Responses to Stimuli: Plant Growth Factors Flashcards Preview

A2 Biology: Response to Stimuli > Responses to Stimuli: Plant Growth Factors > Flashcards

Flashcards in Responses to Stimuli: Plant Growth Factors Deck (10):
1

how do plants respond to light?

shoots grow towards light (are positively phototropic)

2

why do plants respond to light?

as light is needed for photosynthesis

3

how do plants respond to gravity?

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

4

why do plants respond to gravity?

as plants need to be firmly anchored into the soil

5

how do plants respond to water?

roots grow towards water (are positively hydrotropic)

6

why do plants respond to water?

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

7

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

plant growth factors

8

what do plant growth factors influence?

the affect of the plant's growth

9

where are plant growth factors made?

made by cells located throughout the plant rather than specific organs

10

are plant growth factors produced in small or large quantities?

produced in small quantities