Plant Hormones Flashcards
(28 cards)
What are the three closely related events in the life of a plant?
Growth, differentiation, and development
How is development in plants broadly considered?
As the sum of growth and differentiation
What are the two types of factors that control development in plants?
- Intrinsic factors (genetic, intercellular chemicals)
- Extrinsic factors (light, temperature, water, oxygen, nutrition)
What are plant growth regulators (PGRs)?
Small, simple molecules of diverse chemical composition
Name a type of indole compound that is a plant growth regulator.
Indole-3-acetic acid (IAA)
What are the two groups of plant growth regulators based on their functions?
- Growth promoting activities
- Growth inhibiting activities
Give examples of plant growth promoters.
- Auxins
- Gibberellins
- Cytokinins
What role do PGRs in the second group play?
Involved in plant responses to wounds and stresses, and growth inhibiting activities
Which plant growth regulator is primarily associated with growth inhibition?
Abscisic acid (ABA)
What is the gaseous plant growth regulator that can fit into both growth promoting and inhibiting categories?
Ethylene
Who were the first to observe phototropism in canary grass?
Charles Darwin and his son Francis Darwin
What was concluded about the coleoptile tip in relation to auxin?
It is the site of transmittable influence causing bending towards light
Who isolated auxin from the tips of coleoptiles of oat seedlings?
F.W. Went
Fill in the blank: Development in plants is controlled by _______ and _______ factors.
[intrinsic] and [extrinsic]
What are the three closely related events in the life of a plant?
Growth, differentiation, and development
How is development in plants broadly considered?
As the sum of growth and differentiation
What are the two types of factors that control development in plants?
- Intrinsic factors (genetic, intercellular chemicals)
- Extrinsic factors (light, temperature, water, oxygen, nutrition)
What are plant growth regulators (PGRs)?
Small, simple molecules of diverse chemical composition
Name a type of indole compound that is a plant growth regulator.
Indole-3-acetic acid (IAA)
What are the two groups of plant growth regulators based on their functions?
- Growth promoting activities
- Growth inhibiting activities
Give examples of plant growth promoters.
- Auxins
- Gibberellins
- Cytokinins
What role do PGRs in the second group play?
Involved in plant responses to wounds and stresses, and growth inhibiting activities
Which plant growth regulator is primarily associated with growth inhibition?
Abscisic acid (ABA)
What is the gaseous plant growth regulator that can fit into both growth promoting and inhibiting categories?
Ethylene
