AP BIOLOGY

Detailed explanation-1: -Instinct is a type of animal behaviour that need not be learned. A spider does not learn how to spin its web. It is born with the knowledge of web spinning. So, it is an instinctual behaviour.

Detailed explanation-2: -The spinning of the web by spiders is considered an instinctive behaviour as it will spin the same web at any given time and environment without being trained for the shape of web.

Detailed explanation-3: -Web-building by spiders can be regarded as a pat tern that shows many characteristics of innate behavior. It is more standardized and easier to study than be havior patterns of higher animals and man, and it can be photographed.

Detailed explanation-4: -Using special organs called spinnerets, some spider species have evolved to produce many different kinds of silk. Each has its own use. Some are sticky, while others are strong or flexible. A single web may consist of several different kinds of silk, depending on what the spider will use it for.