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Phanerogams - Division I-Gymnosperms

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Topics

Gymnosperms:

Aspect Details
Nature of Plants Mostly evergreen, perennial, and woody plants with unbranched stems and a crown of leaves.
Reproductive Structures Male and female reproductive structures are borne on separate sporophylls of the same plant. Reproductive structures are unisexual.
Seed Features Seeds are exposed and lack a natural covering; hence, no fruits are formed (gymnos = naked, sperms = seeds).
Examples
  • Cycas: palm-like appearance with large compound leaves.
  • Picea: (Christmas tree) Pyramid-shaped conifer.
  • Thuja: ornamental plant with scale-like leaves.
  • Pinus: large, cone-bearing trees in colder regions.
Preferred Environment Found in temperate and cold climates, including forests and mountainous regions.
Pollination and Fertilization Wind-based pollination: seeds form after fertilisation, but fruits do not develop.
Role in Ecosystems Contribute to oxygen production, provide habitats, and prevent soil erosion.
Economic Value Source of timber, resin, and medicinal compounds.
Historical Significance Ancient plant group that evolved before angiosperms, showcasing early adaptations in plant evolution.
 
 
Gymnosperms

Activity

Comparing Garden Plants:

1. Observe plants like Cycas, Christmas tree (Picea), hibiscus, and lily in a garden.

2. Note their similarities, such as being green and autotrophic, and differences in structure and reproduction.

3. Identify differences between gymnosperms (e.g., Cycas, Christmas tree) and angiosperms (e.g., Hibiscus, lily):

  • Gymnosperms have exposed seeds and no fruits, while angiosperms produce seeds that are enclosed in fruits.
  • Gymnosperms are mostly woody and evergreen, whereas angiosperms can be woody, herbaceous, or deciduous.
  • Gymnosperms have separate male and female reproductive structures, while angiosperms often have flowers with both male and female parts.
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Video Tutorials

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Shaalaa.com | Gymnosperms: characteristics, example, structure

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Gymnosperms: characteristics, example, structure [00:09:41]
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