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The terms ecosystem was introduction by Sir Arthur tensely in 1935. An ecosystem can be defined s "a structural and function unit of biosphere consisting of living organisms and their physical environment, both interacting and exchanging the materials between them". In other words," an ecosystem is an area that contains organisms For example Plants, animals, bacteria and human beings etc. which are interaction with one another and with their non- living environment". An ecosystem may be big or small, natural or manmade, eg.:
(i) Micro organism such as bacterial limited to few mm2 or cm2 areas (Natural).
(ii) Desert ecosystem may exist in hundreds of Km2 area (Natural).
(iii) Crop field , aquarium (Man made).
How dissimilar are the endosperm of gymnosperms and the endosperm of angiosperms? In the gymnosperms the endosperm is haploid (n), it is called as primary endosperm. In the ang
DISORDER S OF THE ADRENAL CORTEX - ( i ) ADDISON'S DISEASE : This disease is caused by the deficiency of mineralocorticoids and glucocorticoids. Its symptoms include l
Intracellular sodium concentration of the motor neuron A complete motor neuron is removed from a frog and placed in normal physiological saline at 1 AM. The neuron is healthy.
Which of the following compounds results from cyclization of glucose? Select one: a. alpha-D-glucopyronose b. beta-D-glucopyronose c. alpha-D-glucofuranose d. beta-D
Explain Relative Quantitative difference of Protein Taxonomy This analysis involves the study between the amounts of different proteins and more significantly, of different con
Q. Which is the typical feature of the hookworms related to the way they obtain food and explore the host? Both The Necator americanus and Ancylostoma duodenale have mouthparts
Define Isotope Dilution Method? The measurement of total body water (TBW) is based on the principle of hydrometry. You must be aware that water is the most abundant substance i
Q. What is the difference between sexual gametes and spores? Do humans present sexual gametes or spores? Sexual spores are structures generated from meiosis with ploidy number
Q. How are the major classes of arthropods classified according to the presence of larval stage in their embryonic development? In crustaceans there are others with indirect an
Explain root pressure? How can you demonstrate it experimentally? What is the cytological basis of Down's syndrome? Give two physical symptoms of this disorder. Describe why the
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