B1.6 Nervous System and Hormones - Plant Hormones Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Auxins

A

Plant hormones that coordinate and control cell growth in response to light and gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Tropism

A

When an organism such as a plant responds to a stimulus by turning or growing in a certain direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Phototropism

A

A change in the direction of a plant in response to light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Positive phototropism

A

Positive phototropism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Negative phototropism

A

Plant roots grow away from light sources as darker conditions such as the soil are more likely to provide moisture and minerals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Tips of shoots and roots

A

Known as apical meristems, where auxins are produced in plants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Effect of auxins in shoots

A

Auxins accumulate on the shaded side of plant shoots and promote cell elongation, causing the shoots to grow towards light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Effect of auxins in roots

A

Auxins accumulate on the lower side of plant roots and inhibit cell growth, causing the roots to grow towards gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Cell elongation in shoots

A

Shaded cells stretch more in plant shoots so that the shaded side becomes longer than the light side, resulting in the shoots growing towards light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Inhibition of cell growth in roots

A

Cells on the lower side of plant roots stretch and grow less than cells on the upper side, causing the roots to grow down towards gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Diffusion

A

Auxin molecules are originally equally distributed from the tips of shoots and roots via diffusion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Unequal distributions

A

Gravity and light causes auxins to diffuse unevenly and move towards a shaded side or a side closer to the centre of gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Foil covering plant shoot tips

A

Plant shoots grow upwards but do not grow towards light if foil covers plant tips, suggesting the tips of shoots are sensitive to light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Foil covering plant shoot stems

A

Plant shoots continue to grow towards light if foil covers stems, suggesting the stems and lower parts of shoots are not sensitive to light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly