The Caterpillar Jar: Inferring from Text, Not Pictures
During a whole-class read-aloud in a grade-2 classroom, the teacher reads this short passage: "Maya found a caterpillar on a milkweed leaf. She put it in a glass jar. With a nail, she carefully punched six holes in the metal lid. She set the jar on the windowsill." The teacher asks, "Why did Maya punch holes in the lid?" Ana says, "Because she wanted to decorate the lid." Ben says, "So the caterpillar can get air." Cara says, "Because the jar was too small." The teacher knows Ben often calls out answers that match the pictures but does not point to the words. The discussion must last four minutes, and the teacher wants every student to connect an answer to a word or phrase in the text.
1. Which student’s answer is best supported by the passage, and what exact words support it? Explain why the other two answers are weaker.
Read the worked answer
Ben’s answer is best supported. The passage says Maya put the caterpillar in a glass jar and punched six holes in the metal lid. A closed jar with a lid would trap air, so holes let air in. Ben’s answer connects those words to a purpose. Ana’s answer is weaker because "punched" describes making holes, not decorating; nothing in the text says Maya wanted the lid to look pretty. Cara’s answer is weaker because the passage does not say the jar was too small. She may be thinking about the caterpillar fitting inside, but the question asks why Maya made holes, and size does not explain holes. A strong grade-2 response names the holes or the lid, not just "because caterpillars need air" from general knowledge.
2. Ben’s answer is correct, but he guessed from the picture. Write one follow-up question that would require him to use the text, and explain what a strong response would include.
Read the worked answer
Ask: "What words in the story tell you the caterpillar needs air?" or "Why would a glass jar with a closed lid be a problem?" A strong response would point to "six holes in the metal lid" or explain that the lid would cover the jar and the holes let air in. The follow-up works because it does not ask Ben to repeat his answer; it asks him to locate evidence. If Ben says only "because it’s a caterpillar," the teacher should reread the sentence with him and ask him to touch the words "holes" and "lid." The judgment call is to praise the correct idea while requiring text support, so Ben learns that guessing from a picture is not the same as reading.
3. Cara says the jar was too small. What misunderstanding does this show, and what would you say next to use her idea productively?
Read the worked answer
Cara may be confusing the reason for the holes with the reason for choosing the jar. She might think the holes let the caterpillar out because the jar is cramped, or she may be focused on size rather than air. A productive next move is: "Let’s test that. If the jar were very big but had a closed lid, would the caterpillar be okay? Why or why not?" This keeps Cara’s idea in the discussion but redirects her to the lid and air. If she says the caterpillar would still need air, she is beginning to see that holes solve an air problem, not a size problem. The teacher should not simply say "No"; the goal is to make Cara compare her idea with the text.