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on October 17, 2017

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Classification of Plants - Units, History, Systems - Armen Takhtajan Plant Classification

Botanical Classification of Plants – Classification of Plants By Different Scientists, Their Merits and Demerits With Plant Classification Chart Classification of plants is their arrangement into groups having common characteristics. These groups are arranged into a system. Similarly, species of flowering plants are placed in a Genus; similar genera are grouped into Families; families with common features are arranged into Orders; orders into Classes and classes into Divisions. The Aim of Botanical Classification of Plants The aim of the classification is to place the plant into a hierarchy of ranks or categories such as species, genera, families, and so on. In addition to expressing’ relationship based on common features, classification serves as a filing and information retrieval system and allows easier reference to organisms comprising the filing system, i.e., it provides an idea about the sequence of evolution of plants from simple to more complex and from more primitive to m...

Structure and Reproduction in Chara-Fresh Water Green Algae

Chara grows submerged in fresh water and upon muddy or sandy bottoms of pools and ponds, or in limestone streams. Certain species have the capacity of precipitating calcium carbonate from the water and covering themselves with calcareous layers. Clear hard water is suitable for their growth. Mature plant is enriched with CaCO 3 . Therefore, they are called as stone worts. Chara (Fresh Water Green Algae) Structure of Chara The plant body or structure of chara is as follow Thallus The plant body is thallus. The plant attains a height of 20-30cm. It has following demarcations. Rhizoids The erect, branched attached the substratum by means of rhizoids. Branches The thallus has long slender upright branches. The axis is differentiated into node and internodes. From each node arise the following four types of appendages, Branchlets: Each node bears a whorl of branches, which has limited growth. These are called branchlets. Long Branches: There are one or two branches of unlimited may als...

Difference Between Photoautotrophic and Chemoautotrophic Nutrition

In bacteria their is mainly two modes of nutrition autotrophic and hetertrophic. The autotrophes are further divided into types by their ability. They make make food by utilizing different resources. So on the basis of nutrition, the bacteria is divided into following types. What is Metabolism? All chemical reactions that occur in (living body) organisms is called metabolism . Metabolism is further classified into following types: Anabolism: Synthesis of complex molecules (large molecules) from simpler ones (small molecules) in living organisms is called anabolism. Catabolism: Breakdown of complex molecules (large molecules) into simpler ones (small molecules) in living organisms is called catabolism. Autotrophs Heterotrophs They make their own food by using inorganic carbon CO 2 . They use only organic carbon (organic compound). They do not depend on other organisms for gaining food. The obtain their energy from following sources. Light energy and chemical e...

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