Chapter 15

Question 1

Innate behavior

Answer 1

An action or reaction that an animal is born with, such as reflexes and instincts

Question 2

Reflex

Answer 2

An immediate, involuntary response to a
change in the environment

Question 3

Instinct

Answer 3

A complex innate behavior

Question 4

Migration

Answer 4

The instinctive, long-distance, seasonal
movement of animals from one area to another

Question 5

Pheromone

Answer 5

A chemical released by animals that influences the behavior of other animals of the same species

Question 6

Learned behavior

Answer 6

An action or reaction that is learned by experience and is often motivated by reward or punishment

Question 7

Intelligent behavior

Answer 7

An action marked by thought,
analysis, communication, or the use of tools or symbols

Question 8

Egg

Answer 8

A female gamete; an embryo surrounded by a protective shell

Question 9

Sperm

Answer 9

A male gamete that is usually able to move by itself and is smaller than the female gamete of the same
species

Question 10

Ovary

Answer 10

in animals and humans, the female reproductive organ that produces eggs

Question 11

Testis

Answer 11

The male reproductive organs that produce sperm

Question 12

External fertilization

Answer 12

The union of a sperm and ovum
outside the parent organisms’ bodies

Question 13

Internal fertilization

Answer 13

The union of a sperm and ovum
within the female parent’s body

Question 14

Incubation

Answer 14

The maintaining of the conditions necessary to hatch an egg

Question 15

Embryo

Answer 15

in animals, the developmental stage of young before hatching or birth

Question 16

Uterus

Answer 16

A structure in which an embryo develops in the mother until it is born; the womb

Question 17

Gestation

Answer 17

The period when an organism is developing
inside the mother’s uterus; pregnancy