Q92. The term innate behavior is a sort of animal behavior that is
(A) triggered by an environmental change
(B) learnt by hit–and–trial approach
(C) trained and taught by the parent
(D) fixed developmentally at the genetic level

Innate behavior refers to instinctive actions in animals that are genetically programmed and performed automatically without learning or experience. The correct answer to the multiple-choice question is (D) fixed developmentally at the genetic level, as this captures the core genetic and developmental basis of such behaviors.​

Option Analysis

• (A) triggered by an environmental change: Innate behaviors often respond to environmental stimuli, like a reflex to light or danger, but this describes a trigger rather than the defining origin.​

• (B) learnt by hit-and-trial approach: This defines trial-and-error learning, a form of acquired behavior, not innate ones which require no practice.​

• (C) trained and taught by the parent: Parental teaching leads to learned behaviors, whereas innate behaviors appear fully formed even in isolated animals.​

• (D) fixed developmentally at the genetic level: Innate behaviors are heritable, stereotypic, and hardwired in genes, expressed correctly from the first encounter with a stimulus.​

Innate behavior animals exhibit is a fundamental concept in ethology and behavioral biology, especially for CSIR NET Life Sciences aspirants studying instinctual responses versus learned actions. These innate behavior animals display are hardwired genetically, ensuring survival without prior experience.​

Characteristics of Innate Behavior

Innate behaviors are heritable, stereotypic, and inflexible, performed identically across a species. They develop fully at birth or early stages, independent of environment or practice. Examples include spider web-building or bird migration patterns.​

• Reflexes: Automatic responses like knee-jerk or pupillary light reflex.

• Taxes: Directed movements, e.g., phototaxis toward light.

• Kinesis: Undirected speed changes, like woodlice in dry areas.

• Fixed action patterns: Sequences like egg-retrieval in geese.​

Innate vs. Learned Behavior

This distinction is key for evolutionary biology and CSIR NET questions on animal adaptation.​