Biological classification part 3 Khushboo Gupta
This course will be helpful for - For all pre-medical examination (NEET JIPMER AlIMS and all state level exams) Useful for students of class 11th and 12th cbse and rbse. Helpful for all biological Olympiads.
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Kingdom protista It consists of all single-celled eukaryotes Boundaries are not well defined. Nucleus is well defined and other membrane bound organelles. Some have cilia or flagella. They reproduce asexually or sexually by a process of involving cell fusion and zygote formation.
Protista Chrysophytes Dinoflagellate Eugleniods Slime moulds Protozoa Amoeboid Flagellated Ciliated Sporozoa
Chrysophytes Habit and habitat It includes diatom and golden algae (desmids) They found in fresh water and marine water. Structure Microscopic, float passively in water current (plankton), mainly they are photosynthetic. In diatoms the cell wall form 2 thin overlapping shells which fil together as in a soap box The walls are embedded with silica and this walls are indestructible. Soo, diatoms have left behind large amount of cell wall deposit in their habitat; thus assimilation over billion of years is referred as "Diatomaceous Earth" Gritty soil is used in polishing, filtration of oils and syrups. Diatoms are chief producer in the ocean
Dinoflagellate Habit and habitat Mostly marine and photosynthetic. Structure Yellow, green, brown, blue or red depending upon the pigments present in their cell. Cell wall has stiff cellulose plates on outer surface Most of them have 2 flagella one lies longitudinally and other transversely.
Eugleniods Habit and habitat Fresh water organisms found in stagnant water photosynthetic In presence of sunlight but deprived of sunlight they act as heterotroph by predating other organisms Structure Instead of cell wall , tey have protein rich layer called pellicle which makes their body flexible. They have 2 flagella, a short and a long one Ex- euglena
Protozoans Heterotroph and live as predators or parasites. 4 major group are- Amoeboid protozoans- fresh water, sea water and moist soil They move and capture their prey by putting out pseudopodia ex amoeba Marine forms have silica shells on their surface Ex entamoeba are parasites Flagellated protozoans: they have flagella, mainly free living or parasitic. Sleeping sickness caused by trypanosoma Ciliated protozoans aquatic, mainly have cilia to move. Ex paramecium Sporozoans protozoans: includes infectious form spores like stage in their life cycle Ex plasmodium (malarial parasites) which causes malaria
Slime moulds Saprophytic protists They moves along decaying twigs and leaves, engulf organic material Under suitable condition they form an aggregation called plasmodium which grow and spread over several feet During unsuitable condition, the plasmodium differentiated and forms fruiting bodies bearing spores at their tips Extremely resistant and survive for many years
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