Study Notes from Dr. Faten Filimban's Lectures on Plant Biology

Photosynthesis

  • Photosynthesis converts CO2 + H2O + sunlight into carbohydrates (C6H12O6) + O2.

Role of Plants

  • Plants are primary producers in the food chain, capable of making their own food.

Plant Responses to Environment

  • Plants can perceive colors, touch, smell, time, gravity, and even generate heat.

Botany Definition

  • Botany is the natural science of studying plants, also known as plant science or plant biology.

Branches of Plant Science

  1. Morphology: Study of physical forms and external structures.
  2. Anatomy: Study of internal structures.
  3. Ecology: Study of plant-environment relationships.
  4. Taxonomy: Classification and naming of plants.
  5. Physiology: Study of plant functions and processes.
  6. Cytology: Study of plant cells.
  7. Genetics: Study of hereditary information in plants.
  8. Phytopathology: Study of plant diseases.
  9. Economic Botany: Study of plants' economic importance to humans.
  10. Bryology: Study of mosses and liverworts.
  11. Palaeobotany: Study of plant fossils.
  12. Pteridology: Study of ferns.

Basic Plant Structure

  • Composed of roots, stems, leaves, and flowers.

Plant Body Sections

  1. Root system: Anchors the plant and absorbs nutrients.
  2. Shoot system: Includes stems, leaves, flowers, and fruits.

Root Development

  • Begins from the radicle post-germination; consists of taproot in dicots and fibrous roots in monocots.

Seed Structure

  • Consists of embryo, cotyledons, and endosperm for nourishment.

Seed Germination Conditions

  • Requires water, suitable temperature, oxygen, active embryo, and possibly external stimulating factors.

Types of Germination

  1. Hypogeal: Cotyledons remain underground (e.g., Vicia faba).
  2. Epigeal: Cotyledons emerge above ground (e.g., bean).

Reproductive Parts

  • Flowers are reproductive organs; fruits develop as a mature ovary, containing seeds.

Pollination

  • Process of transferring pollen from anther to stigma, can be self or cross-pollination.

Types of Fruits

  • Simple, aggregate, and multiple fruits based on their development.

Asexual Reproduction

  • Involves cloning; types include cuttings, offsets, layering, grafting, and specialized vegetative structures like bulbs and rhizomes.

Plant Tissues

  1. Meristematic Tissues: Capable of division, responsible for growth.
  2. Permanent Tissues: Do not divide, specialized functions include:
    • Epidermis: Protective layer.
    • Parenchyma: Storage and photosynthesis.
    • Collenchyma: Support and flexibility.
    • Sclerenchyma: Strength, contains lignin.
    • Vascular tissues (Xylem and Phloem): Conduct water/nutrients and sugars.

Secondary Growth

  • Occurs in dicots, resulting in increased thickness due to vascular cambium activity.

Adaptive Structure of Plants

  • Plants adapt to environments (e.g., xerophytes in deserts vs. hydrophytes in aquatic settings).

Plant Anatomy

  • Understanding of root, stem, and leaf anatomy provides insights into their functions and adaptations.