According to the passage, nuclear polyhedrosis viruses can remain virulent in the environment only when ______________

The polyhedrin protein crystals dissolve.

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Caterpillar populations are in decline.

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They are present in large numbers.

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Their concentration in a particular area remains low.

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They are sheltered from direct sunlight.

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Solution

The correct option is E They are sheltered from direct sunlight.
Option E is the right answer beacuse it is clearly mentioned in the passage that - 'Nuclear polyhedrosis viruses are hypothesized to be the driving force behind population cycles in Lepidoptera in part because the viruses themselves follow an infectious cycle in which, if protected from direct sunlight, they may remain virulent for many years in the environment, embedded in durable crystals of polyhedrin protein.'
There is no evidence in the passage to suggest that Options A, B, C, and D are the right answers.
Hence, these are incorrect.

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