Outside, the sun dipped lower. Leo picked up his pencil and turned to the next chapter.
He wrote that down. Then he looked at the root hair diagram again. “The soil has less… no, more minerals outside? Wait, the soil has lower concentration of nitrates than inside the root. So the plant has to pump them in against the gradient. That’s why it needs energy. That’s why it’s active.” exploring science 9 student book answers pdf
Leo had two problems. First, he didn’t know the answer. Second, he knew exactly where to look. Outside, the sun dipped lower
He remembered the last time. A few weeks ago, he’d found a PDF for an earlier unit—complete, every page, every “Check Your Understanding” question answered in neat, official-looking text. He’d copied three answers verbatim. His teacher, Ms. Kaur, had written in red ink across the top: “Great answers, Leo. But next time, use your own words. Come see me.” Then he looked at the root hair diagram again