angiosperms and gymnosperms
Angiosperms and Gymnosperms
Angiosperms and gymnosperms are classifications of plants that have different characteristic properties. Their distinct features form the basis of their classification. Read on to know the details.
- They are capable of producing pollen for fertilization, which is siphonogamous, i.e., through a pollen tube. Gymnosperms mostly depend on wind pollination, and some angiosperms are also dependent on the same agent.
- The sporophyte of both these varieties is differentiated into root, stem, and leaves.
- Apart from primary growth, their stem also undergoes expansion by secondary growth.
- Like angiosperms, gymnosperms also have vessels and companion cells. The vascular system is common for the both of them, consisting of conjoint and vascular bundles (open and collateral).
- The ovules of both angiosperms and gymnosperms develop into seeds. Their mode of seed germination is epigeal, hypogeal, or both.
- One distinct similarity is the reduced gametophytic phase of both plants.
- Polyembryony, a common feature of gymnosperms, is also prevalent in some angiosperms and a suspensor is formed during the embryo development phase.
- Coniferophyta
- Cycadophyta
- Ginkgophyta
- Gnetophyta
- Angiosperms are of a much more varied type than gymnosperms. They can be trees, herbs, and shrubs, while gymnosperms are mostly woody trees.
- The typical structure of flowering plants consisting of ovary, style, and stigma is absent in gymnosperms, is an important aspect of angiosperms.
- Angiosperms have companion cells and xylem vessels in them, but these features are only present in Gnetales, a particular class of gymnosperms.
- Gymnosperms have unisexual flowers, while the other group bear flowers that are mostly bisexual.
- The endosperm formed in gymnosperms is a haploid tissue, while it's triploid in angiosperms. This is because double fertilization and triple fusion are absent in the former category, as a result the endosperm is formed before fertilization; while in the latter, the endosperm is the product of a triple fusion.
- Occurrence of a free nuclear division is present in angiosperm, but is absent in the other type.
- Female gametophyte, known as archegonia, is clearly distinct in gymnosperms, whereas it is absent in angiosperms.
- In angiosperms, the pollen receptive structures are mostly ovules, so they do not have to depend on external agents for pollination; while gymnosperms rely on natural agents.
- Redwood
- Fir
- Cypress
- Juniper
- Yew
- Ephedra
- Ginkgo
- Spruce
- Welwitschia
- Conifers
- Cycads
- Ginkgophyta
- Gnetum
- Pine
- Bluebells
- Cucumber
- Tomato
- Oranges
- Marigold
- Lemon
- Peapod
- Walnut
- Raspberry
- Strawberry