Your cart is currently empty!
Year: 2021
Vaucheria
According to Fritsch system of classification, Vaucheria is placed in Chlorophyceae. Fritsch system of classification: Class – Chlorophyceae Order – Siphonales Family – Vaucheriaceae Genus – Vaucheria According to Smith, Vaucheria is placed under Xanthophyceae. Smith system of classification: Class – Xanthophyceae Order – Heterosiphonales Family – Vaucheriaceae Genus –Vaucheria which…
Xanthophyceae (Yellow Green Algae)
General characteristics of Xanthophyceae Members of Xanthophyceae are commonly fresh water (Tribonema) and most of them are free floating. Plant body is unicellular (Heterochloris) or multicellular. The multicellular bodies also exhibit various forms like: Palmelloid (Chlorogloea), dendroid (Mischococcus), coccoid (Chlorobotrys), rhizopodial (Stipitococcus). Cells are eukaryotic with silica and pectin in cell wall. Chief pigment are…
FLOW OF HEAT
Heat is a form of energy that always flows from a hot body to a cold body. This flow of heat is known as transmission or transfer of heat. Heat travels from a region of higher temperature to a region of lower temperature in three ways. Conduction Convection Radiation CONDUCTION When the transfer of heat…
SOIL – Class 7
Soil is the upper most part of the surface of land. It contains many particles in it. FORMATION OF SOIL Weathering is a process in which huge rocks are broken down by the action of heat, wind, water and other natural and anthropogenic way to form small particles called soil. Formation of soil is a…
Ectocarpus
Systematic position Class- Phaeophyceae Order- Ectocarpales Family- Ectocarpaceae Genus – Ectocarpus Occurrence Plant body is cosmopolitan in distribution mainly in colder areas of temperate and polar region and along Atlantic coast About 16 species are reported in India. Majority of species are lithophytes (attached on rocks.) Some are marine algae few are fresh water forms.…
PHAEOPHYCEAE (Brown Algae)
Plant body is colonial, motile, non-motile, unbranched, filamentous immobile, multicellular and highly differentiated both externally and internally. It is characterised by the presence of golden brown xanthophylls pigment fucoxanthin which gives olive green color. Pigments lie in chromatophores. The reserve food is laminarin and mannitol. Laminarin is present in maximum quantity. The growth of plant…
Order : Ectocarpales
Important Characteristics Plant body is branched, heterotrichous and filamentous and some are psedoparenchymatous. Plant body elongates by intercalary growth. In filamentous form the cells are arranged uniseriatly. Each cell contains chloroplast with pyrenoids. Reproduction take place both asexually and sexually. Asexual reproduction take place by plurilocular sporangia. Sexual reproduction take place by isogamy and anisogamy,…
INSECT DIGESTIVE SYSTEM
Insect digestive system is of complete type which means starting from mouth, the alimentary canal terminates as anus. Along its length, alimentary canal is associated with salivary gland, salivary reservoir, hepatic or gastric caeca and Malpighian tubules (act as osmoregulater). Alimentary canal vary in size(diameter), anatomically modified structure as per the type of role during…
Thermodynamics
The word “Thermo” means Heat and “Dynamics” means flow. Thus, thermodynamics implies the flow of heat. But, now this term is used in much broader sense not only with heat rather with all forms of energies like chemical, physical, electrical energy, radiant energy, kinetic and potential energy. The study of this branch of science based…
General Characteristics of Chlorophyceae (Green Algae)
Grass green chromatophores. Presence of starch as reserve food Members of green algae mostly green in fresh water, a few in brackish and saline water and few are terrestrial. They show wide range of variations in their thallus structure like unicellular motile (Chlamydomonas), Coenobium(Volvox), palmelloid (Tetrospora), non motile (Chlorella), Dendroid (Ecballocystis), filamentous branched (Cladophora) and unbranched (Spirogyra), heterotrichous (Coleochaete), siphonaceous…