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Angiosperms
Angiosperms are the most diverse group of flowering seed-producing land plants. They have key characteristics including ovules enclosed in a carpel structure made of an ovary and stigma, double fertilization leading to endosperm formation, stamens with two pairs of pollen sacs, and phloem tissue composed of sieve tubes and companion cells. The parts of an angiosperm include roots that absorb water and nutrients underground, various stem types like stolons and rhizomes, and leaves that can be simple or compound and arranged alternately, opposite, or whorled on the stem. Angiosperms are divided into monocots and dicots based on whether their seeds have one or two coty
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Angiosperms
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- 2. What are Angiosperms??? •The flowering plants (angiosperms), also known as Angiospermae or Magnolio phyta, are the most diverse group of land plants. Angiosperms are seed-producing plants .
- 3. Parts Of Angiosperms •The parts of an Angiosperm include: • Roots, which are generally underground and serve to absorb water and nutrients • Stems, which come in various types such as: – stolon, an above-ground “runner” – rhizome, an underground “runner” – bulb, a fleshy stem modified for nutrient storage • Leaves, which can be either simple or compound in form and which alternate with each other going up the stem or can be arranged opposite each other on the stem or as whorled leaves where more than two originate from the same place on the stem
- 4. Characteristics Of Angiosperms •Despite their diversity, angiosperms are clearly united by a suite of synapomorphies (i.e., shared, derived features) including: • 1) ovules that are enclosed within a carpel, that is, a structure that is made up of an ovary, which encloses the ovules, and the stigma, a structure where pollen germination takes place, • 2) double fertilization, which leads to the formation of an endosperm (a nutritive tissue within the seed that feeds the developing plant embryo), • 3) stamens with two pairs of pollen sacs, • 4) features of gametophyte structure and development, and • 5) phloem tissue composed of sieve tubes and companion cells
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- 6. Cotyledons • Plant embryosin seeds have structures called cotyledons. Cotyledons are called ‘seed leaves’ because in many instances they emerge and become green when the seed germinates.
- 7. Division Of Angiosperms •The angiosperms are divided into two groups on the basis of the number of cotyledons present in the seed . • Plants with seeds having a single cotyledon are called monocotyledonous or monocots • Plants with seed having two cotyledons are called dicots.
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