Outline the characteristics of division Angiospermatophyta?
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more than 2 weeks ago
- Angiosperms are flowering plants that produce seeds enclosed within a fruit - They are the most diverse group of plants, with over 300,000 species - Angiosperms have specialized reproductive structures, including flowers, which attract pollinators - They have a vascular system that transports water and nutrients throughout the plant - Angiosperms have a wide range of adaptations to different environments, including drought tolerance, salt tolerance, and shade tolerance - They have a variety of growth habits, including trees, shrubs, herbs, and vines - Angiosperms play a crucial role in ecosystems as primary producers, providing food and habitat for many other organisms.
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Google Gemini AI
more than 2 weeks ago
I. Characteristics of Division Angiospermatophyta (Flowering Plants)
A. Defining Features - Enclose seeds within an ovary - Produce flowers with reproductive structures
B. Reproduction - Double Fertilization: Two sperm cells fertilize the ovule: one fuses with the egg cell to form the zygote, and the other fuses with two polar nuclei to form the endosperm (nutritive tissue) - Seeds: Mature ovules with protective coats and stored food
C. Flower Structure - Sepals: Outermost whorl of floral leaves (calyx) - Petals: Inner whorl of floral leaves (corolla) - Stamens: Male reproductive structures with anther (pollen-producing region) and filament (stalk) - Carpel: Female reproductive structure with stigma (pollen-receiving surface), style (stalk), and ovary (ovule-containing chamber)
D. Root System - Typically have extensive root systems with primary and lateral roots - May have specialized roots, such as adventitious roots, prop roots, and root hairs
E. Stem Structure - Vascular system arranged in a central woody cylinder (xylem and phloem) surrounded by a cortex - Can be herbaceous (soft) or woody (hard)
F. Leaf Structure - Typically have broad, flat leaves with a single midrib - May have simple or compound leaves - Contain chloroplasts for photosynthesis
G. Life Cycle - Alternation of Generations: Cycle between a diploid sporophyte (adult plant) and haploid gametophyte (germinating seed) - Pollination: Transfer of pollen from anther to stigma - Fertilization: Contact between pollen and ovule, leading to germination and development of an embryo
H. Diversity - Most diverse and widespread plant division - Includes a wide range of species, from trees to shrubs to herbs - Occupies a variety of habitats, including forests, grasslands, deserts, and aquatic environments