Download PDF – Class – XI Biology Chapter 1 NCERT Solutions – Q&A

Class – XI Biology Chapter 1 NCERT Solutions – Q&A

Q1.

Answer: Living organisms are classified to make their study easier and systematic. Classification helps in identification, understanding similarities and differences among organisms, studying their evolutionary relationships, and ensuring uniformity in scientific communication worldwide.

Q2.

Answer: Classification systems keep changing due to the discovery of new organisms and the development of new techniques such as molecular biology and genetic analysis. Improved understanding of evolutionary relationships has also led to revisions in existing classification systems.

Q3.

Answer: People can be classified based on various criteria such as age, sex, profession, educational background, language spoken, place of residence, and lifestyle habits.

Q4.

Answer: Identification helps in recognizing organisms correctly, understanding their characteristics, distribution, population structure, evolutionary relationships, and ecological roles. It is essential for biodiversity studies and conservation planning.

Q5.

Answer: A taxon is a taxonomic group of any rank in the classification system. Examples of taxa at different levels: Kingdom: Animalia, Phylum: Chordata, Class: Mammalia, Order: Primates, Family: Hominidae, Genus: Homo, Species: Homo sapiens

Q6.

Answer: A species is the basic unit of classification, defined as a group of organisms capable of interbreeding and producing fertile offspring under natural conditions. In higher plants and animals: Species are defined based on reproductive isolation and the ability to interbreed. In bacteria: Since reproduction is asexual, species are defined based on genetic similarity, biochemical characteristics, and DNA homology.

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