Chapter 16 Study Questions

  1. Distinguish between the following types of plant responses to sunlight: solar tracking, photoblasty, photomorphogenesis, phototropism, photonasty, nyctinasty, and photoperiodism.

  2. Textbook Reference: Introduction, p. 447

  3. Discuss how comparisons of absorption spectra and action spectra have aided the identification of phytochrome as the photoreceptor involved in red/far-red responses.

  4. Textbook Reference: Plant Photoreceptors, pp. 450–451

  5. Describe the three main categories of phytochrome responses and the types of phytochromes that regulate them.

  6. Textbook Reference: Phytochrome Responses, pp. 457–459

  7. Discuss the role of phytochrome interacting factors (PIFs) in photomorphogenesis.

  8. Textbook Reference: Phytochrome Signaling Pathways, pp. 460–461

  9. What are cryptochromes and how do they function during photomorphogenesis?

  10. Textbook Reference: Cryptochromes, pp. 463–466

    What are phototropins and how are they regulated by blue light?

    Textbook Reference: Phototropins, pp. 467–470

  11. Create a diagram showing the signal transduction pathway for phototropin-mediated, blue light-induced stomatal opening.

  12. Textbook Reference: pp. 471–473