Plant Hormones

Question 1

Shoots

Answer 1

Positively phototropic
Auxins move to the shaded side of the shoot causing cell elongation which causes the shoot to bend towards the light

Question 2

Roots

Answer 2

Positive gravitropism
Auxins collect in large amounts on the underside of the root, inhibiting cell elongation, causing the root to grow downwards in the direction of gravity

Question 3

Auxins in commercial use

Answer 3

Selective weed killers - overgrowth of large leaf plants, not small leaf crops

Question 4

Gibberellins in commercial use

Answer 4

Larger fruit - increases yield, more profit
Fruit without seeds - more profit

Question 5

Ethene in commercial use

Answer 5

Stimulates fruit ripening - fruit can be shipped and then ripened in supermarkets