Tropisms

Question 1

What is a tropism?

Answer 1

A plant’s growth response to an environmental stimulus

Question 2

What plant hormone is responsible for tropisms?

Answer 2

Auxins

Question 3

What is phototropism?

Answer 3

A plant’s response to light

Question 4

What is positive phototropism?

Answer 4

Growth towards light (e.g. Stem bending towards a window )

Question 5

What is negative phototropism?

Answer 5

Growth away from light (rare)

Question 6

How does auxin cause phototropism?

Answer 6

Auxin collects on the shaded side, causing cells there to grow longer & bend the plant toward the light

Question 7

What is gravitropism?

Answer 7

A plant’s response to gravity

Question 8

What is positive gravitropism?

Answer 8

Growth with gravity - roots grow downward

Question 9

What is negative gravitropism?

Answer 9

Growth against gravity - stems grow upward

Question 10

What is thigmotropism ?

Answer 10

A plant’s response to touch

Question 11

What is an example of thigmotropism?

Answer 11

Tendrils of a vine wrapping around a stick or wire