9 Questions
What is the primary characteristic of tropisms in plants?
They are irreversible and permanent
Which type of tropism is responsible for a plant's growth response to light?
Phototropism
What is the primary function of plant hormones in regulating plant growth and development?
Regulating cell growth and division
Which of the following plant hormones is involved in regulating fruit growth and development?
Auxin
What is the primary characteristic of auxins in terms of their production and transport?
Produced in shoot apices and transported to roots
Which of the following is NOT a function of auxins in plants?
Producing flowers and seeds
What is the primary role of geotropism in plant growth and development?
Responding to gravity
Which of the following is a characteristic of tropisms in specific regions of the plant?
They occur in specific regions of the plant (e.g. shoot apex, root tip)
What is the primary function of chemotropism in plants?
Responding to chemicals
Study Notes
Tropisms
- Definition: Directional growth responses in plants to environmental stimuli
- Types of tropisms:
- Phototropism: growth response to light
- Geotropism: growth response to gravity
- Hydrotropism: growth response to water
- Thigmotropism: growth response to touch
- Chemotropism: growth response to chemicals
- Characteristics:
- Tropisms are irreversible and permanent
- Tropisms occur in specific regions of the plant (e.g. shoot apex, root tip)
- Tropisms involve changes in cell elongation and cell division
Hormone Regulation
- Definition: Hormones are chemical messengers that regulate plant growth and development
- Types of plant hormones:
- Auxins
- Gibberellins
- Cytokinins
- Ethylene
- Abscisic acid
- Functions of plant hormones:
- Regulating cell growth and division
- Controlling tropisms
- Influencing root-shoot development
- Regulating flowering and seed production
- Responding to stress and environmental stimuli
Auxin Function
- Definition: Auxins are a class of plant hormones that promote cell elongation and cell division
- Functions of auxins:
- Regulating cell growth and differentiation
- Controlling apical dominance
- Promoting root growth and development
- Influencing tropisms (e.g. phototropism, geotropism)
- Regulating fruit growth and development
- Characteristics of auxins:
- Produced in shoot apices and transported to roots
- Involved in vascular tissue differentiation
- Regulated by environmental factors (e.g. light, temperature)
- Interact with other plant hormones to coordinate plant growth and development
Tropisms
- Directional growth responses in plants to environmental stimuli
- Types of tropisms:
- Phototropism: growth response to light
- Geotropism: growth response to gravity
- Hydrotropism: growth response to water
- Thigmotropism: growth response to touch
- Chemotropism: growth response to chemicals
- Characteristics of tropisms:
- Irreversible and permanent
- Occur in specific regions of the plant (e.g. shoot apex, root tip)
- Involve changes in cell elongation and cell division
Hormone Regulation
- Hormones are chemical messengers that regulate plant growth and development
- Types of plant hormones:
- Auxins
- Gibberellins
- Cytokinins
- Ethylene
- Abscisic acid
- Functions of plant hormones:
- Regulating cell growth and division
- Controlling tropisms
- Influencing root-shoot development
- Regulating flowering and seed production
- Responding to stress and environmental stimuli
Auxin Function
- Auxins are a class of plant hormones that promote cell elongation and cell division
- Functions of auxins:
- Regulating cell growth and differentiation
- Controlling apical dominance
- Promoting root growth and development
- Influencing tropisms (e.g. phototropism, geotropism)
- Regulating fruit growth and development
- Characteristics of auxins:
- Produced in shoot apices and transported to roots
- Involved in vascular tissue differentiation
- Regulated by environmental factors (e.g. light, temperature)
- Interact with other plant hormones to coordinate plant growth and development
Test your knowledge of plant tropisms, including phototropism, geotropism, and more, and how they respond to environmental stimuli.
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