Q.State whether each of the following set is finite or infinite:
(i) The set of lines which are parallel to the x-axis
(ii) The set of letters in the English alphabet
(iii) The set of numbers which are multiple of 5
(iv) The set of animals living on the earth
(v) The set of circles passing through the origin (0, 0)
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Q1 - Living organisms are classified into different types because there are several types of organisms based on different characteristics where it is difficult for us to study each organism separately. So, organisms are sorted into different kingdoms based on their similarities for easy understanding.
Q2 - Millions of plants, animals, and microorganisms found on earth, have been identified by the scientists while many new species are still being discovered around the world. Therefore, to classify these newly discovered species, with new characters, new systems of classification have to be devised every now and then.
Q3- The various criteria that may be chosen to classify people whom we meet often include behaviour, geographical location, morphology, family members, relatives, friends etc.
Q4- The identification of individuals based on their characteristics helps us to know how an individual differs from the other members of the population and in what points it is similar to the population. It also helps us in deriving relationships between individuals of different population.
Q5- For example, the basic level of classification is species, followed by genus, family, order, class, phylum or division, in ascending order. The highest level of classification is known as a kingdom. So each of these categories can be called as a taxon.
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