BSC11_Ch39PracQsS06

BSC11_Ch39PracQsS06 - Chapter 39: Plant Respons e s to...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 39: Plant Responses to Internal and External Signals To receive instant feedback for this self-study quiz, click the Check Answers button. Self-study quizzes are not recorded in your course gradebook, and you may take them as many times as you like. These questions are specific to your textbook and have been provided to reinforce chapter materials.   Chapter Quiz 1 .A conformational change in a substance called phytochrome _____. (Concept 39.1) [ Hint ]   causes a plant to bend toward light   triggers fruit drop   leads to de-etoliation   is responsible for gravitropism   causes changes in a plant in response to stresses such as water shortage 2 .Growth that results in curvatures of whole plant organs toward or away from stimuli is called _____. (Concept  39.2) [ Hint ]   gravitropism   phototropism   thigmotropism   heliotropism   all of the above 3 .You are interested in determining what part of a plant is actually sensitive to light for phototropism. A good  first experiment would be to _____. (Concept 39.2) [ Hint ]   remove the apical meristem and apply auxin before beginning light treatments  
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
shine light from one side only. Then measure the auxin diffusing down the stem on the light and the shaded  sides   cover one part (for instance, the tip or base) before beginning light treatments   spray auxin on just one part of the plant at a time to determine which one stimulates flowering   try light treatments of different colors (first blue, then yellow, then green) to see which promotes flowering the  fastest 4 . The immediate, direct effect of auxin in cell elongation, according to the acid growth hypothesis, is to _____.  (Concept 39.2) [ Hint ]   increase the hydrostatic pressure in cells, stretching their walls   activate ATP-driven proton (H+) pumps   shift the pH and thus activate enzymes that break the hydrogen bonds   move water into vacuoles   activate the synthesis of new cytoplasm 5 A graduate student growing plant cells in a laboratory dish wants them to _____; therefore, the student treats  them with cytokinins. (Concept 39.2) [ Hint ]   enlarge   become dormant   grow roots   produce auxin   divide 6 .A callus will develop roots if you use a _____ auxin concentration and a _____ cytokinin concentration in the  medium. (Concept 39.2) [ Hint ]
Background image of page 2
  high . .. high   high . .. low   low . .. high   low . .. low   low . .. high or low 7. In shoots, branching is inhibited by _____ from the tip of a growing shoot, but this effect is countered by  _____ from the roots. (Concept 39.2) [ Hint ]   cytokinins . .. auxin   gibberellins . .. ethylene   auxin . .. cytokinins   gibberellins . .. abscisic acid
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

BSC11_Ch39PracQsS06 - Chapter 39: Plant Respons e s to...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online