Download chapter 39-multiple choice quiz - mr-youssef-mci

CHAPTER 39-MULTIPLE CHOICE QUIZ
1. The term etiolation refers to:
a) The greening of plants (expansion of leaves, elongation of roots, production of chlorophyll)
b) Morphological adaptations for growing in darkness
c) The growth response that results in curvatures of whole plant organs toward/away from stimuli
d) The effects of light on plant morphology
e) Cycles with a frequency of 24 hours
2. From experiments on phototropism, the Darwin’s concluded that:
a) it was the tip of the coleoptile that was responsible for sensing light
b) a chemical (auxin) produced in the coleoptile tip that stimulated growth
c) it was actually the some distance below the tip that the curvature of coleoptile actually occurred
d) both a) and b)
e) both a) and c)
3. Which of the following statements about plant hormones is false?
a) Plant hormones are molecules that involve passage through cell walls
b) Hormones control plant growth and development by affecting the division, elongation and
differentiation of cells
c) Each hormone has multiple effects depending on site of action, concentration and development
stage of plant
d) Plant hormones are produced in very low concentrations, but have large effects
e) None of the above
4. The role of cytokinins in plant cells is to:
a) Slow the aging of some plant organs by inhibiting protein
b) Increase leaf abscission (loss of leaves) and promote xylem differentiation
c) Enable plants to withstand droughts
d) Control the balance of ethylene and auxin
e) Promote cell apoptosis
5. The ripening of fruit is due to:
a) Gibberellins
b) Auxin
c) Carbon dioxide
d) Ethylene gas
e) Brassinosteroids
6. Plants can detect what about light?
a) Presence
b) Direction
c) Intensity
d) Wavelength
e) All of the above
7. The term used to define the pre-treatment of plants to cold temperatures to induce flowering is:
a) Florigen
b) Endogenous
c) Vernilization
d) Photomorphogenesis
e) Photoperiodism
8. Which of the following is an example of a short-day plant?
a) Poinsettias
b) Spinach
c) Tomatoes
d) Dandelions
e) rice
9. The coiling of vines around supports is due to:
a) responses to gravity
b) directional growth in response to touch
c) specialized plastids containing dense starch grains
d) Water deficiency
e) Both a) and b)
10. A Virulent pathogen is one that:
a) Will only mildly harm but not kill the host plant
b) A plant has little or no defence against
c) Cannot enter a host plant
d) Causes vigorous side effects after being present for some time
e) None of the above
SHORT ANSWER
What is a hormone? Choose two and explain their roles in plant cells.
Multiple Choice Answers: 1.B 2.E 3.E 4.A 5.D 6.E 7.C 8.A 9.B 10. B
RESPONSE TO SHORT ANSWER QUESTIONS:
HORMONES :
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chemical signals that coordinate different parts of an organism
produced in one part of the body and then transported to other parts
bind to a specific receptor, triggering responses in target cells/tissues
only minute amounts are required to induce substantial changes in an organism
controlled by responses in environment stimuli