Plant Hormones

Question 1

Auxins

Answer 1

Change growth patterns to allow roots and shoots to move towards or away from a stimulus

Respond to stimuli which involve directional growth called tropisms

Question 2

Gibberellins

Answer 2

Start seed germination ( sprouting) process

Question 3

Ethene

Answer 3

Gass that controls cell division and ripening if fruits

Question 4

Tropisms

Answer 4

Controlled by auxins

There’s 2 types

Phototropisms:

Positive phototropisms - these responses involve growing directly towards a light source

Negative phototropisms - these responses involve growth away from a light source

Gravitropisms:

Positive gravitropisms - involve growth towards the direction of gravity

Negative gravitropisms - involve growth away from direction or gravity

Question 5

Distribution of auxins and phototropisms

Answer 5

1 side of the shoot has more sunlight

Auxins redistribute within the shoot so the concentration of auxins is higher on the shaded side, resulting in more growth on the shaded side

Question 6

Auxins in shoots vs roots

Answer 6

Shoots = auxins promote elongation of cells

Roots = auxins prevent elongation of cells

Question 7

What are auxins used for

Answer 7

Weed killers

Rooting powders and to promote growth in tissue culture

Question 8

What is ethane used for

Answer 8

Used in food industry to control ripening of fruit during storage and transport

Question 9

What are gibberelins used for

Answer 9

Promoting flowering

Increasing fruit size

Starting germination