Tropism and Turgor

Question 1

Tropisms

Answer 1

The growth of part of a plant towards or away from an environmental stimulus.

Question 2

Positive vs negative tropism

Answer 2

If the growth is towards the stimulus, the tropism is = positive
away from the stimulus =negative.

Question 3

Are roots positively or negatively geostrophic

Answer 3

positively geotropic – they grow down, and shoots are negatively geotropic – they grow up

Question 4

Some roots grow away from copper pipes – they are

Answer 4

negatively chemotropic

Question 5

grow towards a supporting structure such as another plant.

Answer 5

positively thigmotropic

Question 6

Turgor Responses

Answer 6

responses of plants to stimuli from the environment that do not come from a particular direction.

Question 7

Examples of Turgor Responses

Answer 7

changes in temperature, light intensity, humidity and touch.

Question 8

Examples of Turgor Responses

Answer 8

The leaves of the Venus Fly Trap and the Mimosa plants both close up in response to touch
flowers and leaves of many plants close up when the light intensity decreases (dones’t matter were light is or isn’t)

Question 9

Examples of Tropisms

Answer 9

Photo - light
Geo or Gravi - gravity
Hydro - water
Chemo - chemical
Thigmo - touch

Question 10

Tropism vs Turgor

Answer 10

Tropisms are a directional response, the stimulus (eg. sunlight through a window) determines the direction the plant grows.

Tropisms are generally slow growth changes

Turgor Responses are not the result of a stimulus from a certain direction.

Turgor Responses can be fast and do not result from cell growth