Plant Physiology | Lesson 6

Question 1

Transpiration

Answer 1

Water needed for photosynthesis, cooling, turgor

Question 2

Respiration

Answer 2

CO2 in, O2 out

Question 3

Abscisic Acid (ABA)

Answer 3

Produced in terminal buds. Inhibit growth for maristems in prep for winter
Inhibit seed germination
Close stomata

Question 4

Gibberellins

Answer 4

Produced in roots + young leaves

Seed germination, elongation of internodes

Question 5

Ethylene

Answer 5

Ripen fruit + rot

Question 6

Cytokinin

Answer 6

Cell growth + division
Phototropism w/ auxin
Apical dominance: against auxin
Produced in roots and transported upwards

Question 7

Auxin

Answer 7

Cell elongation
Phototropism in tip, move away from sun + keep growing so plant “leans” towards sun
Wound healing
Apical dominance: grow 1 bigger flower
Gravitropism: gather towards lowerside of shoot + grow so eventually bends upwards

Question 8

Photoperiod

Answer 8

Photochromes
Short day = fall bloomers. Pfr inhibit
Long day = spring bloomers Pfr stimulate