Plant Physiology (Biology 327)
- Dr. Stephen G. Saupe; College of St. Benedict/ St.
University; Biology Department; Collegeville, MN 56321; (320) 363 - 2782;
(320) 363 - 3202, fax;
Exam Questions: Plant Responses to the
- Explain why roots grow down and shoots grow up [include signal, receptor
(nature, location), transducing mechanism, response]. Or, in other words,
how does gravitropism work? Provide evidence to support your response.
- Explain why shoots bend toward the light (include signal, receptor,
transducing mechanism, response). Or, in other words, how does phototropism
work? Provide evidence to support your response.
- Phytochrome is a pigment responsible for a
variety of photomorphogenic responses in plants. Describe the photochemical
and biochemical properties of phytochrome. Include in your response such
topics as nature of the protein, chromophore, conformational/chemical
changes, regulation, localization in the plant. Also include a discussion of
the three major phytochrome-mediated responses and provide an example of
- Describe the sequence of events necessary for
a plant to flower. (hints: ripeness to flower, juvenility, apex changes).
Then describe vernalization. Include a discussion of stimulus, receptor,
transducing mechanism (including hormone(s) involved) and physiological
- Discuss photoperiodism including stimulus,
receptor and transducing mechanism. Where appropriate provide evidence to
support your response.
- Describe the physiological
strategies used by spring wildflowers to survive conditions in the spring.
01/07/2009 � Copyright by SG