In a Radial-Arm Maze,rats Typically

question 9

Multiple Choice

In a radial-arm maze,rats typically

• A)move from one arm to the next in an orderly sequence
• B)have no clear order to their choices of arms,yet seldom revisit the same arm twice
• C)have no clear order to their choices of arms,and make many repeat visits to the same arms
• D)tend to return to the arms where they first received food

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Definitions:

Fluid

In a physical context, a substance that has no fixed shape and yields easily to external pressure; in a cognitive context, it refers to the capacity to think abstractly and reason adaptively.

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, giving rise to the nervous system and the epidermis, among other structures.

Mesoderm

The middle layer of an embryo in early development, giving rise to the musculoskeletal, vascular, and urogenital systems.

Trophoblast

The outer layer of cells surrounding a blastocyst in early pregnancy, which provides nutrients to the embryo and develops into part of the placenta.