Biology of Plants Spring 1994 | ## Exam II | Name_________________ |
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This take home exam is due at 4 PM on Friday, March 18, 1994. [note: in the printed version, questions appeared on a separate pages marked here with a horizontal rule]

Segment | Interphase | Prophase | Metaphase | Anaphase | Telophase | Sum PMAT |
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A | 500 | 20 | 2 | 3 | 15 | |

B | 250 | 15 | 3 | 2 | 15 | |

C | 50 | 3 | 0 | 0 | 0 | |

D | 40 | 0 | 0 | 0 | 0 |

Complete the table and analyze completely the results in the space below.

Why does the plant need a new fusiform initial?

When a fusiform initial divides in the ____________________ plane a (group of) ray initial is formed.

What is the function of a ray initial and its cellular products?

Why would a plant need to make more ray initials (Hint: doesn't it already have enough ray initials in the cambium?)?

The chemical produced in abundance by cambium initials is ___________________.

When a fusiform initial divides in the ____________________ plane a derivative is made.

If the inner cell matures the derivative becomes a cell of the _______________ tissue.If we turn our attention to the cork cambium, all the initials are the same because they have the same dimensions. Why does the cork cambium not need special ray initials?A chemical produced in abundance by this derivative is ___________________.If the outer cell matures, the derivative becomes a cell of the _______________ tissue.A chemical produced in abundance by this derivative is ___________________.

When a cork cambium initial divides in the ____________________ plane a derivative is made.

If the outer cell matures, the derivative becomes a cell of the _______________.A chemical produced in abundance by this derivative is ___________________.If the inner cell matures, the derivative becomes a cell of the _______________. Why is this derivative not sclerenchyma?

The problem is best visualized sideways: [better in printed version too: walls can be distinguished in the original, Y is printed as the Greek letter psi, and the cells are all the same size. Netscape does not respond to the Colspec and Math html commands so this is not possible to render properly on your WWW browser, sorry.]

Sea WaterYs = -25 Yp = Ym = Y= | Cell 1 | Cell 2 | Cell 3 | Cell 4 | AtmosphereYs = -225 Yp = Ym = Y= |
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water- | proof | polysaccharide | matrix | ||

Ys = Yp = Ym = Y= | Ys = Yp = Ym = Y= | Ys = Yp = Ym = Y= | Ys = Yp = Ym = Y= | ||

water- | proof | polysaccharide | matrix |

List the assumptions you have made in coming up with your solution.

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