Topic 5 Commercial Uses Of Plant Hormones

Question 1

What can auxins be used for

Answer 1

Killing weeds
growing from cuttings with rooting powder
growing cells in tissue culture

Question 2

What is the difference between most weeds and crops

Answer 2

Weeds are broadleaved wild grasses and cereals have narrow leaves

Question 3

How is auxins been developed to kill weeds

Answer 3

Selective weed killers have been developed using auxins which only affect broad leaf plants
they destruct their normal growth patterns which soon kills them was leaving the grass and crops untouched 

Question 4

What is a cutting

Answer 4

Part of a plant has been cut off but the end of a brand with a few leaves on it

Question 5

What should you add to get cuttings to grow

Answer 5

Rooting powder which contains auxins
they will produce roots rapidly and start growing as new plants and enables growers to produce lots of clones of a really good plant quickly

Question 6

What can tissue cultures be used for

Answer 6

Grow clones of a plant from a few cells
using hormones such as auxins that need to be added to the growth medium along with nutrients to stimulate the cells to divide to form both roots and shoots

Question 7

What is Gibberellin

Answer 7

A type of plant growth hormone that stimulates seed germination, stem growth and flowering

Question 8

What can gibberellin be used for

Answer 8

Controlling dormancy
inducing flowering
growing larger fruit

Question 9

What happens to seeds treated with Gibberellin 

Answer 9

Alters the dormancy and makes of germinate at times of the year they wouldn’t normally
and make sure all the seeds in a batch Germinate at the same time

Question 10

How is gibberellin used for inducing flowers

Answer 10

If treated flour without any change in the environment and can be used to grow bigger flowers

Question 11

How is gibberellin used to grow larger fruit

Answer 11

Added to seedless varieties of fruit to make them grow larger to match normal types

Question 12

What does gibberellins stimulate

Answer 12

Plants Stems to grow

Question 13

What does Ethene stimulate

Answer 13

Ripening of fruit

Question 14

What is Ethene produce from

Answer 14

A gas produced by ageing parts of a plant

Question 15

What does Ethene influence

Answer 15

The growth of a plant by controlling cell division
also stimulate enzymes that cause a fruit ripen

Question 16

What can Ethene be used for commercially

Answer 16

To speed up the ripening of fruits on the plant or during transport to the shops

Question 17

What does the use of ethene mean

Answer 17

That fruit can be picked while it’s not ripe and is firm so less easily damaged
and can be made ripe on the way to the supermarket

Question 18

How can ripening be delayed

Answer 18

By adding chemicals that block Ethene’s affect on the fruit or reduce the amount of ethene that the fruit can produce
some chemicals can be used to react with ethene to move it from the Air