Botany Study Notes

Botany Overview

  • Study of plants: structure, growth, reproduction, physiology.
  • Branches include Morphology, Anatomy, Physiology, Taxonomy, Ecology.

Plant Morphology

  • Roots: Anchors plant, absorbs water & nutrients.
  • Stems: Support, transport water and food.
  • Leaves: Photosynthesis, regulates water loss.
  • Flowers: Reproductive structures.
  • Fruits: Mature ovaries containing seeds.

Flower Anatomy

  • Stamen: Male part (anther & filament).
  • Pistil: Female part (ovary, style, stigma).
  • Receptacle, Petal, Sepal, Pedicel: Structural roles.

Leaf Anatomy

  • Blade: Main photosynthesis site.
  • Veins: Transport system for water and nutrients.
  • Midrib, Margin, Apex, Base, Petiole: Structural features.
  • Cuticle & Stomata: Water regulation and gas exchange.

Root Anatomy

  • Root Cap: Protects root tip.
  • Root Hairs: Increase surface area for absorption.

Plant Anatomy

  • Cells have cell walls, chloroplasts, and vacuoles.
  • Tissues: Meristematic (growth) and Permanent (function).
    • Meristematic: Primary (apical), secondary (lateral), intercalary growth.
    • Permanent: Simple (one cell type) and Complex (multiple cell types for transport).

Plant Physiology

  • Study of plant function at cellular and molecular levels.
  • Key areas: Photosynthesis, Respiration, Reproduction, Growth, Hormones.

Photosynthesis

  • Converts light energy to chemical energy (sugars).
  • Occurs in chloroplasts, involves light-dependent (in thylakoids) and light-independent reactions (Calvin Cycle in stroma).

Respiration

  • Converts glucose to energy (ATP) through Glycolysis, Krebs Cycle, and Electron Transport Chain.

Plant Reproduction

  • Asexual: Fragmentation, vegetative propagation, apomixis (offspring genetically identical).
  • Sexual: Involves gamete fusion, pollination, fertilization, seed dispersal.

Growth and Development

  • Growth: Size increase through cell division and elongation.
  • Development: Differentiation into specialized organs.
  • Factors: Environmental (light, temperature), Hormonal (auxins, gibberellins), Genetic.

Plant Responses

  • Tropisms: Growth responses to stimuli (e.g., phototropism to light).
  • Types include Hydro-, Gravi-, Thigmo-, Chemotropism.