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mechanisms for response ndash protozoanprotozoa are sensitive to many kinds of stimuli like touch temperature changes light chemicals etc it is not
respiration ndash protozoangas exchange occurs by the diffusion of oxygen across the cell membrane some protozoan utilize this oxygen but are also
osmoregulation in protozoansosmoregulation or water balance in protozoa is accomplished by contractile vacuoles one to several contractile vacuoles
locomotor organellesthe protozoan locomotor organelle may beflagella cilia or pseudopodia these are of considerable value in classification of
write the names of these write the names of these
general characteristics of protozoansthe protozoans are eukaryotes that form a group of about 80000 single-celled organisms under the kingdom
inter-relationships of classificationthe aim of classification is to put together organisms on the basis of their similarities but the question is
limitations of five-kingdom classificationas already pointed out each system of classification has its own limitations the two-kingdom system has
characteristics of the five-kingdom classificationat present as you know the trend is to follow the five-kingdom classification however while
three and four kingdom classificationthe two-kingdom classification while solving many of the problems of classification failed to establish
responses of plants to stressthe internal chemical signals and environmental factors - the external signals which are perceived by special molecules
binomial nomenclaturethe modern system of classification binomial nomenclature accepted by biologists today was proposed in 1758 by the swedish
classification of living organisms ndash speciesyou have by now already come across the word species the word has a definite meaning in biology
classification of living organismsthe world of living organisms is extremely diverse biologists call these diverse forms species it is estimated that
prokaryotes and eukaryotesby now you know that cell theory holds good for all living forms however if you examine under the microscope the cells of a
exceptions to the cell theoryviruses however are not the only exception to the cell theory as formulated earlier this has led scientists to take a
features of plant and animal cell however plant and animal cells also differ one of the most prominent features of the plant cell is its huge
acellular and cellular organismsyou should be able to characterise living and non- living matter however the boundary-line between the two is not
phases of virusesviruses have two phases to their existenceinside their host cells where they exhibit certain living characteristicsoutside their
virusesviruses are sub cellular ultramicroscopic infectious agents of 20 nm-300 nm size range many of them cause diseases like polio dengue small pox
movementmovement is another characteristic of living things it does not always mean locomotion or movement from one place to another in animals
homeostasis homeostasis may be defined as the maintenance of constancy in the internal environment of the organism this is essential for maintenance
growth and development of plantsyou must have seen beautiful plants growing in pots in a garden the plant grows while the pot does not as a rule
cellular respirationcellular respiration is more or less a reverse process of photosynthesis during cellular respiration complex carbon compounds
photosynthesistwo main energy pathways are recognised in living systems these are photosynthesis and cellular respiration both have their respective