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Class 11 Important Questions for Biology Chapter 1 Living World Question 1: Why are living organisms classified? ANSWER: A large variety of plants, animals, and microbes are found on earth. All these living organisms differ in size, shape, colour, habitat, and many other characteristics. As there are millions of living organisms on earth, studying each of them is impossible. Therefore, scientists have devised mechanisms to classify all living organisms. These methods of classification are based on rules and principles that allow identification, nomenclature, and finally classification of an organism. Question 2: Why are the classification systems changing every now and then? ANSWER: Millions of plants, animals, and microorganisms are found on earth. Many of these have been identified by the scientists while many new species are still being discovered around the world. Therefore, to classify these newly discovered species, new systems of classification have to be devised every now and t...

  MCQ Questions on Animal Kingdom 1. Which class has the largest number of animals? (a) Fishes (b) Reptiles (c) Insects (d) Mammals Answer: (c) Insects 2. Identify the characteristic of acoelomates (a) Absence of mesoderm (b) Absence of brain (c) Coelom that is incompletely lined with a mesoderm (d) Solid body without a cavity surrounding internal organs Answer: (d) Solid body without a cavity surrounding internal organs 3. Salamander belongs to the class (a) Pisces (b) Aves (c) Reptiles (d) Amphibian Answer: (d) Amphibian 4. Flame cells are the excretory structures for (a) Annelida (b) Coelenterates (c) Platyhelminthes (d) Echinodermata Answer: (c) Platyhelminthes 5. Select the correct pair (a) Arthropoda – silver fish (b) Pisces – jelly fish (c) Echinodermata – cuttle fish (d) Mollusca – star fish Answer: (a) Arthropoda – silver fish 6. Ascaris is characterized by (a) Presence of true coelom and metamerism (b) Presence of true coelom but the absence of metamerism (c) Absence of t...