Anas Zoology

What are Sponges ? Simple, mostly marine animals, adult sponges live permanently attached to rocks, corals, and shipwrecks. A few species live in freshwater. Sponges belong to phylum Porifera. The Porifera vary in size and shape, from thin sheets to huge barrels, but all have the same basic structure: different types of specialist cells, but no organs. A system of water canal branches through the sponge, and water is drawn into them through tiny pores in the sponges surface. Special chambers or cells lining the water canals trap and engulf bacteria from plankton for food, and waste water exits through large openings called oscula.  Many sponges are classically "spongy", others are rock hard, soft, or even slimy depending on the supporting skeleton, which is made of tiny spicules of silica or calcium carbonate. Spicules vary in shape and number between species and can be used in identification. Calcareous Sponges: Lemon sponge is a calcareous sponge. The skeleton of Calcarea i

Visit You tube channel for more MCQ's:  https://www.youtube.com/channel/UCDI5O7VNvIby-Faq_ptLefw Previous Year Questions: 1. Identify the part of the seed from the given figure which is destined to form root when the seed germinates. (2024) 1) A     2) B 3) C     4) D Ans. 3 - C Explanation: In the given figure 'C' represents radicle. Radicle is the part of the seed from which roots are formed. 2. Which of the following is an example of actinomorphic flower ? (2024) 1)  Datura          2) Cassia 3) Pisum            4) Sesbania Ans. 1 - Datura Explanation: Datura is an example of actinomorphic (radial symmetry) flower. Cassis, Pisum and Sesbania are examples of zygomorphic (bilateral symmetry) flower. 3. Identify the type of flowers based on the position of calyx, corolla and androecium with respect to the ovary from the given figures (a) and (b)  (2024) 1) (a) Epigynous; (b) Hypogynous  2) (a) Hypogynous; (b) Epigynous 3) (a) Perigynous; (b) Epigynous  4) (a) Perigynous; (b

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