Anas Zoology

Visit You tube channel for more MCQ's:  https://www.youtube.com/channel/UCDI5O7VNvIby-Faq_ptLefw Previous Year Questions: 1. Match the List I with List II                                                                                                        (2024)                         LIST I                                                                                     LIST II A. Two or more alternative forms of a gene.                                           I. Back cross B. Cross of F1 progeny with homozygous recessive parent.                  II. Ploidy C. Cross of F1 progeny with any of the parent.                                     III. Allele D. Number of chromosome sets in plant.                                               IV. Test cross Choose the correct answer from the options given below. 1) A-I, B-II, C-III, D-IV 2) A-II, B-I, C-III, D-IV 3) A-III, B-IV, C-I, D-II 4) A-IV, B-III, C-II, D-I Ans. 3 -  A-III, B-IV, C-I, D-II Explanation: Two or more alternati

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. List of endangered species was released by-                                                                               (2024) 1) GEAC 2) WWF 3) FOAM 4) IUCN Ans. 4 - IUCN 2. These are regarded as major cause of biodiversity loss:                                                         (2024) A. Over exploitation B. Co-extinction C. Mutation D. Habitat loss and fragmentation E. Co-extinctions Choose the correct option: 1) A,C and D only          2) A,B,C and D only 3) A,B and E only          4) A,B and D only Ans. 4 - A,B and D only. Explanation: Causes of biodiversity loss are 1) Habitat loss and fragmentation. 2) Over-exploitation 3) Alien species invasion 4) Co-extinctions 3. Tropical regions show greatest level of species richness because                                             (2024) A. Tropical latitudes have remained relatively undisturbed for mi

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

  2. Life Processes in Living Organisms - Part I ✱ Energy from different food components: Various organ-systems perform their functions in human body. Digestive system, respiratory system, circulatory system, excretory system, nervous system. All these system require energy. Energy is obtained from food. Food contains nutrients like carbohydrates, proteins, fats. For obtaining energy only nutrients are not sufficient, but oxygen is also necessary. All these foodstuff and oxygen are transported up to the cell via a circulatory system. 1. Carbohydrates: Sources of carbohydrates: Milk, fruits, jaggary, cane sugar, vegetables, potatoes, sweet meats and cereals like wheat, maize, ragi, jowar, millet, rice etc. 1 gm of carbohydrate = 4 Kcal of energy (Kcal = Kilocalorie) 2. Proteins: Sources of proteins: Pulses, egg, fish, chicken, mutton. Animal proteins are called 'first class'  protein. 1 gm protein = 4 Kcal of energy. Proteins are formed by amino acids. Hence on digestion, protei

  Previous Year Questions: 1. Bulliform cells are responsible for                                                                                              (2024) A) Inward curling of leaves in monocot B) Protecting the plant from salt stress. C) Increased photosynthesis in monocots. D) Providing large space for storage of sugar. Ans. A - Inward curling of leaves in monocot. Explanation: In grasses certain adaxial epidermal cell along the veins modify themselves into large, empty, colorless cells. These are called bulliform cells. When the bulliform cells in the leaves have absorbed water and are turgid, the leaf surface is exposed. When they are flaccid due to water stress, they make the leaves curl inwards to minimize water loss. 2. In the given figure, which component has thin outer walls and highly thickened inner walls?       (2024) A) C      B) D C) A      D) B Ans. A - C Explanation: The given figure is of stomata with bean shaped guard cells. A is epidermal cells. B is subsi

Visit You tube channel for more MCQ's:  https://www.youtube.com/channel/UCDI5O7VNvIby-Faq_ptLefw Previous Year Questions: 1. Spindle fibers attach to kinetochores of chromosomes during                                                (2024) 1) Prophase        2) Metaphase 3) Anaphase       4) Telophase Ans. 2 - Metaphase Explanation: The key feature of metaphase are: 1. Spindle fibers attach to kinetochores of chromosomes. 2. Chromosomes are moved to spindle equator and get aligned along metaphase plate through spindle fibers to both poles. 2. Given below are two statements:                                                                                             (2024) Statement I: Chromosomes become gradually visible under light microscope during leptotene stage. Statement II: The beginning of diplotene stage is recognized by dissolution of synaptonemal complex. In the light of the above statements, choose the correct answer from the options given below: 1) Both statement I and s