Question:easy

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. How does the stick caterpillar make itself look like a twig?

Show Hint

Look at the sentence describing what the caterpillar does "when danger threatens."
Updated On: Jul 20, 2026
  • By looping itself around a stick
  • By holding its body stiff and motionless
  • By changing the color of its skin
  • By laying its body flat against a branch
  • By burrowing inside a twig
Show Solution

The Correct Option is B

Solution and Explanation

This is a factual, detail-based RC question, so the fastest way to solve it is to locate the exact word in the question ($stick\ caterpillar$) inside the passage and read the sentence around it carefully.

The passage tells us the stick caterpillar "walks by arching its body... looping its body again to bring the hind feet forward" - that describes its normal walking motion, not its camouflage trick, so option (a) is a distractor built from this walking description.

The actual camouflage behaviour appears in the very next line: "When danger threatens, the stick caterpillar stretches its body away from the branch at an angle and remains rigid and still, like a twig." The two operative actions here are stretching away at an angle, and remaining rigid and still. Among the five choices, "holding its body stiff and motionless" is the only one that captures this rigid, unmoving posture.

None of the other options (color change, lying flat, burrowing) appear anywhere in the text, so they can be eliminated purely on the basis of not being mentioned. Final answer: (b) By holding its body stiff and motionless
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