Sum of the

Examination of a typical dicotyledon seed reveals that itA. Is made mostly of meristematic tissue used for the storage of food
B. Can be stimulated to germinate by an application of abscisic acid
C. Forms from the union of a microspore mother cell with a megaspore mother cell
D. Shows the presence of a well-developed coleoptile
E. Contains a first-foliage plumule formed at the apical meristem

11. Which of the following most directly controls the flowering response in short-day plants?A. Length of the light period
B. Length of the dark period
C. Relative amount of blue light available during the light period
D. Intensity of light during the light period
E. Air temperature during the dark period

12. Which of the following is LEAST likely to be a factor in the movement of water through a terrestrial plant?A. The cohesion of water
B. The influence of gibberellin on cell expansion
C. Capillary action
D. Root pressure
E. The evaporation of water from the leaves

13. A scientist measured the water content of leaves from two different groups of oak trees on three different summer days. One group of leaves, the T group, came from trees that had been defoliated by gypsy moths the previous year. The other leaves, the C group, came from trees that had not been defoliated. The results, in milliliters of water per gram of dry weight, are shown in the table below. June 10 June 30 July 28 T Group 26.8 20.4 12.7 C Group 32.5 28.7 22.7 All of the following are valid interpretations of these data EXCEPTA. C leaves typically contain more water than do T leaves
B. Both C and T leaves show declines in water content as the summer goes on.
C. T leaves show greater declines in water content than do C leaves.
D. Defoliation by gypsy moths has no effect on the water content of next year’s leaves.
E. Differences in the water content between C and T leaves grow greater as the summer goes on.

14. Root hairs are extensions of which of the following kinds of cells?A. Cortical
B. Xylem
C. Phloem
D. Epidermal
E. Meristematic

15. Girdling of a tree by completely removing a ring of bark most directly affects the process ofA. Translocation
B. Transpiration
C. Photosynthesis
D. Countercurrent exchange
E. Cellular respiration

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