Plant responses: investigating tropisms

Get Revising

Created by: Esme.B
Created on: 01-11-17 14:11

Definition of Geotropism

A directional growth response to gravity

1 of 10

Definition of phototropism

A directional growth response to light

2 of 10

List the 5 types of meristem which provoke the growth of the plant.

1. Apical meristems 2. lateral meristems 3.root tips 4. shoot tips 5.Intercalary meristem

3 of 10

Give an example of an experiment which investigates the phototropic responses?

1. control plant=illuminated from all sides. 2. experimental plant=illuminated from just one side. Results demonstrate- shoot bend towards light because the shady side of the shoot elongated more than illuminated side/

4 of 10

What's the main result displayed by the experiment of the plants being illuminated?

Mean + standard deviation of the lengths between the marks has increased on the shady side.

5 of 10

Give an example of an experiment which investigates the geotropic responses?

1. control plant= constantly spun by a Klinostat(ensure gravity is applied equally on all sides) -root+shoot grow horizontally. 2. experimental plant=root bends downwards+shoot bend upwards due to lower side of shoot elongated more than the upper sid

6 of 10

What did Darwin's experiment confirm?

Shoot tip= responsible for phototropic responses.

7 of 10

What did Boysen-Jensen's work confirm?

1. water/or solutes need to be able to move backwards from shoot tip for phototropism to happen. 2. Permeable gelatine inserted behind shoot tip=positive phototropism.3. Impermeable mica block inserted =no phototropic response.

8 of 10

What effect does agar have on auxin?

1. agar blocks impregnated with different Conc of auxin=same results 2. using a series of different Conc of auxin(created by serial dilution)= gives shoot curvature in proportion to amount of auxin.

9 of 10

where's auxins produced?

Apex of the shoot

10 of 10

Other cards in this set

Card 2

Front

Definition of phototropism

Back

A directional growth response to light

Card 3

Front

List the 5 types of meristem which provoke the growth of the plant.

Back

Card 4

Front

Give an example of an experiment which investigates the phototropic responses?

Back

Card 5

Front

What's the main result displayed by the experiment of the plants being illuminated?

Back

View more cards

Get Revising

Plant responses: investigating tropisms