(A) that is triggered by an environmental change

(B) that is taught by the parent

(C) that is developmentally fixed

(D) that an organism learns on its own by “a hit-and trial” approach

Innate behavior refers to animal behavior that is developmentally fixed. These genetically programmed responses appear fully formed without learning or experience, distinguishing them from acquired behaviors.

Options Explained

Triggered by Environmental Change (A)

Both innate and learned behaviors respond to environmental stimuli. Innate behaviors like fixed action patterns require specific sign stimuli (e.g., red spot on robin beak), but this trait doesn’t uniquely define innateness.​

Taught by Parent (B)

Parental teaching exemplifies learned behavior through social transmission or imprinting modification. Innate behaviors manifest even in isolation without parental contact.​

Developmentally Fixed (C)

Correct definition: Innate behaviors are heritable, stereotypic, inflexible, and fully expressed at first performance—independent of developmental experience or practice. Examples: spider web-building, bird song (unlearned species).

Learns by Hit-and-Trial (D)

Trial-and-error learning produces learned behavior through reinforcement/association. Innate behaviors bypass this entirely, performing correctly on first exposure.​

Innate behavior developmentally fixed distinguishes instinctive responses from learned adaptations, essential for NEET animal physiology mastery.​

Innate vs Learned Behavior Comparison

Key Innate Behavior Properties

• Heritable: DNA-encoded ethogram

• Intrinsic: Isolation-reared animals perform

• Stereotypic: Identical performance every time

• Inflexible: No developmental modification​​

Why Option (C) is Correct

Standard behavioral biology defines innate behaviors by developmental fixity—isolation studies confirm spiderlings weave perfect webs without maternal instruction.