B3.2 Plant Hormones

Question 1

positive and negative tropism

Answer 1

when a plant grows towards/away from a stimulus

Question 2

phototropism

Answer 2

growing towards sunlight

more photosynthesis

Question 3

gravitropism/geotropism

Answer 3

growing with gravity
positive(roots)-good anchor and can reach nutrients
negative(stem)-compete with other plants for sunlight

Question 4

auxin

Answer 4

enables plant to grow towards/away from a stimulus
auxin in shoots exhibit growth
auxin in roots inhibit growth (lots of auxin=no growth)

Question 5

auxin in phototropism

Answer 5

the sun breaks down the auxin so the auxin is more concentrated in the shade side.
the auxin exhibits growth so it grows on that side causing it to lean towards the sun

Question 6

auxin in gravitropism

Answer 6

the auxin gathers at the bottom due to gravity

this causes the top side to elongate thus causing the roots to bend downwards

Question 7

uses of plant hormones

Answer 7

auxin - elongate cells for bigger products
ethene - a gas that stimulates conversion of starch to sugar to ripen fruit
gibberellins - promotes growth to quicken production of a crop

Question 8

killing weeds

Answer 8

auxin is used to make the weed grow too uncontrollably and die in the process

Question 9

promoting root growth

Answer 9

auxin (rooting powder) is used to create identical plant with bigger root to be a better anchor and to get more nutrients

Question 10

delaying ripening

Answer 10

auxin is used to delay ripening

Question 11

promote ripening

Answer 11

ethene is used as it stimulates conversion of starch to sucrose

Question 12

seedless fruit

Answer 12

if auxin is applied on an unpollinated plant, the plant will grow no seeds

Question 13

control dormancy

Answer 13

you can wait until you want to grow it by using gibberellins and auxin