Hort 326 Plant Propagation exam 1

Hort 326 Plant Propagation exam 1 - EXAM I HORT 326...

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EXAM I HORT 326 FEBRUARY 15, 2007 Indicate the most correct answer in the left hand column (2 pts./question = 32 pts.). _____1. In apomixis, development of the embryo from the nucellus is characteristic of : a. adventitious embryony b. nucellar embryony c. nonrecurrent apomixis d. a & b e. b & c _____2. The formation of the embryo sac does NOT include the following cells or nuclei: a. polar nuclei b. antipodals c. generative cell d. egg cell e. synergids _____3. A short-day plant has a critical photoperiod of 13 hours. The plant will flower when: a. the photoperiod is greater than 13 hours b. the photoperiod is less than 13 hours c. the photoperiod is equal to 13 hours d. a & c e. b & c _____4. An angiosperm seed typically does NOT derive its food reserves from the following tissue: a. perisperm b. endosperm c. nucellus d. hypocotyls e. female gametophytic tissue _____5. The following phytohormone/plant growth regulator is found in liquid endosperm of coconuts and corn and is important in cell division a. auxin b. gibberellic acid (GA) c. cytokinin d. abscisic acid (ABA) e. ethylene _____6. In recurrent apomixis, the embryo may develop from: a. megaspore mother cell b. a pollen grain in a tissue culture system c. the egg nucleus without fertilization d. a & b e. b & c
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-2- ____ 7. A phytohormone (plant hormone): a. acts as a signal (signal transduction) to regulate growth b. is generally translocated from the site of synthesis to the plant part where it influences certain physiological responses c. affects plant growth and development in large concentrations d. a, b, & c e. a & b ____8. Pelletized (Pelleted) seed: a. improves the seed surface of irregularly shaped seed for easier handling with precision seeders b. can have mycorrhiza, rhizobium and biostimulants encapsulated with the seed c. are routinely used to encapsulate seed chits d. a & b e. b & c ____9. High levels of this hormone are often associated with inhibiting seed germination: a. ABA b. auxin c. gibberellic acid d. cytokinin e. ethylene _____10. Which dormancy requires both a cold-moist and warm-moist for the seed to germinate. a. thermodormancy b. double dormancy c. external dormancy d. rudimentary embryo e. physiological deep dormancy _____11. In certain plants where the phytochrome system controls seed germination: a. far-red light produces more phytochrome far-red pigment which inhibits germination b. darkness has no effect on phytochrome red pigment c. far-red light produces more phytochrome far-red pigment which promotes germination d. red light produces more phytochrome far-red pigment which promotes
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Hort 326 Plant Propagation exam 1 - EXAM I HORT 326...

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