37. Plant Sensation and Response

A conformational change in a substance called phytochrome __________.

What happens immediately after a phytochrome is activated by light?

You are interested in determining what part of a plant senses the light, which leads to phototropism. A good first experiment would be to __________.

Some seeds require light for germination. This process is controlled by the phytochrome system. Which of the following germination treatments would inhibit germination of such seeds?