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Bio ppt

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Kaushal Sharma
Kaushal Sharma

The document classifies plants into six major groups - thallophyta, bryophyta, pteridophyta, gymnosperms, and angiosperms - based on the level of differentiation of their body structures and reproductive organs. It notes that thallophyta lack differentiated bodies, bryophyta have partially differentiated structures but no transport tissues, pteridophyta have fully differentiated roots, stems, and leaves as well as transport tissues, gymnosperms bear naked seeds, and angiosperms bear seeds within fruits that can be monocots or dicots.

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The first level of classification among plants depends on whether the plant body has well-differentiated, distinct components. The next level of classification is based on whether the differentiated plant body has special tissues for the transport of water and other substances within it. Further classification looks at the ability to bear seeds and whether the seeds are enclosed within fruits. plantae
Bio ppt
Plants that do not have well-differentiated body design fall in this group. The plants in this group are commonly called algae. These plants are predominantly aquatic. Examples are Spirogyra, Ulothrix, Cladophora and Chara THALLOPHYTA
These are called the amphibians of the plant kingdom. The plant body is commonly differentiated to form stem and leaf-like structures. However, there is no specialised tissue for the conduction of water and other substances from one part of the plant body to another. Examples are moss (Funaria) and Marchantia BRYOPHYTA
In this group, the plant body is differentiated into roots,stem and leaves and has specialised tissue for the conduction of water and other substances from one part of the plant body to another. Some examples are Marsilea, ferns and horse-tails (see Fig. 7.7). The thallophytes, the bryophytes and the pteridophytes have naked embryos that are called spores. The reproductive organs of plants in all these three groups are very inconspicuous, and they are therefore called cryptogamae, or those with hidden reproductive organs. This group is further classified, based on whether the seeds are naked or enclosed in fruits, giving us two groups: gymnosperms and angiosperms. PTERIDOPHYTA
This term is made from two Greek words: gymno means naked and sperma mean seed. The plants of this group bear naked seeds and are usually perennial, evergreen and woody. Examples are pines, such as deodar (see Fig. 7.8 for examples). GYMNOSPERMS
This word is made from two Greek words: angio means covered and sperma means seed. The seeds develop inside an organ which is modified to become a fruit. These are also called flowering plants. Plant embryos in seeds have structures called cotyledons. Cotyledons are called seed leaves because in many instances they emerge and become green when the seed germinates. Thus, cotyledons represent a bit of pre-designed plant in the seed. 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 seeds having two cotyledons are called dicots ANGIOSPERMS

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Bio ppt

  • 1. The first level of classification among plants depends on whether the plant body has well-differentiated, distinct components. The next level of classification is based on whether the differentiated plant body has special tissues for the transport of water and other substances within it. Further classification looks at the ability to bear seeds and whether the seeds are enclosed within fruits. plantae
  • 3. Plants that do not have well-differentiated body design fall in this group. The plants in this group are commonly called algae. These plants are predominantly aquatic. Examples are Spirogyra, Ulothrix, Cladophora and Chara THALLOPHYTA
  • 4. These are called the amphibians of the plant kingdom. The plant body is commonly differentiated to form stem and leaf-like structures. However, there is no specialised tissue for the conduction of water and other substances from one part of the plant body to another. Examples are moss (Funaria) and Marchantia BRYOPHYTA
  • 5. In this group, the plant body is differentiated into roots,stem and leaves and has specialised tissue for the conduction of water and other substances from one part of the plant body to another. Some examples are Marsilea, ferns and horse-tails (see Fig. 7.7). The thallophytes, the bryophytes and the pteridophytes have naked embryos that are called spores. The reproductive organs of plants in all these three groups are very inconspicuous, and they are therefore called cryptogamae, or those with hidden reproductive organs. This group is further classified, based on whether the seeds are naked or enclosed in fruits, giving us two groups: gymnosperms and angiosperms. PTERIDOPHYTA
  • 6. This term is made from two Greek words: gymno means naked and sperma mean seed. The plants of this group bear naked seeds and are usually perennial, evergreen and woody. Examples are pines, such as deodar (see Fig. 7.8 for examples). GYMNOSPERMS
  • 7. This word is made from two Greek words: angio means covered and sperma means seed. The seeds develop inside an organ which is modified to become a fruit. These are also called flowering plants. Plant embryos in seeds have structures called cotyledons. Cotyledons are called seed leaves because in many instances they emerge and become green when the seed germinates. Thus, cotyledons represent a bit of pre-designed plant in the seed. 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 seeds having two cotyledons are called dicots ANGIOSPERMS