co ordination & response in plants

Question 1

define sensitivity

Answer 1

ability of living organisms to respond to a stimulus

Question 2

define stimulus

Answer 2

a change in environment (internal or external)

Question 3

define tropism

Answer 3

growth movements related to directional stimuli

Question 4

define gravitropism (geotropism)

Answer 4

the response in which parts of a plant grow towards or away from gravity

Question 5

define phototropism

Answer 5

a response in which parts of a plant grow towards or away from light

Question 6

what response is seen by a stem?

Answer 6

positive phototropism and negative gravitropism

Question 7

what response is seen by a root?

Answer 7

positive gravitropism and negative phototropism

Question 8

what is the hormone that controls plant enlargement?

Answer 8

auxin

Question 9

where is auxin produced?

Answer 9

in the tips of roots and shoots that are actively growing

Question 10

what effect does auxin have in the elongation of shoots and roots?

Answer 10

in roots- elongation slow
in shoots- elongation quick

Question 11

if kept in light, where does auxin move?

Answer 11

to the shaded region of the plant