Flowering PlclassMGH

Structure and Function of Flowering Plants

General Overview

• Course: General Biology II

• Instructor: Dr. Eileen Walsh

Topics Covered

• Structure and Growth of Flowering Plants

• Transport Mechanisms in Flowering Plants

• Reproductive Processes in Flowering Plants

• Response and Control Mechanisms in Flowering Plants

Transport in Flowering Plants

Essential Plant Nutrients

• Water, Gases, Minerals: Main components

• Macronutrients: e.g., Nitrogen, Phosphorus, Potassium

• Micronutrients: e.g., Iron, Zinc

Mechanisms of Transport

• Xylem: Transports water and nutrients upward

• Phloem: Distributes organic substances

Reproduction in Flowering Plants

Asexual Reproduction

• Involves modifications of roots, stems, and leaves (e.g., rhizomes, tubers)

Sexual Reproduction

• Alternation of Generations: Involves sporophyte (diploid) and gametophyte (haploid) generations

Flower Structure

• Components include sepals, petals, stamens, and carpels

• Double Fertilization Process: Sperm fertilizes egg to form zygote and fuses with polar nuclei to form endosperm

Response and Control in Plants

Plant Hormones

• Auxins: Promote cell elongation, phototropic responses

• Gibberellins: Stimulate stem elongation and seed germination

• Cytokinins: Promote cell division and delay aging

• Ethylene: Regulates fruit ripening and leaf abscission

• Abscisic Acid: Inhibits growth, promotes dormancy, regulates stomata through environmental cues

Tropisms

• Phototropism: Growth in response to light

• Thigmotropism: Growth in response to touch

• Geotropism: Growth in response to gravity

Conclusion

• Understanding the structure and functions of flowering plants is crucial for comprehending their growth, transport mechanisms, reproduction, and environmental responses.