Ch 39: Control Systems In Plants

Question 0

Cytokinin

Answer 0

Modified form of adenine

Stimulates cytokinesis->cell division

Question 1

Auxin

Answer 1

Produced mainly in apical meristem

Promotes cell elongation, fruit growth

Question 2

Gibberellins

Answer 2

Produced primarily in roots and young leaves

Leave/stem elongation, fruit growth, germination

Question 3

Abscisic acid

Answer 3

Produced in the terminal bud (ABA)

Suspends growth

Question 4

Ethylene

Answer 4

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

Question 5

Phototropism

Answer 5

Grow toward or away from light

Question 6

Gravitropism

Answer 6

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

Question 7

Thigotropism

Answer 7

Touch

Question 8

Short-day plants

Answer 8

Require light period shorter than critical length

Flower in fall and winter

Question 9

Long-day plants

Answer 9

Require light period longer than critical length

Spring and summer flowers

Question 10

Day-neutral plants

Answer 10

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

Question 11

Hormone

Answer 11

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

Question 12

Tropisms

Answer 12

Orient growth toward or away from stimuli

Question 13

Photoperiodism

Answer 13

A physiological response to day length