Comprehensive Biology Test 7
301. Pleura Covers:
Ans: Lungs
Explanation:
Pleura is a double-layered membrane surrounding lungs, reducing friction during breathing movements.
302. Dehydration Causes Deficiency Of:
Ans: Sodium Chloride
Explanation:
During dehydration, electrolytes like sodium chloride are lost along with water, affecting cellular and bodily functions.
303. Brain Lobe Associated With Hearing:
Answer: Temporal Lobe
Explanation:
The temporal lobe processes auditory information and is crucial for hearing, speech perception, and memory.
304. Eye Part Swells When Dust Enters:
Ans: Conjunctiva
Explanation:
The conjunctiva, a thin membrane over the eyeball, swells (redness) to protect the eye from dust or foreign particles.
305. Storage Organ in Cabbage:
Ans: Leaves
Explanation:
Cabbage stores food primarily in its leaves, which become thick and fleshy, rich in nutrients and water.
306. Pneumoconiosis Caused By:
Answer: Iron Dust
Explanation:
Inhalation of iron or mineral dust leads to pneumoconiosis, a lung disease characterized by fibrosis and breathing difficulty.
307. Image on Retina:
Answer: Real, Inverted, and Smaller than Object
Explanation:
The lens forms a real, inverted, and reduced image on the retina, which is then processed by the brain to perceive upright objects.
308. Study of Fungi:
Answer: Mycology
Explanation:
Mycology is the branch of biology studying fungi, including their genetics, physiology, and ecological roles.
309. Ascending Movement of Sap in Plants:
Answer: Xylem
Explanation:
Xylem vessels transport water and minerals from roots to leaves through capillary action, root pressure, and transpiration pull.
310. Hypoglycemia Means:
Answer: Low Blood Sugar
Explanation:
Hypoglycemia refers to abnormally low glucose levels in the blood, causing weakness, dizziness, and potential metabolic disturbances.
311. Nutritional Tissue of Seeds in Higher Plants:
Answer: Endosperm
Explanation:
Endosperm is a tissue inside seeds that stores starch, proteins, and oils to nourish the developing embryo.
312. Process of Converting Extra Light Energy in Photosynthesis:
Answer: Photochemical Reaction (Light Reaction)
Explanation:
Light energy is absorbed by chlorophyll and converted into chemical energy (ATP, NADPH) during the light-dependent reactions of photosynthesis.
313. Discovery of Blood Groups:
Answer: Landsteiner
Explanation:
Karl Landsteiner discovered A, B, AB, and O blood groups, revolutionizing safe blood transfusions.
314. Cell Wall Containing Cellulose Found In:
Answer: Plant Cells
Explanation:
Cellulose forms the rigid structure of plant cell walls, providing mechanical support and protection.
315. Why Vegetables Spoil Quickly:
Answer: High Water Content
Explanation:
Vegetables with high moisture content are prone to microbial growth, leading to rapid spoilage
316. Mercury Poisoning Causes Which Disease in Humans:
Answer: Minamata Disease
Explanation:
Minamata disease results from mercury poisoning, causing neurological symptoms, primarily from contaminated fish consumption.
317. Photosynthesis Most Efficient in Which Light:
Answer: Red Light
Explanation:
Red light is absorbed efficiently by chlorophyll, driving the maximum rate of photosynthesis.
318. Minimum Audible Sound Level for Most Humans:
Answer: 0 dB
Explanation:
The threshold of hearing for humans is approximately 0 decibels; normal sounds are comfortably heard between 60–80 dB.
319. Maximum Conversion of Solar Energy Occurs In:
Answer: Green Plants
Explanation:
Green plants absorb sunlight through chlorophyll to perform photosynthesis, converting solar energy into chemical energy (carbohydrates).
320. Controlling Environmental Pollution By:
Answer: Preventing Nuclear Explosions, Using Electric Vehicles
Explanation:
Limiting nuclear activities and promoting clean technologies like electric vehicles reduces air, water, and soil pollution.
321. Anticoagulant Substance in Blood:
Answer: Heparin
Explanation:
Heparin prevents blood clotting by inhibiting thrombin and other clotting factors, maintaining smooth circulation.
322. First Person to Use the Term "Gene":
Answer: Johannsen
Explanation:
Johannsen coined the term “gene” in 1909 to describe units of heredity controlling traits in organisms.
323. Carrot Color Due To:
Answer: Carotene
Explanation:
Carotene, a pigment in carrots, gives them their characteristic orange color and acts as a vitamin A precursor.
324. Itai-Itai Disease Caused By:
Answer: Cadmium
Explanation:
Cadmium toxicity, often from contaminated water or rice, causes bone pain, kidney damage, and the Itai-Itai disease.
325. Hairy Seeds Attach To:
Answer: Long Hairs
Explanation:
Seeds with long hairs (e.g., cotton) cling to animals, humans, or wind, aiding in dispersal.
326. Hemoglobin-Like Molecule in Plants:
Answer: Cytochrome
Explanation:
Cytochromes in plant cells transport electrons during cellular respiration, similar to hemoglobin’s oxygen transport in animals.
327. Energy in “Sweetex” Used By Diabetic Patients:
Answer: 5 Calories
Explanation:
Artificial sweeteners like Sweetex provide minimal caloric value, allowing blood sugar control in diabetic diets.
328. Study of Chromosome Morphology Best During:
Answer: Metaphase
Explanation:
Chromosomes are most condensed and visible during metaphase, making it ideal for karyotype analysis.
329. Animal of AB Blood Group:
Answer: Camel
Explanation:
Certain camels exhibit AB blood group characteristics; camelids have unique immunological blood properties.
330. Longest Worm:
Answer: Tapeworm
Explanation:
Tapeworms (cestodes) are parasitic flatworms, some reaching several meters in length inside host intestines.
331. Clones in Animals Obtained By:
Answer: Micropropagation
Explanation:
Cloning involves creating genetically identical organisms or tissues using micropropagation or tissue culture techniques.
332. Classification System of Carolus Linnaeus:
Answer: Binomial Nomenclature
Explanation:
Linnaeus introduced binomial nomenclature, giving each species a two-part Latin name (genus + species).
333. Insectivorous Plant Among Below:
Answer: Drosera
Explanation:
Drosera (sundew) traps insects using sticky secretions to obtain nutrients in nutrient-poor soils.
334. Acid Stored in Batteries:
Answer: Sulfuric Acid
Explanation:
Lead-acid batteries use concentrated sulfuric acid as the electrolyte to store and release electrical energy.
335. Study of Blood Called:
Answer: Hematology
Explanation:
Hematology examines blood composition, diseases, and disorders like anemia, leukemia, and clotting defects.
336. Alternative Term for Uterus:
Answer: Womb
Explanation:
The uterus (womb) is the female reproductive organ where the embryo implants and develops during pregnancy.
337. Correcting Hypermetropia:
Answer: Convex (Converging) Lens
Explanation:
Convex lenses converge light onto the retina, correcting farsightedness (hypermetropia).
338. Plant Breeders Use Biotech To Overcome:
Answer: Micronutrient and Vitamin Deficiency
Explanation:
Biofortification in plants addresses nutrient deficiencies, improving the content of essential vitamins and minerals.
339. Plants Absorb Nitrogen In Form Of:
Ans: Nitrates
Explanation:
Plants primarily absorb nitrogen from the soil as nitrate (NO₃⁻) ions for protein and nucleic acid synthesis.
340. Instrument used to measure stem growth rate — Auxanometer
Explanation: Measures growth of plant stems by recording changes in length over time due to cell elongation.
341. Harmful substance in tobacco smoke — Nicotine
Explanation: Nicotine is an addictive alkaloid that affects the nervous system and causes increased heart rate and blood pressure.
342. Pancreas secretes which hormone ? — Insulin
Explanation: Insulin regulates blood sugar levels by converting excess glucose into glycogen for storage in the liver.
343. Yellowish color of cow’s milk is due to — Carotene
Explanation: Carotene is a natural pigment that gives milk a light yellow tint and also serves as a precursor to vitamin A.
344. Transplant between genetically identical individuals — Isograft
Explanation: Isograft occurs between identical twins or clones; since genes are identical, rejection chances are minimal.
345. Lactose is found in — Milk
Explanation: Lactose is a natural sugar (disaccharide) found in milk; it provides energy and aids calcium absorption.
346. Meiosis occurs in — Reproductive cells
Explanation: Meiosis reduces chromosome number by half, forming gametes (sperm and egg) for sexual reproduction.
347. Study of cells is called — Cytology
Explanation: Cytology focuses on cell structure, function, and composition — the basic unit of all living organisms.
348. Proteins are digested by — Protease
Explanation: Protease enzymes break down complex proteins into amino acids, aiding nutrient absorption in the small intestine.
349. Xerophthalmia is caused by deficiency of — Vitamin A
Explanation: Lack of Vitamin A leads to dryness of the eyes, corneal damage, and night blindness.
350. Stomatal opening is based on — Endosmosis
Explanation:Water enters guard cells by endosmosis, making them turgid and opening the stomatal pore for gas exchange.