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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 1351. |
Expulsion of urine become voluntary when it is present in: |
| A. | Urethra |
| B. | Ureters |
| C. | Urinary bladder |
| D. | Pelvis of kidneys |
| Answer» D. Pelvis of kidneys | |
| 1352. |
Out of the four parts given below, which parts plays significant role in forming concentrated urine in human? (i) Loop of Henle (ii) Glomerulus (iii) Bowman's capsule (iv) Vasa recta |
| A. | (i) and (ii) |
| B. | (iii) and (iv) |
| C. | (ii) and (iii) |
| D. | (i) and (iv) |
| Answer» E. | |
| 1353. |
If the human kidneys filter 150 litres of plasma in a 24 hour period, what is the typical amount of urine produced and eliminated in that time period? |
| A. | 0.15 litres |
| B. | 1.5 litres |
| C. | 15 litres |
| D. | 30 litres |
| Answer» C. 15 litres | |
| 1354. |
The diagram shows a simplified nephron. In which regions (marked as 1,2,3,4 and 5) would cells with many microvilli and mitochondria be found? |
| A. | 1 and 5 |
| B. | 2 and 4 |
| C. | 2 and 3 |
| D. | 3 and 4 |
| Answer» D. 3 and 4 | |
| 1355. |
Synthesis of urea in liver takes place by: |
| A. | Nitrogen cycle |
| B. | Kreb's cycle |
| C. | Ornithine cycle |
| D. | Glycolysis |
| Answer» D. Glycolysis | |
| 1356. |
Which of the following hormone/enzyme is /are correctly paired with its function? (i) Renin - Enzyme that catalyses the formation of angiotensin I. (ii) Aldosterone ? Regulates water reabsorption at the distal convoluted tubule. (iii) Anti-diuretic hormone (ADH) - It is a powerful vasoconstrictor that stimulates the secretion of aldosterone. (iv) Angiotensin II ? Promotes reabsorption of sodium at distal convoluted tubule. |
| A. | Only (i) |
| B. | Only (iii) |
| C. | (i), (ii) and (iii) |
| D. | (ii), (iii) and (iv) |
| Answer» B. Only (iii) | |
| 1357. |
Select the correct match of the types of organs given in column-I with their role in excretion given in column-II. Column-I Column-II A. Lungs I. Secretes bile containing substances like bilirubin, biliverdin, cholesterol, degraded steroid hormones, vitamins and drugs. B. Liver II. Eliminates water and salts in sweat and substances like sterols, hydrocarbons and waxes through sebum. C. Skin III. Remove large amounts of \[C{{O}_{2}}\](18litres/day) and also significant quantities of water every day. D. Kidney IV. Remove wastes (metabolic by products and regulate pH, ion concentration, volume and osmolarity of blood. |
| A. | A-I; B-II; C-III; D-IV |
| B. | A-III; B-I; C-II; D-IV |
| C. | A-III; B-I; C-IV; D-II |
| D. | A-IV; B-II; C-III; D-I |
| Answer» C. A-III; B-I; C-IV; D-II | |
| 1358. |
The hormone that promotes reabsorption of water from glomerular filtrate is: |
| A. | Oxytocin |
| B. | Vasopressin |
| C. | Calcitonin |
| D. | Relaxin |
| Answer» C. Calcitonin | |
| 1359. |
Human sweat does not contain: |
| A. | Lactic acid |
| B. | Glucose |
| C. | Amino acids |
| D. | Uric acid |
| Answer» E. | |
| 1360. |
Glomerulus and Bowman's capsule constitute: |
| A. | Nephrotome |
| B. | Renal corpuscle |
| C. | Renal capsule |
| D. | Malpighian tubule |
| Answer» C. Renal capsule | |
| 1361. |
Liquid part of the blood having undergone ultrafiltration from the glomerulus and reaching Bowman's capsule normally would not contain: |
| A. | Sugar (glucose) |
| B. | Sodium chloride |
| C. | Creatinine |
| D. | Albumin |
| Answer» E. | |
| 1362. |
Which organ of earthworm is analogous to our kidney? |
| A. | Clitellum |
| B. | Nephridium |
| C. | Flame cell |
| D. | Typhlosole |
| Answer» C. Flame cell | |
| 1363. |
Flame cells are excretory organs of: |
| A. | Prawn |
| B. | Planaria |
| C. | Silver Fish |
| D. | Hydra |
| Answer» C. Silver Fish | |
| 1364. |
On a cold day, blood vessels in the skin: |
| A. | Dilate, allowing blood to keep the skin warm. |
| B. | Constrict, forcing blood to flow through vessels in the skin. |
| C. | Constrict, reducing heat loss from blood at the surface. |
| D. | Dilate, causing blood to pass through the cold skin more quickly. |
| Answer» D. Dilate, causing blood to pass through the cold skin more quickly. | |
| 1365. |
Which of the following statements about the excretory system of insects is not true? |
| A. | Active transport moves materials from the coelomic fluid into the Malpighian tubules. |
| B. | The Malpighian tubules can produce a highly concentrated urea solution, allowing insects to inhabit some of Earth's driest habitats. |
| C. | Reabsorption of salts takes place mostly in the gut. |
| D. | Water reabsorption is by osmotic movement only. |
| Answer» C. Reabsorption of salts takes place mostly in the gut. | |
| 1366. |
Consider the following statements and choose the correct option. (i) Flame cells are excretory structures in flatworms. (ii) Green glands are excretory organs in annelids. (iii) Columns of Bertini are the conical projections of renal pelvis into renal medulla between the renal pyramids. |
| A. | (i) and (ii) are correct |
| B. | (ii) and (iii) are incorrect |
| C. | (i) and (iii) are correct |
| D. | (i), (ii) and (iii) are correct |
| Answer» C. (i) and (iii) are correct | |
| 1367. |
Healthy human does not excrete out in his urine: |
| A. | Uric acid |
| B. | Alanine |
| C. | Creatinine |
| D. | B-complex vitamins |
| Answer» C. Creatinine | |
| 1368. |
Bowman's capsule is lined by: |
| A. | Ciliated cuboidal epithelium |
| B. | Squamous epithelium |
| C. | Non-ciliated cuboidal epithelium |
| D. | Non-ciliated columnar epithelium |
| Answer» C. Non-ciliated cuboidal epithelium | |
| 1369. |
Filtration pressure in human Kidneys is about: |
| A. | +15 mm Hg |
| B. | +70 mm Hg |
| C. | +45 mm Hg |
| D. | +55 mm Hg |
| Answer» B. +70 mm Hg | |
| 1370. |
"Columns of Bertini" in the kidney of mammals are formed as the extension of: |
| A. | Medulla into cortex |
| B. | Cortex into medulla |
| C. | Medulla into pelvis |
| D. | Pelvis into ureter |
| Answer» C. Medulla into pelvis | |
| 1371. |
The glomerular nitrate consists of: |
| A. | Urea, sodium chloride, fibrinogen and water |
| B. | Glucose, amino acids, urea, oxytocin and calcitonin |
| C. | Both [a] and [b] |
| D. | Urea, glucose, salts and water |
| Answer» E. | |
| 1372. |
Urine contains how much of water? |
| A. | 96% |
| B. | 0.9 |
| C. | 70% |
| D. | None of these |
| Answer» B. 0.9 | |
| 1373. |
A man takes large amount of protein. He is likely to excrete more amount of: |
| A. | Water |
| B. | Glucose |
| C. | Urea and uric acid |
| D. | Salts |
| Answer» D. Salts | |
| 1374. |
In which one of the following ways does the blood leaving the glomerulus of mammalian kidney tubule differ from the blood entering the glomerulus? |
| A. | It has a lower concentration of plasma proteins. |
| B. | It contains fewer corpuscles per unit volume. |
| C. | It has a lower concentration of crystalloids |
| D. | It has a higher concentration of crystalloid, |
| Answer» D. It has a higher concentration of crystalloid, | |
| 1375. |
If the afferent arteriole that supplies blood to the glomerulus becomes dilated: |
| A. | The protein concentration of the nitrate decreases. |
| B. | Hydrostatic pressure in the glomerulus decreases. |
| C. | The glomerular nitration rate increases. |
| D. | All of the above |
| Answer» D. All of the above | |
| 1376. |
Match the column-I with column-II and choose the correct option. Column-I (Excretory organs) Column-II (Animals) A. Nephridia I. Hydra B. Malpighian tubules II. Leech C. Protonephridia III. Shark D. Kidneys IV. Round worms V. Cockroach |
| A. | A-II; B-V; C-IV; D-III |
| B. | A-IV; B-II; C-I; D-V |
| C. | A-V; B-II; C-IV; D-III |
| D. | A-II; B-IV; C-V; D-I |
| Answer» B. A-IV; B-II; C-I; D-V | |
| 1377. |
Refer the following diagram and identify the parts of a kidney indicated as 1, 2, 3, 4 and 5. |
| A. | 1 - cortex, 2 - nephron, 3 - pelvis, - medulla, 5 - ureter |
| B. | 1 - cortex, 2 - medulla, 3 - nephron, - pelvis, 5 - ureter |
| C. | 1 - nephron, 2 - cortex, 3 - medulla, - ureter, 5 - pelvis |
| D. | 1 - nephron, 2 - cortex, 3 - medulla, - pelvis, 5 - ureter |
| Answer» E. | |
| 1378. |
The voluntary response to the distension of urinary bladder is: |
| A. | Polyurea |
| B. | Micturition |
| C. | Mellitus |
| D. | Menstruation |
| Answer» C. Mellitus | |
| 1379. |
If the diameter of afferent renal arteriole is decreased and that of efferent renal arteriole increased, ultra filtration will: |
| A. | Be faster |
| B. | Be slower |
| C. | Not take place |
| D. | Take place in the same speed |
| Answer» D. Take place in the same speed | |
| 1380. |
In hot weather the urine becomes more concentrated and darker in colour, due to: |
| A. | Dehydration |
| B. | Rehydration |
| C. | Absorption of aldosterone |
| D. | Absence of renin |
| Answer» B. Rehydration | |
| 1381. |
Directions for (Qs. 96 to 99): Refer the given figure of nephron showing blood vessels and duct and answer the questions. Which structures have an ability to produce the concentrated urine? |
| A. | 1, 2, 3 |
| B. | 3, 4, 5 |
| C. | 6, 7, 8 |
| D. | 2, 4, 7 |
| Answer» C. 6, 7, 8 | |
| 1382. |
In human beings the capsular urine entering the Proximal Convoluted Tubule (PCT) is: |
| A. | Isotonic to blood |
| B. | Hypotonic to blood |
| C. | Hypertonic to blood |
| D. | Isotonic to sea water |
| Answer» B. Hypotonic to blood | |
| 1383. |
Blood plasma contains proteins but glomerular filtrate does not. Why does this difference in composition occur? |
| A. | Blood osmotic pressure is maintained by the presence of plasma proteins. |
| B. | Proteins are actively transported from the kidney tubule back into the blood capillaries. |
| C. | Proteins cannot pass through the membranes of the glomerular capillaries. |
| D. | There is a high hydrostatic pressure in the blood within the glomerular capillaries. |
| Answer» E. | |
| 1384. |
The loops of Henie in the kidneys of a desert kangaroo rat are much longer than those in a white laboratory rat because the: |
| A. | Kangaroo rat lives in an environment where water is scarce. |
| B. | White rat's diet is much less varied than the kangaroo rat's. |
| C. | Kangaroo rat cannot always find food. |
| D. | Kangaroo rat produces more body wastes. |
| Answer» B. White rat's diet is much less varied than the kangaroo rat's. | |
| 1385. |
Waste products of adenine and guanine metabolism are excreted by man as: |
| A. | Ammonia |
| B. | Urea |
| C. | Uric acid |
| D. | Allantois |
| Answer» D. Allantois | |
| 1386. |
What was the earliest hominid to have an enlarged brain (relative to body size)? |
| A. | Neanderthal |
| B. | Homo habilis |
| C. | Australopithecus |
| D. | Homo erectus |
| Answer» C. Australopithecus | |
| 1387. |
The given figure provides an example of: |
| A. | Convergent evolution |
| B. | Parallel evolution |
| C. | Recapitulation |
| D. | Divergent evolution |
| Answer» E. | |
| 1388. |
Suppose that a new fossil hominid is discovered. What criterion can be used to determine where in the human evolutionary lineage this new fossil belongs? |
| A. | Brain size |
| B. | Tooth structure |
| C. | Foot structure |
| D. | All of these |
| Answer» E. | |
| 1389. |
The theory of natural selection, proposed by Darwin to explain Organic Evolution was based on: |
| A. | Modifications of organs through use and disuse. |
| B. | Enormous rate of reproduction, struggle for existence and survival of the fittest. |
| C. | Inheritance of acquired characters. |
| D. | Appearance of sudden large variations, inheritance and survival of those having these variations. |
| Answer» C. Inheritance of acquired characters. | |
| 1390. |
Most modem breeds of domestic dogs are evolved by: |
| A. | Natural selection |
| B. | Artificial selection |
| C. | Sexual selection |
| D. | Reproductive isolation |
| Answer» C. Sexual selection | |
| 1391. |
The smallest unit that can evolve, is a: |
| A. | Species |
| B. | Genotype |
| C. | Gene |
| D. | Population |
| Answer» E. | |
| 1392. |
The diagram (A and B) given below shows the skull of two different mammals. Which of the following accurately describes the differences between these skulls? |
| A. | Skull A has more teeth than skull B. |
| B. | Skull A has more brain capacity than skull B. |
| C. | Skull A is of a human and skull B is of an ape. |
| D. | Skull A is of an ape and skull B is of human. |
| Answer» E. | |
| 1393. |
Match the column-I with column-II and select the correct option. Column-I (Name of the Scientist) Column-II (Contributions) A. Charles Darwin I. Mutation theory B. Lamarck II. Germ plasm theory C. Hugo De Vries III. Philosophie Zoologique D. Ernst Haeckel IV. The Origin of species E. August Weismann V. Biogenetic law F. VI. Essay on population |
| A. | A-IV; B-III; C-I; D-V; E-II |
| B. | A-IV; B-III; C-V; D-I; E-VI |
| C. | A-IV; B-VI; C-V; D-III; E-I |
| D. | A-II; B-III; C-I; D-V; E-II |
| Answer» B. A-IV; B-III; C-V; D-I; E-VI | |
| 1394. |
Select the correct statement(s). (i) Adaptative ability is inherited. (ii) Adaptative ability has a genetic basis. (iii) Fitness is the end result of the ability to adapt and get selected by nature. |
| A. | (i), (ii) and (iii) |
| B. | None of these |
| C. | Only (i) and (iii) |
| D. | Only (ii) |
| Answer» B. None of these | |
| 1395. |
Identify the correct conclusion regarding the given statements. (i) There are patterns in the fossil record that suggest other species have diverged from a single ancestor species. (ii) There are biogeographic patterns in the distribution of species, for instance distinct bird species on an island tend to resemble one another, suggesting a common ancestor. (iii) There are common stages in the early embryological development of organisms representing several distinct vertebrate groups. (iv) Anatomical structures, such as forelimbs, in different groups appear to be modified versions of structures that might have been present in a common ancestor. |
| A. | These are the example of a macro evolutionary process. |
| B. | They are the evidences for Lamarck's theory of inheritance. |
| C. | They are the evidences for Darwin's theory of common descent |
| D. | They are the examples of natural selection which occurs within populations, where artificial selection does not occur. |
| Answer» D. They are the examples of natural selection which occurs within populations, where artificial selection does not occur. | |
| 1396. |
The evolution occurring at a genetic level is called: |
| A. | Macroevolution |
| B. | Megaevolution |
| C. | Inorganic evolution |
| D. | Microevolution |
| Answer» E. | |
| 1397. |
A population of organisms has a gene for which there are two alleles, D and d. The allele frequency of D = 0.8. If this population satisfies all five of the Hardy-Weinberg conditions, what are the genotype frequencies that are expected in the next generation? |
| A. | DD = 0.04; Dd = 0.32; dd = 0.64 |
| B. | DD = 0.64; Dd = 0.32; dd = 0.64 |
| C. | DD = 0.04; Dd= 0.64; dd= 0.32 |
| D. | DD = 0.64; Dd = 0.32; dd = 0.04 |
| Answer» E. | |
| 1398. |
In primordial atmosphere, when the living, organism evolved, the respiration process was: |
| A. | Anaerobic as it released more energy. |
| B. | Aerobic as it was more complex. |
| C. | Aerobic as it released more energy. |
| D. | Anaerobic because early atmosphere contained little or no oxygen. |
| Answer» E. | |
| 1399. |
Most biologists think that RNA was the first genetic material because: |
| A. | Amino acids were produced in Stanley Miller's apparatus. |
| B. | DNA is the universal genetic material of eukaryotes. |
| C. | Existence of ribozymes suggests RNA was used to catalyse chemical reations. |
| D. | RNA is simpler than DNA. |
| Answer» D. RNA is simpler than DNA. | |
| 1400. |
A geneticist mixed together many different kinds of fruit flies-some with long wings, some with short wings, some with red eyes, some with .brown eyes, and so on. He allowed the flies to feed, mate randomly, and reproduce by the millions. After many generations, most of the flies in the population had medium wings and red eyes, and most of the extreme types had disappeared. This experiment appears to demonstrate: |
| A. | Stabilising selection |
| B. | Geographic variation |
| C. | Diversifying selection |
| D. | Genetic drift |
| Answer» B. Geographic variation | |