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Flashcards in Lab 9 Deck (12)
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1

when a plant is faced horizontally, the growing zone of root will curve downward displaying --

positive gravitropism

2

when a plant is faced horizontally, the shoot portions will bend upwards displaying

negative gravitropism

3

plant organs such as shoots or coleoptiles can display positive phototropism bending --

towards light

4

roots can display negative phototropism bending --

away from light

5

in darkness, plant may develop -- characterized by long, weak stems and smaller leaves due to longer internodes and a pale yellow color

etiolation

6

pale yellow color

chlorosis

7

gravitropism and phototropism are mediated by -- of auxin --> higher [auxin] and higher elongation rate on one side of an expanding plant organ

later redistribution

8

the resulting differential growth between two side results in a curvature of the organ -- the side with the higher [auxin]

away

9

explanation of tropism

Cholodny-Went theory

10

gravity sensing in roots occurs in specialized cells of he root cap containing large starch grains known as --

statoliths

11

starch grains are free to sediment within the cell according to the gravitational field and provide -- through their contact with different areas of the ER/plasma membrane

directionality

12

phototropism is a -- response mediated by -- photoreceptors generally localized to the tips of coleoptiles and shoots

blue light