Question Detail
Question
Peter Boysen-Jensen discovered in 1913 that the growth stimulus could pass through which substance?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Boysen-Jensen showed the stimulus could diffuse through a permeable barrier like gelatin but was blocked by an impermeable one like mica.
Hint
Think of a 'jelly-like' substance that allows things to seep through.