Ms. Frost  A world of biology.....
  • Welcome
    • About me
    • IB Calendar
  • IB: Introduction to cells
    • Origin of Cells
    • Membrane Structure and transport
    • Cell division
    • Structure of DNA and RNA
    • DNA Replication
    • Transcription and gene expression
    • Translation
  • Molecules to Metabolism
    • Molecular diagrams
    • Water
    • Carbohydrates and Lipids
    • Proteins and Enzymes
    • Lactase / Enzyme Inhibition
    • Cellular Respiration
    • Phases of Cellular Respiration
    • Earth atmosphere / Color
    • Photosynthesis
  • Digestion and absorption
    • The kidney and osmoregulation
    • Neurons and synapses
    • Muscle and Movement
    • The blood system
    • Gas exchange
    • Defense against infectious disease
    • Antibody production and vaccination
    • Hormones, Homeostasis
    • Sexual reproduction
  • Genetic modification and biotechnology
  • Genetics and Genes
    • Chromosomes
    • Meoisis
    • Inheritance
    • MORE Inheritance
  • Evidence of evolution
    • Natural selection
    • Gene pools and speciation
    • Classification of biodiversity
    • Cladisitics
  • Ecology Species, communities and ecosystems
    • Energy Flow
    • Carbon Cycling
    • Climate change
  • Option C: Species and communities
    • Option C: Communities and ecosystems
    • Option C: Impacts of human on ecosystems
    • Option C: Conservation of biodiversity
  • Plants: Transport in the xylem of plants
    • Transport in the phloem of plants
    • Growth in plants
    • Reproduction in plants
  • Anatomy Language
    • Epithelial/Connective/Skeletal
    • Muscular / Nervous Tussue
    • Heart
  • Western Hills Website
  • Science in the News
  • World Population Clock
  • Pre AP Biology

Growth in plants

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Growth

Understandings:
• Undifferentiated cells in the meristems of plants allow indeterminate growth.

• Mitosis and cell division in the shoot apex provide cells needed for extension of the stem and development of leaves.

• Plant hormones control growth in the shoot apex.
Plant growth and adaptations

Tropisms

Plant shoots respond to the environment by tropisms.Click below and click on Exploring Plant Responses to see how tropism works​.
Experimenting with tropisms!
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Auxin

Auxin efflux pumps can set up concentration gradients of auxin in plant tissue.

• Auxin influences cell growth rates by changing the pattern of gene expression.

Applications and skills:
• Application: Micropropagation of plants using tissue from the shoot apex, nutrient agar gels and growth hormones.

• Application: Use of micropropagation for rapid bulking up of new varieties, production of virus-free strains of existing varieties and propagation of orchids and other rare species.

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