Question:

Passage:

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.


Question: What is the main theme of the passage?

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Notice that every example in the passage, the stick caterpillar, walking sticks, and butterflies, is about looking like something else to avoid predators.
Updated On: Jul 20, 2026
  • Life cycle of insects
  • The feeding habits of insects
  • Camouflage techniques in insects
  • Mode of survival in mammals
  • Tropical species of insects
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The Correct Option is C

Solution and Explanation

Step 1: The passage opens with the general idea that "to look 'uneatable' by resembling or imitating plants is a deceit widely practised by insects", which is a direct statement about camouflage as a survival strategy.

Step 2: The rest of the passage develops this single idea through two extended examples: the stick caterpillar, which freezes at an angle to look like a twig, and walking sticks/stick insects and butterflies, which naturally resemble twigs, thorny bushes or leaves.

Step 3: The passage never discusses the insects' life cycle (birth, growth, reproduction stages) or their feeding habits, so options (a) and (b) are incorrect. Mammals are mentioned only once, in passing, to say they rarely use camouflage, so option (d) is wrong. Tropical species are just one detail within the walking-sticks paragraph, not the overall theme, so option (e) is too narrow.

Step 4: Since every paragraph circles back to how insects disguise themselves to avoid being eaten, the main theme is camouflage techniques in insects.
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