Characteristics of angiosperms

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Characteristics of Angiosperms (Flowering Plants)

1. Presence of Flowers

   • Angiosperms produce flowers, which are the reproductive structures.

2. Seeds Enclosed in Fruits

   • Seeds develop inside the ovary, which matures into a fruit.

3. Double Fertilization

   • Unique to angiosperms: one sperm fuses with the egg (zygote), the other with polar nuclei (endosperm).

4. Vascular System Well Developed

   • Contains true xylem (with vessels) and phloem (with companion cells) for efficient transport.

5. Presence of True Roots, Stems, and Leaves

   • All plant organs are well differentiated and specialized.

6. Ovules Enclosed in Ovary

   • Unlike gymnosperms, the ovules are not exposed but protected inside an ovary.

7. Pollination Mechanisms Diverse

   • Can be wind, water, insect, bird, or animal-pollinated depending on species.

8. Lifecycle Shows Alternation of Generations

   • Dominant sporophyte generation; highly reduced, dependent gametophyte.

9. Rapid Life Cycle

   • Compared to gymnosperms, angiosperms grow, reproduce, and mature quickly.

10. Fruit Formation

• Ovary converts into fruit after fertilization, aiding seed dispersal.

11. Broad Diversity

• Largest plant group (~300,000 species); includes herbs, shrubs, trees, and climbers.

12. Monocots and Dicots Classification

• Based on seed leaves (cotyledons):
  • Monocots: 1 cotyledon, parallel venation, fibrous roots.
  • Dicots: 2 cotyledons, reticulate venation, taproot system.

13. Highly Specialized Reproductive Structures

• With stamens (male) and carpels (female), often arranged in attractive, colorful flowers.

14. Adaptability to Various Habitats

• Found in deserts, aquatic systems, tropical forests, and temperate zones.

15. Endosperm Formation

• Provides nourishment to the developing embryo; formed only after fertilization.