{"id":846,"date":"2025-01-12T02:59:07","date_gmt":"2025-01-12T02:59:07","guid":{"rendered":"https:\/\/itxperts.co.in\/blog\/?p=846"},"modified":"2025-01-14T03:44:12","modified_gmt":"2025-01-14T03:44:12","slug":"50-viva-questions-and-answers-for-cbse-class-12th-biology-practical-exam-2024-25","status":"publish","type":"post","link":"https:\/\/itxperts.co.in\/blog\/50-viva-questions-and-answers-for-cbse-class-12th-biology-practical-exam-2024-25\/","title":{"rendered":"50 Viva Questions and Answers for CBSE Class 12th Biology Practical Exam (2024-25)"},"content":{"rendered":"\n<p>Biology practical exams play a significant role in a student\u2019s overall performance in CBSE Class 12th. To excel, thorough preparation of viva questions is essential. Below is a curated list of 50 viva questions, along with concise answers, to help you ace your practical examination.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Section A: Experiments<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Q: What is the principle of plasmolysis?<\/strong><br><strong>A:<\/strong> Plasmolysis occurs when a plant cell loses water in a hypertonic solution, causing the cytoplasm to shrink away from the cell wall.<\/li>\n\n\n\n<li><strong>Q: What is the function of a compound microscope?<\/strong><br><strong>A:<\/strong> It magnifies small objects using multiple lenses for detailed study.<\/li>\n\n\n\n<li><strong>Q: How do you test for the presence of starch in a leaf?<\/strong><br><strong>A:<\/strong> Boil the leaf, decolorize it with alcohol, and add iodine. A blue-black color indicates starch.<\/li>\n\n\n\n<li><strong>Q: What is osmosis?<\/strong><br><strong>A:<\/strong> The movement of water molecules through a semi-permeable membrane from a region of low solute concentration to high solute concentration.<\/li>\n\n\n\n<li><strong>Q: What is mitosis?<\/strong><br><strong>A:<\/strong> A type of cell division that results in two identical daughter cells.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Section B: Specimens and Slides<\/strong><\/h4>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li><strong>Q: What is the shape of RBCs?<\/strong><br><strong>A:<\/strong> Biconcave.<\/li>\n\n\n\n<li><strong>Q: How can you differentiate between a dicot and a monocot stem?<\/strong><br><strong>A:<\/strong> A dicot stem has vascular bundles arranged in a ring, while monocots have scattered vascular bundles.<\/li>\n\n\n\n<li><strong>Q: What is the function of stomata?<\/strong><br><strong>A:<\/strong> Stomata regulate gas exchange and water loss through transpiration.<\/li>\n\n\n\n<li><strong>Q: Identify the given slide showing binary fission in Amoeba.<\/strong><br><strong>A:<\/strong> Binary fission in Amoeba shows one parent cell dividing into two identical daughter cells.<\/li>\n\n\n\n<li><strong>Q: What is a permanent slide?<\/strong><br><strong>A:<\/strong> A slide prepared for long-term use with specimens mounted permanently.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Section C: Biochemical Tests<\/strong><\/h4>\n\n\n\n<ol start=\"11\" class=\"wp-block-list\">\n<li><strong>Q: How do you test for proteins?<\/strong><br><strong>A:<\/strong> Use the Biuret test; a violet color indicates proteins.<\/li>\n\n\n\n<li><strong>Q: What reagent is used to test for glucose?<\/strong><br><strong>A:<\/strong> Benedict\u2019s solution.<\/li>\n\n\n\n<li><strong>Q: What is the positive test for lipids?<\/strong><br><strong>A:<\/strong> A translucent spot on paper confirms lipids.<\/li>\n\n\n\n<li><strong>Q: What does a positive iodine test indicate?<\/strong><br><strong>A:<\/strong> The presence of starch.<\/li>\n\n\n\n<li><strong>Q: What is the role of enzymes in digestion?<\/strong><br><strong>A:<\/strong> Enzymes break down complex food molecules into simpler forms.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Section D: Ecology and Environment<\/strong><\/h4>\n\n\n\n<ol start=\"16\" class=\"wp-block-list\">\n<li><strong>Q: Define ecosystem.<\/strong><br><strong>A:<\/strong> An ecosystem is a community of living organisms interacting with their physical environment.<\/li>\n\n\n\n<li><strong>Q: What is biomagnification?<\/strong><br><strong>A:<\/strong> The increase in concentration of toxins in organisms at higher trophic levels.<\/li>\n\n\n\n<li><strong>Q: What is the greenhouse effect?<\/strong><br><strong>A:<\/strong> Trapping of heat in the atmosphere due to gases like CO2 and methane.<\/li>\n\n\n\n<li><strong>Q: Name a biodegradable and a non-biodegradable material.<\/strong><br><strong>A:<\/strong> Biodegradable: Paper; Non-biodegradable: Plastic.<\/li>\n\n\n\n<li><strong>Q: What is eutrophication?<\/strong><br><strong>A:<\/strong> Excessive nutrient accumulation in water bodies leading to algal bloom and oxygen depletion.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Section E: Genetics<\/strong><\/h4>\n\n\n\n<ol start=\"21\" class=\"wp-block-list\">\n<li><strong>Q: Who is the father of genetics?<\/strong><br><strong>A:<\/strong> Gregor Mendel.<\/li>\n\n\n\n<li><strong>Q: Define mutation.<\/strong><br><strong>A:<\/strong> A sudden change in the genetic sequence.<\/li>\n\n\n\n<li><strong>Q: What are alleles?<\/strong><br><strong>A:<\/strong> Variants of a gene.<\/li>\n\n\n\n<li><strong>Q: What is the significance of the 9:3:3:1 ratio?<\/strong><br><strong>A:<\/strong> It represents the phenotypic ratio in a dihybrid cross.<\/li>\n\n\n\n<li><strong>Q: Name two sex-linked disorders.<\/strong><br><strong>A:<\/strong> Hemophilia and color blindness.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Section F: Human Physiology<\/strong><\/h4>\n\n\n\n<ol start=\"26\" class=\"wp-block-list\">\n<li><strong>Q: What is the normal blood pressure range?<\/strong><br><strong>A:<\/strong> 120\/80 mmHg.<\/li>\n\n\n\n<li><strong>Q: What is the function of hemoglobin?<\/strong><br><strong>A:<\/strong> Transport oxygen in the blood.<\/li>\n\n\n\n<li><strong>Q: Define reflex action.<\/strong><br><strong>A:<\/strong> An automatic response to a stimulus.<\/li>\n\n\n\n<li><strong>Q: What is the role of insulin?<\/strong><br><strong>A:<\/strong> It regulates blood sugar levels.<\/li>\n\n\n\n<li><strong>Q: What is the pH of gastric juice?<\/strong><br><strong>A:<\/strong> Around 1.5 to 3.5.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Section G: Miscellaneous<\/strong><\/h4>\n\n\n\n<ol start=\"31\" class=\"wp-block-list\">\n<li><strong>Q: What is the role of antibiotics?<\/strong><br><strong>A:<\/strong> To kill or inhibit the growth of bacteria.<\/li>\n\n\n\n<li><strong>Q: Name a unicellular organism.<\/strong><br><strong>A:<\/strong> Amoeba.<\/li>\n\n\n\n<li><strong>Q: What is phototropism?<\/strong><br><strong>A:<\/strong> Growth of a plant towards light.<\/li>\n\n\n\n<li><strong>Q: Define fermentation.<\/strong><br><strong>A:<\/strong> Anaerobic conversion of sugar to alcohol or acid by microbes.<\/li>\n\n\n\n<li><strong>Q: What is biodiversity?<\/strong><br><strong>A:<\/strong> The variety of life forms in an ecosystem.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Advanced Questions<\/strong><\/h4>\n\n\n\n<ol start=\"36\" class=\"wp-block-list\">\n<li><strong>Q: Explain electrophoresis.<\/strong><br><strong>A:<\/strong> A technique to separate DNA or proteins based on size and charge.<\/li>\n\n\n\n<li><strong>Q: What is the significance of Rh factor in blood?<\/strong><br><strong>A:<\/strong> It determines if blood type is positive or negative.<\/li>\n\n\n\n<li><strong>Q: Define tissue culture.<\/strong><br><strong>A:<\/strong> Growing plant or animal cells in a nutrient medium.<\/li>\n\n\n\n<li><strong>Q: What is the role of mycorrhiza?<\/strong><br><strong>A:<\/strong> A symbiotic association between fungi and plant roots for nutrient exchange.<\/li>\n\n\n\n<li><strong>Q: Name two endangered species in India.<\/strong><br><strong>A:<\/strong> Bengal Tiger and Indian Rhinoceros.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Practical Application Questions<\/strong><\/h4>\n\n\n\n<ol start=\"41\" class=\"wp-block-list\">\n<li><strong>Q: Why is staining important in microscopy?<\/strong><br><strong>A:<\/strong> To enhance visibility of cell structures.<\/li>\n\n\n\n<li><strong>Q: Define transpiration.<\/strong><br><strong>A:<\/strong> Loss of water vapor from aerial parts of plants.<\/li>\n\n\n\n<li><strong>Q: What is the purpose of a quadrant in ecology?<\/strong><br><strong>A:<\/strong> To measure the population density of species.<\/li>\n\n\n\n<li><strong>Q: What is DNA fingerprinting?<\/strong><br><strong>A:<\/strong> Identifying individuals based on their unique DNA patterns.<\/li>\n\n\n\n<li><strong>Q: What does a pH indicator do?<\/strong><br><strong>A:<\/strong> Determines the acidity or alkalinity of a solution.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Final Rapid-Fire Questions<\/strong><\/h4>\n\n\n\n<ol start=\"46\" class=\"wp-block-list\">\n<li><strong>Q: What is the chromosome number in humans?<\/strong><br><strong>A:<\/strong> 46 (23 pairs).<\/li>\n\n\n\n<li><strong>Q: Name the functional unit of the kidney.<\/strong><br><strong>A:<\/strong> Nephron.<\/li>\n\n\n\n<li><strong>Q: What is the full form of HIV?<\/strong><br><strong>A:<\/strong> Human Immunodeficiency Virus.<\/li>\n\n\n\n<li><strong>Q: What is pollination?<\/strong><br><strong>A:<\/strong> Transfer of pollen from anther to stigma.<\/li>\n\n\n\n<li><strong>Q: Define anaerobic respiration.<\/strong><br><strong>A:<\/strong> Respiration that occurs without oxygen, producing less energy.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Tips for Answering Viva Questions<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Be Concise:<\/strong> Provide direct and to-the-point answers.<\/li>\n\n\n\n<li><strong>Understand the Concepts:<\/strong> Memorizing answers is less effective than understanding them.<\/li>\n\n\n\n<li><strong>Ask for Clarification:<\/strong> If a question is unclear, politely ask for clarification.<\/li>\n\n\n\n<li><strong>Stay Calm and Confident:<\/strong> Your demeanor matters as much as your knowledge.<\/li>\n<\/ul>\n\n\n\n<p>Prepare thoroughly and give your best! Good luck! \ud83d\ude0a<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Biology practical exams play a significant role in a student\u2019s overall performance in CBSE Class 12th. To excel, thorough preparation of viva questions is essential. Below is a curated list of 50 viva questions, along with concise answers, to help you ace your practical examination. Section A: Experiments Section B: Specimens and Slides Section C: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":857,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"googlesitekit_rrm_CAow44u0DA:productID":"","footnotes":""},"categories":[169],"tags":[166],"class_list":["post-846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-viva","tag-viva"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>50 Viva Questions and Answers for CBSE Class 12th Biology Practical Exam (2024-25) - Itxperts<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itxperts.co.in\/blog\/50-viva-questions-and-answers-for-cbse-class-12th-biology-practical-exam-2024-25\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"50 Viva Questions and Answers for CBSE Class 12th Biology Practical Exam (2024-25) - Itxperts\" \/>\n<meta property=\"og:description\" content=\"Biology practical exams play a significant role in a student\u2019s overall performance in CBSE Class 12th. 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