells function in freshwater.
• B) Different gill cells are involved in osmoregulation in freshwater than in salt water.
• C) Salmon in freshwater excrete dilute urine, and salmon in salt water secrete concentrated urine.
• D) Their metabolism changes in salt water to degrade electrolytes.

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Definitions:

Negative Reinforcement

A behavior reinforcement strategy that involves the removal of an unpleasant stimulus in response to a desired behavior.

Albert Bandura

A psychologist known for his social learning theory and the concept of self-efficacy.

Cognitive Explanation

An understanding or interpretation focusing on mental processes such as perception, memory, and reasoning.

UCS

An abbreviation for Unconditioned Stimulus, a stimulus that naturally and automatically triggers a response without prior conditioning.