nastic notes

Question 1

what is a nastic responce

Answer 1

growth responses of plants in response to a change in the intensity of an environmental stimulus, not the direction.

Question 2

how do we name nastic responces

Answer 2

We do not use the words positive or negative because the growth responses are not directional. Instead, identify the environmental factor and place that in front of the word ‘nasty’. For example:

· The opening and closing of flowers when the sun rises and sets is called a photonastic response
· The closing up of Mimosa leaves in response to touch is a thigmonastic response

Question 3

what are examples of thigmonasty

Answer 3

• venus fly trap
• mimosa leaves