What are the advantages of classifying organisms?
Classification is advantageous in the following way:
(i) Classification makes the study of huge varieties of organisms easy.
(ii) It helps us to understand the interrelationship among different groups of organisms.
(iii) It helps in the specific identification of any given organism.
(iv) The study of a few representatives from each distinct group helps us to integrate the idea of life as a whole.
(v) It reveals the relationships among various groups of organisms.
(vi) It provides information about plants and animals, which occur in specific geographical regions.
(vii) It indicates the evolutionary relationship by establishing the gradually increasing complexity of form and structure in different groups of organisms.
Explain the basis for grouping organisms into five kingdoms.
The basis for grouping organisms into five kingdom are:
(i) Cell structure
(ii) Mode
(iii) Source of nutrition
(iv) Body organisation.
How would you choose between two characteristics to be used for developing a hierarchy in classification?
The characteristic which is dependent on the previous one and would decide the variety in the next level should be chosen for developing a hierarchy in classification.
What are the major divisions in the plantae? What is the basis for these divisions?
Major divisions in kingdom plantae are—
(i) Thallophyta
(ii) Bryophyta
(iii) Pteridophyta
(iv) Gymnosperms
(v) Angiosperms.
Basis for classification plantae division :
1. Whether the plant body has well differentiated, distinct components is the basis for the first level of classification.
2. Whether the differentiated plant body has special tissues for the transport of water and other substances within it forms the basis for the second level of classification.
3. Whether the plants bear the seeds forms the next level of classification.
4. Whether the seeds are enclosed within fruits.
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
The criteria for classification of plant kingdom into divisions depend upon:
(a) differentiation of plant body components,
(b) presence of transport (conduction) tissues,
(c) ability to produce seeds, and
(d) enclouser seeds in fruits.
Animals are organisms which are eukaryotic,
multicellular and heterotrophic. Their cells
do not have cell-walls. Most animals are
mobile. Thus they have different criteria for classification - they are classified based on the
extent and type of the body design
differentiation found.
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