EXAM II HORT 326 March 27, 2007 Indicate the most correct answer in the left hand column (38 pts @ 2 pts/question). _______1. Which plant growth regulator would most likely be commercially used for propagating root and leaf cuttings? a. 2,4-D b. IBA c. GA d. Kinetin e. ABA ______2. The following rooting preparation is a liquid concentrate containing more than one auxin compound. a.Dip ‘N Grow b.Hormodin 1&3 c.Hare’s rooting powder d.a & b e. b & c ______3. Which type of bud has the greatest potential to act as a competing sink and inhibit rooting of a cutting: a. vegetative terminal bud b. vegetative axillary bud c. adventitious bud d. flower bud e. mixed bud ______4. In easy-to-rootplant species, roots of stem cuttings form most frequently from: a. phloem ray parenchyma cells b.sclereids c.callus c.xylem ray parenchyma cells d.pith ______5. In stem chimeras: a. mericlinal chimeras become either periclinal or normal b. sectorial chimeras become either periclinal or sectorial c. periclinal chimeras become either mericlinal or normal d. periclinal chimeras become either sectorial or mericlinal e. sectorial chimeras become either mericlinal or normal ___ _6. The use of mist systems for propagation: a. can sometimes adversely cool down the propagation media which reduces rooting b. increases the window of time for propagating different types of cuttings c. can cause nutrient leaching of cuttings d. a, b & c e. b & c
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2______7. In difficult-to-rootplant species, roots of stem cuttings form most frequently from: a. phloem ray parenchyma cells b.callus c.pith d.sclereids e.xylem ray parenchyma cells ______8. The two most important stages in de novoadventitious root formation are: a. dedifferentiation of parenchyma cells and primordia development b. elongation of primordia and dedifferentiation of parenchyma cells c. primordia development and elongation of primordia d. root initial formation and primordia development e. dedifferentiation of parenchyma cells and root initial formation 9. Wounding of cuttings has the following effect: a. creates a sink area that stimulates cell division b. stimulates auxin accumulation and ethylene evolution c. adds an additional propagation step that is only cost-effective with some plant species d a, b & c e. a & c _____10. Exposing stock plants to long days and warm temperatures has the following effect: a. increases auxin levels b. increases cytokinin levels c. increases adventitious root formation d. a & c e. b & c _____11. The following CHO/N ratio of stock plants most likely favors rooting of softwood cuttings: a. low CHO/high N b. high CHO/high N c. high CHO/low N d. low CHO/low N e. none of the above _____12. For successful acclimatization of tissue culture-produced plantlets the following must occur: a. plantlets need to become heterotrophic by increasing photosynthesis b. the leaf needs to form better developed cuticle c. better stomatal control needs to occur to control water loss d. a, b & c e. b & c _____13. What plant growth regulator is most likely to be used for propagating stem cuttings a. ethylene b. BA (BAP) c. IBA d. ABA e. IAA