2.6 Hormones and the Control of Plant Growth

Question 1

Where do shoots grow towards and what is this process called?

Answer 1

Shouts grow toward the light, called phototropism

Question 2

Where do roots grow and what is that called?

Answer 2

Roots grow towards gravity, called gravitropism. Roots also grow towards water

Question 3

What is auxin?

Answer 3

The hormone that controls phototropism and gravitropism

Question 4

Name 3 things plants are sensitive to?

Answer 4

• light
• gravity
• moisture

Question 5

Name 5 uses of plant hormones

Answer 5

• agriculture
• horticulture
• weed killer
• stimulate root growth
• encourage fruit to ripen

Question 6

What can unequal distributions of auxin lead to?

Answer 6

Unequal growth of the plant, it will bend to one side

Question 7

Who uses plant hormones?

Answer 7

Farmers and gardeners

Question 8

Why is it important to use plant hormones correctly in agriculture?

Answer 8

If used incorrectly, plant hormones can cause damage to the environment, ex weed killers may kill more useful plants

Question 9

What is the relationship between the amount of auxin on one side and the amount of growth on that side in plant roots?

Answer 9

The root grows more on the side with the least auxin

Question 10

What is the relationship between the amount of auxin on one side and the amount of growth on that side in plant shoots?

Answer 10

The shoot grows more on the side with the most auxin

Question 11

What happens when auxin gathers on the lower side of a root? What does this cause?

Answer 11

The upper side grows more, causing it to grow downwards and towards gravity

Question 12

What happens when auxin gathers on the lower side of a shoot? What does this cause?

Answer 12

The lower side grows more, causing it to grow upwards towards the light