Responses to Stimuli: Plant Growth Factors

Question 1

how do plants respond to light?

Answer 1

shoots grow towards light (are positively phototropic)

Question 2

why do plants respond to light?

Answer 2

as light is needed for photosynthesis

Question 3

how do plants respond to gravity?

Answer 3

roots are sensitive to gravity and grow in the direction of its pull (are positively gravitropic)

Question 4

why do plants respond to gravity?

Answer 4

as plants need to be firmly anchored into the soil

Question 5

how do plants respond to water?

Answer 5

roots grow towards water (are positively hydrotropic)

Question 6

why do plants respond to water?

Answer 6

as plants need to absorb water for photosynthesis and other metabolic reactions, as well as for support

Question 7

plant responses to external stimuli involve hormone-like substances called what?

Answer 7

plant growth factors

Question 8

what do plant growth factors influence?

Answer 8

the affect of the plant’s growth

Question 9

where are plant growth factors made?

Answer 9

made by cells located throughout the plant rather than specific organs

Question 10

are plant growth factors produced in small or large quantities?

Answer 10

produced in small quantities