Ebright's vision in raising a flock of butterflies was to tag as many monarchs as possible to help study butterfly migrations. Since the butterfly collecting season around Reading lasted only six weeks, chasing butterflies one by one was inefficient. So he would catch a female monarch, take her eggs, and raise them in his basement through their complete life cycle — from egg to caterpillar to pupa to adult butterfly. He would then tag their wings and release them. For several years, his basement was home to thousands of monarchs at different stages of development.
Source: "The Making of a Scientist," Tagging Butterflies and Early Science Fairs
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The question asks specifically about Ebright's vision — i.e., his purpose and method. Examiners expect you to mention: (1) the reason — short season made individual catching inefficient, (2) the method — catch a female, raise eggs through life cycle in basement, (3) the goal — tag and release thousands of butterflies. Avoid adding unrelated details about him losing interest later. Stick to what the passage says about why and how he raised the flock.