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Unformatted text preview: Question: I was a bit confused on the R and Fr...in one side you said Pfr stimulates germination and Pr inhibits germination but in another slide you said germination is induced by r and inhibited by fr. Can you please explain this to me? Answer: The thing to remember about phytochromes is that the Pr form *responds* to red light and coverts to the Pfr form, which is the *active* form. The Pfr form *responds* to far red light and converts to the Pr form, which is the *inactive* form. SO, germination is induced by Red light (which coverts Pr to Pfr, the active form) and inhibited by Far red light (which converts Pfr back to Pr, the inactive form). The letters behind the P tell you which light will cause the phytochrome to convert. Question: Chapter 30 Self Quiz #10: It says gymnosperms and angiosperms have the following in common except: (and the answer is) ovaries. Why is that?? Answer: The fast answer is that only angiosperms have ovaries. Gymnosperms have seeds that develop on the underside of the cone, and are not surrounded (and protected) by an ovary. Question: Concept Check for 35.4 #1: It says that if a sign is hammered into a tree 2 m from the base and the tree is 10m and elongates 1 m each year it will still be 2 m high. I do not understand this....
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This note was uploaded on 04/10/2008 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.
- Fall '08