Question:medium

Passage IV
Insects' lives are very diminutive and they have many enemies, but they must survive long enough to rear and perpetuate their kind. The less insect-like they look, the better their probability of survival. To look "uneatable" by resembling or imitating plants is a deceit widely practised by insects. Mammals hardly ever use this kind of camouflage, but many fish and invertebrates do.

The stick caterpillar is well named. It is hardly discernible from a brown or green twig. This caterpillar is quite familiar and can be found almost anywhere in North America. It is also called "measuring worm" or "inchworm." It walks by arching its body, then stretching out and grasping the branch with its front feet then looping its body again to bring the hind feet forward. When danger threatens, the stick caterpillar stretches its body away from the branch at an angle and remains rigid and still, like a twig, until the danger has passed.

Walking sticks, or stick insects, do not have to assume a rigid, twig-like pose to find protection; they look like inedible twigs in any position. There are many kinds of walking sticks, ranging in size from the few inches of the North American variety to some tropical species that may be over a foot long. When at rest their front legs are stretched out heightening their camouflage. Some of the tropical species are adorned with spines or ridges imitating the thorny bushes or trees in which they live. Leaves also seem to be a favorite object for insects to imitate. Many butterflies can suddenly disappear from view by folding their wings and sitting quietly among the foliage that they resemble.

Q. Which of the following is not true of insect camouflage techniques?

Show Hint

Check each option against the passage; the correct answer is the one idea that is never mentioned at all.
Updated On: Jul 20, 2026
  • Insects look like inedible twigs in any position
  • Insects stretch out at rest their front legs
  • Insects are adorned with spines or ridges imitating the thorny bushes
  • Insects change color to make them invisible
  • Insects fold their wings and sit quietly among the foliage
Show Solution

The Correct Option is D

Solution and Explanation

A quick way to crack "except/not true" questions is to build a short checklist of everything the passage actually claims, then match each option to that list.

From the passage, the confirmed camouflage facts are: (1) walking sticks look like twigs in any position, (2) their front legs stretch out at rest to enhance the disguise, (3) tropical walking sticks have spines or ridges that mimic thorny plants, (4) many butterflies fold their wings and sit still among leaves to vanish from sight, and (5) the stick caterpillar goes rigid like a twig when threatened.

Running through options (a), (b), (c) and (e), every one of them lines up exactly with one of these five confirmed facts. That leaves option (d), "insects change color to make them invisible." Color-changing camouflage (like a chameleon) is a completely different survival mechanism from what this passage describes, and the passage explicitly says such tricks are about shape and posture, not pigment. Since this claim has no support anywhere in the text, it is the one that is not true. Final answer: (d) Insects change color to make them invisible
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