B11.9 - Plant hormones

Question 1

tropisms

Answer 1

response of plants root/shoots to light / gravity

Question 2

phototropism

Answer 2

response to light

Question 3

gravitropism

Answer 3

response to gravity

Question 4

auxin

Answer 4

hormone that controls light and gravity response

Question 5

auxin response occurs when

Answer 5

uneven distribution of auxin growing = unequal growth rate

Question 6

auxin is found where in plants

Answer 6

tips of roots and shoots
dissolves and moves around

Question 7

Auxin in phototropism

Answer 7

-always is found in shaded region
-causes cell elongation of shoot cells here
-so this area grows much faster = bends toward light source

Question 8

when does the shoot grow straight

Answer 8

when light fall is even
-auxin is equal

Question 9

Auxin in gravitropism

Answer 9

-auxin is found in lower region
-inhibits growth of root cells here
-higher side grows faster

Question 10

roots are

Answer 10

negatively phototropic
positively gravitropic

Question 11

shoots are

Answer 11

positively phototropic
negatively gravitropic

Question 12

gibberellins

Answer 12

initiate seed germination
-trigger break downs of food storage in seed
-stimulates growth of stems

Question 13

ethene gas

Answer 13

controlls cell division

Question 14

Plant cuttings growth pro

Answer 14

little variation

Question 15

plant cuttings process

Answer 15

-take piece of stem and place in soil
-new roots can form
-add rooting powder = better success

Question 16

rooting powder

Answer 16

contains auxin
-stimulates growth

Question 17

rooting powder pros

Answer 17

-helps horticulturists and gardeners to produce large number of successful cuttings

Question 18

auxin as weed killers

Answer 18

-effects broad leafed weeds not crops
-stimulates uncontrolled rapid growth = death
-sprayed on and is absorbed

Question 19

auxin in plant cloning cultures

Answer 19

-stimulates growth + cell division
produces identical plants

Question 20

use of gibberellins

Answer 20

end seed dormancy - speed up germination in malt industry
-promote flowering
-increase size and yield of fruit

Question 21

use of ethene

Answer 21

-controls ripening of fruit
-rapidly ripens fruit for sale