Anas Zoology

Visit You tube channel for more MCQ's:  https://www.youtube.com/channel/UCDI5O7VNvIby-Faq_ptLefw Previous Year Questions: 1. Column A lists names of evolutionary biologists and column B lists descriptions of evolutionary mechanisms proposed by them in random order.                                                               (June 2017) Column A Column B A) Jean Baptiste Lamarck i) Variation at the molecular level is selectively neutral B) Charles Darwin ii) Inheritance of acquired characters C) Motoo Kimura iii) Differential reproduction of genotypes D) Sewall Wright iv) Changes in allele frequency due to random genetic drift 1) A-i, B-ii, C-iv, D-iii 2) A-ii, B-iii, C-i, D=iv 3) A-iii, B-i, C-ii, D-iv 4) A-ii, B-iii, C-iv, D-i Ans. 2 - A-ii, B-iii, C-i, D=iv Explanation: Lamarck gave the theory of inheritance of acquired characters. In modern genetics na

Visit You tube channel for more MCQ's:  https://www.youtube.com/channel/UCDI5O7VNvIby-Faq_ptLefw Previous Year Questions: 1. Chitin is absent in which group ?                                                                         (Dec 2008) 1) Bacteria          2) Arthropods 3) Fungus            4) Mollusca Ans. 1 - Bacteria Explanation: Chitin is a polysaccharide found in the exoskeleton of arthropods like insects and crustaceans, as well as in the cell wall of fungi, it can also be found in the shells of some molluscs, it is not found in bacteria. Hence option 1 is correct. 2. Which of the following is a most hydrated polymer?                                           (June 2010) 1) Cellulose          2) Pectin 3) Lignin              4) Callose Ans. 2 - Pectin Explanation:  The degree of hydration of a polymer depends on its ability to form hydrogen bonds with water molecules. Among the options provided, pectin is generally considered the most hydrated polymer. Pectin is a polys

Visit You tube channel for more MCQ's:  https://www.youtube.com/channel/UCDI5O7VNvIby-Faq_ptLefw Previous Year Questions (PYQ's) 1. From the following statements,                                                                                         (DEC 2016) a) Hydrogen, Deuterium and Tritium differ in the number of protons. b) Hydrogen, Deuterium and Tritium differ in the number of neutrons. c) Both Deuterium and Tritium are radioactive and decay to hydrogen and deuterium respectively. d) Tritium is radioactive and decays to helium. e) Carbon-14 decays to Nitrogen-14. f) Carbon-14 decays to Carbon-13. Pick the combination with all correct statements. A) a, b and f      B) b, d and e C) a, c and d      D) c, e and f Ans. B - b, d and e Explanation: Hydrogen, deuterium and tritium are isotopes. Isotopes differ in the number of neutrons  and hence statement "b" is correct. Deuterium is non-radioactive but tritium is radioactive. Tritium shows β decay and tritium dec