Ch 39: Control Systems In Plants Flashcards Preview

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Flashcards in Ch 39: Control Systems In Plants Deck (14):
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Auxin

Produced mainly in apical meristem
Promotes cell elongation, fruit growth

1

Cytokinin

Modified form of adenine
Stimulates cytokinesis->cell division

2

Gibberellins

Produced primarily in roots and young leaves
Leave/stem elongation, fruit growth, germination

3

Abscisic acid

Produced in the terminal bud (ABA)
Suspends growth

4

Ethylene

Gaseous hormone
Growth inhibitor, fruit ripening, aging
High auxin concentrations induce release of ethylene

5

Phototropism

Grow toward or away from light

6

Gravitropism

Gravity
Roots= positive gravitropism (grow downward)
Shoots= negative + grow upward

7

Thigotropism

Touch

8

Short-day plants

Require light period shorter than critical length
Flower in fall and winter

9

Long-day plants

Require light period longer than critical length
Spring and summer flowers

10

Day-neutral plants

Unaffected by photoperiod + flower when they reach a certain stage at maturity

11

Hormone

A compound produced 1 part of body + transported to other parts + trigger a response

12

Tropisms

Orient growth toward or away from stimuli

13

Photoperiodism

A physiological response to day length