Comprehensive Biology Test 6
251. Cause of Jaundice:
Ans: Liver Infection
Explanation:
Jaundice occurs due to excess bilirubin from liver dysfunction, often caused by hepatitis or bile duct blockage.
252. Protein That Prevents Blood Clotting:
Ans: Heparin
Explanation:
Heparin inhibits clotting factors, preventing coagulation and maintaining smooth blood flow in the circulatory system.
253. Quinine Obtained From Which Part of Plant:
Ans: Bark
Explanation:
Quinine, used to treat malaria, is extracted from the bark of the Cinchona tree.
254. Incubation Done By:
Ans: Birds
Explanation:
Birds incubate eggs using body warmth, allowing embryo development until hatching.
255. Immediate Energy Supplied to Athletes Comes From:
Ans: Carbohydrates
Explanation:
Carbohydrates are rapidly metabolized to glucose, providing instant energy for high-intensity activities.
256. Sense of Taste:
Ans: Tongue
Explanation:
Taste is perceived by taste buds on the tongue, detecting sweet, sour, salty, bitter, and umami flavors.
257. Blood Cancer Known As:
Ans: Leukemia
Explanation:
Leukemia is a type of blood cancer affecting white blood cells, leading to uncontrolled proliferation and reduced immunity.
258. Who Coined the Term “Genetics”:
Ans: Bateson
Explanation:
William Bateson coined the term "Genetics" in 1905 for the scientific study of heredity and variation.
259. Father of Genetics:
Ans: Gregor Johann Mendel
Explanation:
Mendel discovered the basic laws of inheritance through pea plant experiments, laying the foundation of modern genetics.
260. Bioaccumulative Substance in Food Chains:
Ans: DDT
Explanation:
DDT, a pesticide, accumulates in organisms through the food chain, causing toxicity and ecological imbalance.
261. Why Animal Protein Is First-Grade:
Ans: Rich in Essential Amino Acids
Explanation:
Animal proteins contain all essential amino acids in sufficient quantities, making them complete proteins for human nutrition.
262. Strongest Bone in Body:
Ans: Jawbone (Mandible)
Explanation:
The mandible is the strongest bone, essential for chewing and structural support of the face.
263. Athlete’s Foot Caused By:
Ans: Fungus
Explanation:
Athlete’s foot is a fungal infection affecting skin between toes, causing itching and scaling.
264. Angora Wool Obtained From:
Ans: Rabbit
Explanation:
Angora wool comes from Angora rabbits, known for their soft, long, and warm fiber.
265. Genes Located In:
Ans: Chromosomes
Explanation:
Genes are units of heredity located on chromosomes, determining traits in an organism.
266. Pituitary Gland Located At:
Ans: Base of Brain
Explanation:
The pituitary gland, the master endocrine gland, regulates hormones controlling growth, metabolism, and reproduction.
267. Transpiration From Leaves Called:
Ans: Leaf Transpiration
Explanation:
Leaf transpiration is water loss in the form of vapor through stomata, aiding in nutrient transport and cooling.
268. Malaria Discovered By & Vector:
Ans: Ronald Ross; Female Anopheles
Explanation:
Ronald Ross discovered the role of female Anopheles mosquitoes in transmitting malaria parasites.
269. Science of Classification:
Ans: Taxonomy
Explanation:
Taxonomy studies classification, nomenclature, and identification of organisms based on shared characteristics.
270. How Vegetable Oils Convert to Ghee:
Ans: Hydrogenation
Explanation:
Vegetable oils are hydrogenated to produce ghee, converting unsaturated fats to saturated fats for stability and taste.
280. Loss of Substance During Excretion (Sodium Chloride) Due To:
Ans: Sweating
Explanation:
During excretion, sodium chloride and water are lost via sweat, helping maintain electrolyte balance.
290. Universal Blood Donors:
Ans: Blood Group O
Explanation:
O blood group lacks A/B antigens, making them universal donors compatible with all recipients.
291. Radioimmunoassay (RIA) Used For:
Ans: Detecting Antibodies & Hormones in Blood
Explanation:
RIA measures trace amounts of hormones or antibodies in blood using radioactive markers for diagnosis.
292. Glaucoma Disease:
Ans: Eye Disease
Explanation:
Glaucoma damages the optic nerve due to high intraocular pressure, leading to vision loss if untreated.
293. Plasma Membrane Composed Of (Eukaryotic Cells):
Ans: Phospholipids
Explanation:
Eukaryotic plasma membrane is a lipid bilayer composed mainly of phospholipids and proteins, regulating entry and exit of substances.
294. Saliva Digest Which Substance:
Ans: Starch
Explanation:
Saliva contains amylase, which breaks down starch into maltose in the oral cavity.
295. Optimal Dissolved Oxygen for Aquatic Life:
Ans: 4–6 mg/L
Explanation:
Aquatic organisms require 4–6 mg/L dissolved oxygen for respiration and survival; lower levels stress or kill aquatic life.
296. Thickest Skin in Human Body:
Ans: Soles of Feet
Explanation:
The skin on the soles is thickest to withstand pressure, friction, and protect underlying tissues.
297. Winter Sleep in Animals:
Ans: Hibernation
Explanation:
Hibernation is a state of inactivity during winter where animals reduce metabolic activity, conserving energy and surviving cold conditions.
298. Pain-Relieving Drugs Called:
Ans: Analgesics
Explanation:
Analgesics reduce or relieve pain without causing loss of consciousness; examples include aspirin, ibuprofen, and acetaminophen.
299. Amino Acids Needed For:
Ans: Protein Synthesis
Explanation:
Amino acids are building blocks of proteins, required for growth, repair, and synthesis of enzymes and structural components.
300. Endocrine Gland in Thoracic Cavity:
Ans: Thymus Gland
Explanation:
Thymus is a primary lymphoid organ in the chest that produces T-lymphocytes, crucial for adaptive immunity.