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शनिवार, 29 जुलाई 2017
DIVERSITY IN LIVING ORGANISM PART-II
(Chapter – end)
1. What are the advantages of classifying organisms? Ans. Because of the huge biodiversity i.e. variety of life forms existing on earth it becomes very difficult to study them individually so scientists have made groups of organisms based on their similarities and dissimilarities. Such categorization of organisms is known as classification which help us to study them easily and systematically.
2. How would you choose between two characteristics to be used for developing a hierarchy in classification? Ans. We would choose the characteristic related to their structure and function that will help developing a hierarchy from one level to the next level. Like arthropods are organisms with jointed appendages but among arthropods insects and spiders make to separate groups having peculiar characteristics to define them. Hence we can make the hierarchy in classification by selecting general to specific characteristics. 3. Explain the basis for grouping organisms into five kingdoms. Ans. The basis for grouping organisms into five kingdoms is as follows: a) The organisms are made of prokaryotic or eukaryotic cells. b) The organism has a single cell in its body or is a multicellular life form. c) The organism prepares its own food or is dependent on other for food. 4. What are the major divisions in the Plantae? What is the basis for these divisions? Ans. 5. How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals? Ans. Animals are classified into subgroups on the basis of their level of body organization (cellular, tissue, organ grade) and symmetry, body cavity and presence or absence of notochord etc. 6. Explain how animals in Vertebrata are classified into further subgroups. Ans. Animals in Vertebrata are classified into further subgroups based on their development of nervous system, circulatory system, reproductive methods etc.