Anas Zoology

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

  Eukaryotic Cell Eukaryotic Cell The cells which contain true nuclei are called eukaryotic cells. Eukaryotic cells are found in animals, plants, algae and fungi. They are larger in size as compared to prokaryotic cells. The cells may vary in shape, size and physiology but they all have a typical structure with little variations in number and location of cellular organelles. The eukaryotic cell have a outer covering membrane called plasma membrane / cell membrane. Inside the cell a membrane-bound nucleus is present. Between the nucleus and plasma membrane, cytoplasm is present in which various cellular organelles like mitochondria, golgi complex, centrioles etc can be seen. ✱ Shape: Eukaryotic cells exhibit diversity. They can be spherical, triangular, tubular, cuboidal, polygonal, cylindrical, oval, rounded or elongated. Shape of cells may vary from organ to organ. A single organ may show variations in shape of cell. ✱ Size: Eukaryotic cells are microscopic. They are larger in size

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

Visit You tube channel for more MCQ's:  https://www.youtube.com/channel/UCDI5O7VNvIby-Faq_ptLefw Previous Year Questions: 1. Which of the following are required for the dark reaction of photosynthesis ?                    (2024)      A) Light      B) Chlorophyll      C) CO2      D) ATP      E) NADPH Choose the correct answer from the options given below: 1) A,B and C only      2) B,C and D only 3) C,D and E only      4) D and E only Ans. 3 - C,D and E only Explanation: Dark reaction of photosynthesis is also known as Calvin cycle. For every CO2 molecule entering the Calvin cycle, 3 molecules of ATP and 2 of NADPH are required. Hence CO2, ATP and NADPH are required for dark reaction of photosynthesis. 2. How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle ? (2024) 1) 2 molecules of ATP and 3 molecules of NADPH 2) 2 molecules of ATP and 2 molecules of NADPH 3) 3 molecules of ATP and 3 molecules of NADPH 4) 3 molecules of ATP and 2 mole