How to Save Ailing Planet Earth from Vehicuar Pollution
Plant Kingdom (Biology) | Close | |
Study Material | |
Division Algae
Classification within Angiosperms * Artificial system of classification * Given by Linnaeus * Based on vegetative characters and androecium structures * Gave equal importance to vegetative and sexual characteristics * Natural system of classification * Based on morphology, anatomy, embryology, and phytochemistry * Given by George Bentham and Joseph Dalton Hooker * Phylogenetic system of classification - based on evolutionary relationship * Numerical Taxonomy * Based on all observable characteristics * Numbers and codes assigned to all characters * Easily carried out using computers * Cytotaxonomy − Based on cytological information such as chromosome number, structure, behaviour * Chemotaxonomy − Based on chemical constituents of plant to resolve doubts and confusions
Division Algae * Includes chlorophyll-bearing, simple, thalloid, autotrophic, and largely aquatic (freshwater and marine) organisms * Some occur in association with fungi (lichens) and animals (on sloth bear). * Size ranges from microscopic unicellular forms such as Chlamydomonas to colonial forms such as Volvoxand to filamentous forms such as Ulothrix and Spirogyra. * Massive plant-like bodies are seen in some marine forms (such as kelps).
Economic Importance * Carbon dioxide fixation on earth is majorly carried out by algae. * Important as primary producers of energy-rich compounds
Example − Sargassum, Laminaria, and Porphyra used as food * Some brown and red algae species produce water-holding hydrocolloids.
Example − Algin (brown algae) and carrageen (red algae) * Agar produced by Gelidium and Gracilaria is used to grow microbes and in preparation of ice creams and jellies. * Chlorella and Spirulina are protein-rich unicellular algae, used as food supplements. They are also known as space food. *
Study Material | |
Division Algae
Classification within Angiosperms * Artificial system of classification * Given by Linnaeus * Based on vegetative characters and androecium structures * Gave equal importance to vegetative and sexual characteristics * Natural system of classification * Based on morphology, anatomy, embryology, and phytochemistry * Given by George Bentham and Joseph Dalton Hooker * Phylogenetic system of classification - based on evolutionary relationship * Numerical Taxonomy * Based on all observable characteristics * Numbers and codes assigned to all characters * Easily carried out using computers * Cytotaxonomy − Based on cytological information such as chromosome number, structure, behaviour * Chemotaxonomy − Based on chemical constituents of plant to resolve doubts and confusions
Division Algae * Includes chlorophyll-bearing, simple, thalloid, autotrophic, and largely aquatic (freshwater and marine) organisms * Some occur in association with fungi (lichens) and animals (on sloth bear). * Size ranges from microscopic unicellular forms such as Chlamydomonas to colonial forms such as Volvoxand to filamentous forms such as Ulothrix and Spirogyra. * Massive plant-like bodies are seen in some marine forms (such as kelps).
Economic Importance * Carbon dioxide fixation on earth is majorly carried out by algae. * Important as primary producers of energy-rich compounds
Example − Sargassum, Laminaria, and Porphyra used as food * Some brown and red algae species produce water-holding hydrocolloids.
Example − Algin (brown algae) and carrageen (red algae) * Agar produced by Gelidium and Gracilaria is used to grow microbes and in preparation of ice creams and jellies. * Chlorella and Spirulina are protein-rich unicellular algae, used as food supplements. They are also known as space food. *