Plant hormones Flashcards
1
Q
What is a stimulus
A
A change in environment that causes a response by an organism
2
Q
Tropism
A
responding to stimulus by growing towards or away
3
Q
Phototropism
A
tropism caused by light
4
Q
What is a positive tropism
A
a tropism towards a stimulus
5
Q
Plants shoots are…
A
positively phototropic
6
Q
Plant roots are…
A
negatively phototropic
7
Q
Which plant hormone causes positive phototropism
A
Auxins
8
Q
What do auxins do
A
In shoots, auxins cause cells to elongate. They always move to the tip, which is how the growth of the plant occurs
9
Q
What affect do auxins have in the root tips
A
they cause cells to STOP elongating which causes gravitropism. Gravitropism helps roots to anchor the plant in place and reach moisture underground
10
Q
Gravitropism
A
growth towards the direction of gravity
