Science > Physics > Cathode Rays and X- Rays > X-Rays Discovery of X- Rays: If a discharge tube is highly evacuated so that the pressure in the tube is of the order of 0.01 mm of mercury, certain rays are emitted by the cathode in the form of bluish streamers. These rays are called […]
Author: Hemant More
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Modes of Heat Transfer
Science > Physics > Heat Transfer > Convection and Radiation In this article, we shall study different modes of heat transfer. Convection: Convection is a mode of heat transfer through a material medium in which heat energy is carried from one place to another by actual motion “migration” of heated matter. Consider a beaker containing […]
Some liquids like water Kerosene flow very easily while some liquids like honey, glycerine do not flow easily. The property by virtue of which a liquid or a fluid opposes the relative motion between two adjacent layers is called viscosity. The force which opposes the relative motion between two adjacent layers in a fluid is […]
Biology > Microbes in Human Welfare > Biofertilizers and BioControl Agents In this article, we shall study the use of microbes as biocontrol agents and biofertilizers. Microbes as Biocontrol Agents: Chemical insecticides and pesticides are toxic and extremely harmful, to human beings and animals. These chemicals pollute the environment (soil, groundwater), fruits, vegetables, and crop […]
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Division Thallophyta
In this article, we shall study the characteristics and examples of Division Thallophyta. (Greek – Thallus – plant body without root, stem, and leaves; phyton – a plant) Characteristics of Division Thallophyta: Members of division Thallophyta are the most primitive and simple plants. The plant body is not differentiated into root, stem, and leaves. They are […]
In this article, we shall get a general idea of the classification of plants. In the next articles, we shall study the classification of plants in detail. Characteristics of Kingdom Plantae: Kingdom Plantae consists of all plants which are multicellular eukaryotes with cell walls. All plants contain plastids. Plastids are a double-membrane organelle that possesses photosynthetic […]
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Viruses
Science > Biology > Classification of Microbes, Protists, and Fungi > Viruses In the five-kingdom classification of Whittaker, there is no mention of some acellular organisms like viruses and viroids and lichens. Viruses did not find a place in classification since they are not truly ‘living’ if we understand living as those organisms that have […]
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Lichens
Science > Biology > Classification of Microbes, Protists, and Fungi > Lichens In the five-kingdom classification of Whittaker, there is no mention of some acellular organisms like viruses and viroids and lichens. A lichen is a long-living composite organism that arises from algae or cyanobacteria (or both) living among filaments of a fungus in a […]
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Kingdom Fungi
Science > Biology > Classification of Microbes, Protists, and Fungi > Kingdom Fungi Kingdom Fungi: The fungi constitute a unique kingdom of heterotrophic organisms. They show a great diversity in morphology and habitat. e.g., yeast is used to make bread and beer. Other fungi cause diseases in plants and animals; wheat rust-causing Puccinia is an […]
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Kingdom Protista
Science > Biology > Classification of Microbes, Protists, and Fungi > Kingdom Protista In the last article, we have discussed the Kingdom Monera. In this article, we shall study the Kingdom Protista. All single-celled eukaryotes are placed under Kingdom Protista (Greek – protistos – First of all), but the boundaries of this kingdom are not well […]