Plant responses - Miss Parry

Question 1

What is a Tropism?

And what is the difference between a negative and positive one?

Answer 1

The directional responce of a plant to a stimulus
Positive = Grows towards the stimulus
Negative = Grows away from the stimulus

Question 2

What do Cytokinins do?

Answer 2

Promote cell division

Question 3

What is the funciton of Abscisic acid?

Answer 3

Inhibit seed germination and growth

Question 4

Where is intercalary meristem found?

And what occurs here?

Answer 4

Between nodes

Cell division

Question 5

What is another name for the of tips and roots, that allow them to grow?

Answer 5

Apical meristem

Question 6

How do auxins move around?

Answer 6

By diffusion

Question 7

How are auxins broken down after they have been used?

Answer 7

By enzymes futher down the shoot

Question 8

What is Abscission?

Answer 8

Leaf fall (loss of leaves)

Question 9

Explain how abscission occurs?

Answer 9

Auxin production in the leaf tip drops
Cells in the abscisison zone become more sensitive to ethene
Ethene production increases due to the drop in auxin concentration
The increase in ethene causes cellulase to be made, which breaks down the cell walls of the leaf
So the leaf is seperated from the stem

Question 10

Explain Apical dominance

Answer 10

The apical bud is removed, side shoots will grow due to the decrease in auxin concentration (which usually inhibits side shoot growth)

Question 11

What allows stem elongation to occur?

Answer 11

Gibberellin