seed producing plants

Introduction to Seed Producing Plants

• Two major classifications of seed-producing plants:

  • Gymnosperms

  • Angiosperms

• Botanical term for seed-producing plants: Spermatophytes

Overview of Seed Development

• All plants reproduce by producing an embryo.

• Every embryo has a food source to enhance survival after detachment from the parent plant.

• Differences in embryo food sources between gymnosperms and angiosperms.

Gymnosperms

• Definition: Nonflowering plants with naked seeds.

• Terminology: "Gymnosperm" derives from Greek word "gymnome" meaning naked, combined with "sperm" meaning seed.

• Characteristics:

  • Seeds are often carried on surfaces like cones or scales, rather than flowers.

  • Example: Conifers (e.g., pines) that produce cones, not flowers.

  • An ovule is the unfertilized state of a seed, which eventually becomes a seed after fertilization.

  • Ginkgo biloba as an example with stalks developing seeds at their ends.

Angiosperms

• Definition: Flowering plants that produce enclosed seeds.

• Characteristics:

  • Largest and most diverse group of plants.

  • Seeds protected inside a flowering structure, called a fruit after fertilization.

• Fruits in Botany:

  • Botanical definition may differ from common definitions; any enclosure surrounding the seed qualifies as a fruit, regardless of typical soft or juicy characteristics.

  • Importance of understanding various types of fruits for identification and classification.

Conclusion

• Understanding the differences between gymnosperms and angiosperms is essential for plant classification.

• Focus on angiosperms due to their prevalence and diversity in the plant kingdom.