Study Notes
Growth in plants involves meristems, which are tissues with undifferentiated cells allowing for indeterminate growth. Plant hormones like auxins play a crucial role in directing growth and development.
- Meristems — tissues in plants with undifferentiated cells capable of growth. Example: Apical meristems at shoot tips enable primary growth.
- Apical Meristems — occur at shoot and root tips, responsible for primary growth. Example: Lengthening of the plant.
- Lateral Meristems — occur at the cambium, responsible for secondary growth. Example: Thickening of the plant.
- Auxins — plant hormones affecting growth and development. Example: Auxins promote root and shoot growth.
- Phototropism — growth movement in response to light. Example: Shoots growing towards a light source.
- Geotropism — growth movement in response to gravity. Example: Roots growing downward into the soil.
- Micropropagation — technique to produce large numbers of identical plants. Example: Used for virus-free plant production.
Exam Tips
Key Definitions to Remember
- Meristems
- Apical Meristems
- Lateral Meristems
- Auxins
- Phototropism
- Geotropism
- Micropropagation
Common Confusions
- Difference between apical and lateral meristems
- How auxins can both promote and inhibit growth
Typical Exam Questions
- What is the role of meristems in plant growth? Meristems contain undifferentiated cells that allow for indeterminate growth.
- How do auxins influence plant growth? Auxins affect growth by promoting or inhibiting cell elongation and influencing gene expression.
- What is micropropagation and its use? Micropropagation is a technique to produce identical plants rapidly, used for virus-free strains and rare species.
What Examiners Usually Test
- Understanding of primary and secondary growth
- Role of hormones in plant growth
- Application of micropropagation techniques