Q5a-Plant Hormones

Question 1

How does auxin (IAA) move through plants?

Answer 1

via slow, unidirectional movement through parenchyma cells

Question 2

What are some of auxin’s actions?

Answer 2

All of the other options (except the none options) are actions of auxin

Question 3

How does certain leaf-miner caterpillars prolong their food source by maintaining ‘green islands’ in senescent autumn leaves?

Answer 3

By causing extra cytokinin to be produced

Question 4

What part of the plants produce cytokinis?

Answer 4

Root tips

Question 5

If a callus growth in tissue culture is subject to high levels of cytokine relative to auxin___ will develop

Answer 5

Stem & Leaves

Question 6

How could a west Texas farmer defoliate his mature cotton crop in order to prepare it for harvest?

Answer 6

By using an herbicide or chemical agent that causes plants to produce ethylene is response to the injury

Question 7

How many guards cells in a leaf close stomata (by reducing turgor pressure) even in cases where the rest of the plants is not wilting and still adequate turgor?

Answer 7

By responding to an increase in ABA

Question 8

Rice plants infected with the fungus that causes foolish seedling disease, tall, spindly, and weak because of too much…

Answer 8

Gibberellin

Question 9

A class of growth-promoting steroids in plants are…

Answer 9

Brassinosteroids

Question 10

Ethylene, along with a substance known as Jasmonate can help trigger a plant’s response to…

Answer 10

Infection by neurotrophic pathogens

Question 11

When a seed germinates or a bud breaks dormancy and begins to grow in the Spring, this means that gibberellin and other hormones & factors have overcome the action of….

Answer 11

ABA