16.5 Commercial Use of Plant Hormones

Question 1

How can weedkiller be made using synthetic plant hormones?

Answer 1

auxin applied

more auxin absorbed by broad-leafed weeds than narrow plants due to higher surface area

causes unsustainable growth in weeds, use up energy stores & die out

Question 2

What is the commercial use of ethene?

Answer 2

ripens fruit by increasing rate of respiration reactions

(fruit is unripe when transporting, ripened during arrival)

causes fruit to fall

Question 3

How can auxins act as rooting powders?

Answer 3

Auxin stimulates growth of new roots when applied to cut shoot

Question 4

What plant hormone causes the production of seedless fruit?

Answer 4

auxins

Question 5

What plant hormone prevents ripe fruit from ageing & control tissue development during propagation?

Answer 5

cytokinins

Question 6

What plant hormone delays ripening/ageing of fruit?

Answer 6

gibberellins

Question 7

What plant hormone is used to prevent ageing in ripe fruit?

Answer 7

cytokinins