Chapter 5A Flashcards
What is auxin?
This is a hormone that is produced in the apical meristem of plants and causes plant growth or the elongation of cells.
What is gibberlin?
This is a hormone that also stimulated plant growth and elongation of stems.
What is the problem caused by an abundance of gibberlin?
Lodging
What are cytokinins?
These are hormones that enhance growth and stop the plant from aging.
What are ethylenes?
These are gaseous hormones that regulate responses such as aging.
Why do you put bananas in a bag?
To retain the ethylene gas and lead to fruit ripening.
What are brassinosteroids?
These are hormones that regulate plant growth.
What does ABA do?
Other than closing the stomata it suppresses plant growth.
What are jasmonates?
These are hormones that cause a bitter taste to plants and lead to regulation of growth.
What is auxin?
This is a hormone synthesized in the shoot apical meristem and young stems and leaves and promotes cell elongation and growth in response to blue light and gravity.
How does the acid-growth hypothesis or cell expansion work?
1.) H+ are actively pumped out of the cytoplasm to the cell wall
2.) Cell expansion occurs
3.) The celulose in the cell wall breaks down slightly
In response to blue light what happens to the plant due to auxin?
The plant bends closer to the light because the cell elongation occurs in part of the plant that is opposite to the light.
What is bolting?
This is the development of enlarged fruit or elongated flower stems due to gibberlin.
What is potato blight?
The pathogen phytophthora is what killed 1 million people in Ireland due to the breakdown of the leaves.
What is the hypersensitive response?
This is the break down of plants due to pathogens however if a leaf is infected it initiates an immune response in the neighbouring leaves to provide resistance against the disease.
