Question Detail
Question
What material was used by Boysen-Jensen to separate the tip from the lower part of the coleoptile in his experiments on phototropism?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Boysen-Jensen's experiment showed that a permeable barrier (like agar or mica) placed between the tip and the base of the coleoptile did not prevent phototropism, suggesting a chemical signal was transmitted. An impermeable barrier like a metal sheet would block the signal.
Hint
This experiment aimed to determine if a chemical signal or a physical stimulus was responsible for the plant's response to light.