Top 100 Biology Questions for Exams
Duration: 31 min
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This video is a comprehensive educational lecture presenting 100 multiple-choice biology questions designed for exam preparation. The content is delivered in a structured, question-and-answer format, with the instructor appearing in a small window at the bottom right. The main screen displays a series of questions, each with four options, the correct answer, and an 'extra bite' of supplementary information. The questions cover a broad range of biological topics, including human anatomy (e.g., the heart, brain, kidneys), cell biology (e.g., mitochondria, chloroplasts, nucleus), nutrition (e.g., vitamins, minerals), genetics, and ecology. The video uses a consistent visual style, with diagrams of biological structures like a microscope, a neuron, and a plant cell appearing alongside the questions. The instructor explains the answers, often highlighting key terms and providing mnemonic or contextual clues to aid memorization, such as 'Mitochondria have their own DNA' or 'Golden Rice was engineered to increase provitamin A'. The progression moves from foundational concepts to more specific applications, culminating in the final question about photoreceptor cells in the eye.
Chapters
0:00 – 2:00 00:00-02:00
The video opens with a title slide for '100 Biology Questions'. The background is a light yellow with various biological illustrations, including a brain, a cell, a bacterium, a molecule, a skeleton, a plant cell, a heart, and a human muscular system. The instructor, a man in a purple shirt, appears in a small window at the bottom right, introducing the topic. The title '100 Biology Questions' is prominently displayed in the center, with a logo 'KG' in the top right corner. The instructor begins to speak, setting the stage for the lecture.
2:00 – 5:00 02:00-05:00
The video transitions to the first set of questions. Question 1 asks about the disease caused by Vitamin D deficiency, with the correct answer being Rickets (B). The 'extra bite' explains that fortified milk and sunlight exposure are standard prevention approaches. Question 2 asks for the 'powerhouse of the cell', with the answer being Mitochondria (C), and the 'extra bite' notes that mitochondria have their own DNA. Question 3 asks about the cause of night blindness, with the answer being Vitamin A (A), and the 'extra bite' mentions Golden Rice was engineered to increase provitamin A. Question 4 asks for the functional unit of the kidney, with the answer being Nephron (C), and the 'extra bite' states that each kidney has ~1 million nephrons. Question 5 asks where gas exchange occurs in lungs, with the answer being Alveoli (C), and the 'extra bite' explains that the large surface area makes diffusion highly efficient. The instructor explains each answer, with diagrams of a microscope and green cells appearing on the right.
5:00 – 10:00 05:00-10:00
The video continues with questions 6 to 15. Question 6 asks about the pigment responsible for the green color of plants, with the answer being Chlorophyll (B). Question 7 asks which tissue transports water in plants, with the answer being Xylem (C). Question 8 asks where insulin is secreted, with the answer being Pancreas (B). Question 9 asks what causes malaria, with the answer being Plasmodium falciparum (C). Question 10 asks for the smallest unit of life, with the answer being Cell (B). Question 11 asks about the universal blood donor group, with the answer being O (D). Question 12 asks where protein digestion starts, with the answer being Stomach (B). Question 13 asks for the largest organ in the human body, with the answer being Liver (B). Question 14 asks about the voice box, with the answer being Larynx (B). Question 15 asks about the vector of dengue, with the answer being Aedes (C). The instructor explains each answer, with diagrams of a red bacterium, a frog, a virus, and a cell appearing on the right.
10:00 – 15:00 10:00-15:00
The video presents questions 16 to 25. Question 16 asks about the cause of scurvy, with the answer being Vitamin C (B). Question 17 asks about the carbohydrate stored in animals, with the answer being Glycogen (C). Question 18 asks about the organism without a true nucleus, with the answer being Bacteria (C). Question 19 asks about the 'brain' of the cell, with the answer being Nucleus (A). Question 20 asks about the site of photosynthesis, with the answer being Chloroplast (B). Question 21 asks what red blood cells carry, with the answer being O2 (B). Question 22 asks which vitamin helps in blood clotting, with the answer being Vitamin K (D). Question 23 asks what a birth control pill primarily prevents, with the answer being Ovulation (B). Question 24 asks about the theory of 'Survival of the fittest', with the answer being Darwin (B). Question 25 asks which organ detoxifies chemicals, with the answer being Liver (C). The instructor explains each answer, with diagrams of a purple bacterium, a cell with chromosomes, and a heart appearing on the right.
15:00 – 20:00 15:00-20:00
The video continues with questions 26 to 35. Question 26 asks about the fluid part of blood, with the answer being Plasma (B). Question 27 asks about the smallest bone, with the answer being Stapes (A). Question 28 asks which is not a greenhouse gas, with the answer being N2 (C). Question 29 asks about the organelle for protein synthesis, with the answer being Ribosome (A). Question 30 asks about the seat of memory and intelligence, with the answer being Cerebrum (B). Question 31 asks about the hormone regulating basal metabolism, with the answer being Thyroxine (B). Question 32 asks where plant food is synthesized, with the answer being Leaves (C). Question 33 asks about a water-borne disease, with the answer being Typhoid (A). Question 34 asks what haemoglobin contains, with the answer being Iron (B). Question 35 asks about the basic unit of the nervous system, with the answer being Neuron (B). The instructor explains each answer, with diagrams of a scientist, a hand planting seeds, and a plant growing appearing on the right.
20:00 – 25:00 20:00-25:00
The video presents questions 36 to 45. Question 36 asks about the main component of a plant cell wall, with the answer being Cellulose (B). Question 37 asks about the cause of citrus canker, with the answer being Bacteria (B). Question 38 asks about the normal human body temperature, with the answer being 37.0°C (C). Question 39 asks where meiosis occurs, with the answer being Gamete-forming cells (B). Question 40 asks about the enzyme in saliva that digests starch, with the answer being Amylase (B). Question 41 asks about the cause of AIDS, with the answer being Virus (B). Question 42 asks about the largest gland in the body, with the answer being Liver (B). Question 43 asks about plant water loss, with the answer being Transpiration (B). Question 44 asks about the vitamin synthesized in the skin by sunlight, with the answer being Vitamin D (C). Question 45 asks about producers in a food chain, with the answer being Plants (C). The instructor explains each answer, with diagrams of a hand planting seeds, a deer, a wolf, and a plant growing appearing on the right.
25:00 – 30:00 25:00-30:00
The video continues with questions 46 to 55. Question 46 asks about the cause of goitre, with the answer being Iodine (B). Question 47 asks who discovered penicillin, with the answer being Fleming (A). Question 48 asks about the genetic material in most organisms, with the answer being DNA (C). Question 49 asks what Bt-cotton is resistant to, with the answer being Insects (B). Question 50 asks about the pacemaker of the heart, with the answer being SA node (B). Question 51 asks about the main nitrogenous waste in humans, with the answer being Urea (B). Question 52 asks where bile is produced, with the answer being Liver (B). Question 53 asks which blood cells fight infection, with the answer being WBC (B). Question 54 asks about an organism with both autotrophic and heterotrophic modes, with the answer being Euglena (B). Question 55 asks about the disease 'Kuru', with the answer being Prions (A). The instructor explains each answer, with diagrams of a heart, a neuron, and a red blood cell appearing on the right.
30:00 – 30:34 30:00-30:34
The video presents the final questions, 56 to 100. Question 56 asks about the cause of rust in wheat, with the answer being Fungus (A). Question 57 asks about the site of protein packaging and secretion, with the answer being Golgi apparatus (B). Question 58 asks about the largest artery in the body, with the answer being Aorta (B). Question 59 asks about the normal human chromosome number, with the answer being 46 (B). Question 60 asks about the disease affecting sickle-cell, with the answer being RBC (B). Question 61 asks about a non-component of the female reproductive system, with the answer being Vas deferens (C). Question 62 asks about the plant tissue for growth at tips, with the answer being Meristem (C). Question 63 asks about the fluid that bathes the brain and spinal cord, with the answer being CSF (B). Question 64 asks about the vitamin that prevents night blindness, with the answer being Vitamin A (B). Question 65 asks about the cause of diabetes mellitus, with the answer being Insulin (B). The video continues with questions 66 to 100, covering topics like polysaccharides, primary consumers, thyroid hormone, connective tissue, zoonotic diseases, cellular digestion, blood clotting, protein-digesting enzymes, hormones, bile storage, fat-soluble vitamins, blood pressure measurement, genetic crosses, vaccines, fat digestion, mineral absorption, liver functions, glucose storage, ear ossicles, sexually transmitted infections, greenhouse gases, food transport in plants, contraceptive mechanisms, niacin deficiency, and photoreceptor cells. The instructor explains each answer, with diagrams of a heart, a neuron, a red blood cell, a mushroom, a liver, an ear, a test tube, and a plant growing appearing on the right. The video concludes with the final question about photoreceptor cells, with the answer being Cones (B).
This video is a comprehensive review of 100 biology questions, structured as a lecture for exam preparation. The content progresses from fundamental concepts in human biology and cell structure to more specific topics in nutrition, genetics, and ecology. The instructor uses a consistent format: presenting a multiple-choice question, revealing the correct answer, and providing an 'extra bite' of related information to reinforce learning. The visual aids, such as diagrams of a microscope, a neuron, a plant cell, and a heart, are strategically placed to illustrate the concepts being discussed. The questions are designed to test both factual recall and conceptual understanding, with the 'extra bite' often providing a real-world application or a mnemonic. The overall teaching style is direct and efficient, aimed at helping students memorize key facts and understand the connections between different biological systems.