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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.
| 14001. |
Directions for (Qs. 96 to 99): Refer the given figure of nephron showing blood vessels and duct and answer the questions. Which part is capable of reabsorption of \[HC{{O}^{-}}_{3}\] and selective secretion of hydrogen and potassium ions and \[N{{H}_{3}}\] to maintain the pH and sodium-potassium balance in blood? |
| A. | 1 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» E. | |
| 14002. |
Directions for (Qs. 96 to 99): Refer the given figure of nephron showing blood vessels and duct and answer the questions. Cells of which part is lined by simple cuboidal brush border epithelium that increases the surface area for reabsorption? Identify the name also. |
| A. | 3-Descending limb of loop of HenIe |
| B. | 5-Vasa recta |
| C. | 6-Proximal convoluted tubule |
| D. | 7-Collecting duct |
| Answer» D. 7-Collecting duct | |
| 14003. |
Directions for (Qs. 96 to 99): Refer the given figure of nephron showing blood vessels and duct and answer the questions. Which parts in the given figure have minimum reabsorption and play a significant role in the maintenance of high osmolarity of medullary interstitial fluid? |
| A. | 1 and 2 |
| B. | 3 and 4 |
| C. | 5 and 6 |
| D. | 7 and 8 |
| Answer» C. 5 and 6 | |
| 14004. |
Following are four statements. Find out the correct combination. (i) Glucose has high threshold value. (ii) Urine is concentrated in Henle's loop. (iii) Haemodialyser removes urea, uric acid, glucose and proteins. (iv) In glomerulus, urea, uric acid, water, glucose and plasma proteins are filtered out. |
| A. | (i), (iii), (iv) |
| B. | (ii), (iii), (iv) |
| C. | (i), (ii) |
| D. | (i), (iii) |
| Answer» D. (i), (iii) | |
| 14005. |
The given diagram represents a kidney nephron. At which position (marked as 1, 2, 3, 4, 5 and 6) does antidiuretic hormone (ADH) affect the permeability of membranes to water? |
| A. | 1 and 2 |
| B. | 3 and 4 |
| C. | 2 and 3 |
| D. | 5 and 6 |
| Answer» E. | |
| 14006. |
If Henle's loop were absent from mammaliar nephron then which of the following is to be expected? |
| A. | There will be no urine formation. |
| B. | There will be hardly any change in the quality and quantity of urine formed. |
| C. | The urine will be more concentrated. |
| D. | The urine will be more diluted. |
| Answer» E. | |
| 14007. |
In distal convoluted tubule of the nephrons: |
| A. | \[N{{a}^{+}}\] reabsorption requires energy. |
| B. | Secretion of \[{{K}^{+}}\] ions does not require energy. |
| C. | Water reabsorption requires energy. |
| D. | Ammonia is secreted. |
| Answer» B. Secretion of \[{{K}^{+}}\] ions does not require energy. | |
| 14008. |
In which part of excretory system of mammals can you first use the term 'urine' for contained fluid? |
| A. | Bowman's capsule |
| B. | Loop of Henle |
| C. | Collecting tubule |
| D. | Urinary bladder |
| Answer» D. Urinary bladder | |
| 14009. |
In the renal tubules, the permeability of the distal convoluted tubule and collecting duct to water is controlled by: |
| A. | Aldosterone |
| B. | Vasopressin |
| C. | Growth hormone |
| D. | Renin |
| Answer» C. Growth hormone | |
| 14010. |
Antennal glands are excretory organs of: |
| A. | Moths |
| B. | Scorpions |
| C. | Spiders |
| D. | Crayfishes |
| Answer» E. | |
| 14011. |
A fall in glomerular filtration rate (GFR) activates: |
| A. | Juxtaglomerular cells to release renin. |
| B. | Adrenal cortex to release aldosterone. |
| C. | Adrenal medulla to release adrenaline. |
| D. | Posterior pituitary to release vasopressin. |
| Answer» B. Adrenal cortex to release aldosterone. | |
| 14012. |
Coxal glands are excretory organs in: |
| A. | Spiders and scorpions |
| B. | Insects |
| C. | Annelids |
| D. | Molluscs |
| Answer» B. Insects | |
| 14013. |
The number of nephrons in a kidney is equal to: |
| A. | The number of Bowman's capsules. |
| B. | Sum of Bowman's capsules and glomeruli. |
| C. | Double the number of Bowman's capsules. |
| D. | Sum of Bowman's capsules and Malpighian corpuscles. |
| Answer» B. Sum of Bowman's capsules and glomeruli. | |
| 14014. |
Colloidal osmotic pressure in blood plasma is mainly due to: |
| A. | Albumin |
| B. | Globulin |
| C. | Fibrinogen |
| D. | Sodium chloride |
| Answer» B. Globulin | |
| 14015. |
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. | |
| 14016. |
Kidney crystals are solid clusters of: |
| A. | Calcium nitrate and uric acid |
| B. | Phosphate and uric acid |
| C. | Calcium carbonate and uric acid |
| D. | Calcium metabisulphite and uric acid |
| Answer» C. Calcium carbonate and uric acid | |
| 14017. |
Glomerular nitration rate would be decreased by: |
| A. | Constriction of the efferent arteriole. |
| B. | An increase in afferent arteriolar pressure |
| C. | Compression of the renal capsule. |
| D. | An increase in renal blood flow. |
| Answer» D. An increase in renal blood flow. | |
| 14018. |
Workers in deep mines usually suffer from dehydration because: |
| A. | Water is lost due to evaporation. |
| B. | Water is lost due to defecation. |
| C. | Water is lost in the form of urine. |
| D. | Water is lost along with salts in the form of sweat. |
| Answer» E. | |
| 14019. |
Reabsorption of chloride ions from glomerular nitrate in kidney tubule occurs by: |
| A. | Active transport |
| B. | Diffusion |
| C. | Osmosis |
| D. | Brownian movement |
| Answer» C. Osmosis | |
| 14020. |
In mammalian kidneys, Bowman's capsules or Malpighian corpuscles occur in: |
| A. | Cortex |
| B. | Medulla |
| C. | Pelvis |
| D. | All of these |
| Answer» B. Medulla | |
| 14021. |
Aquatic reptiles are: |
| A. | Ammonotelic |
| B. | Ureotelic over land |
| C. | Ureotelic |
| D. | Ureotelic in water |
| Answer» D. Ureotelic in water | |
| 14022. |
Kidneys help in the conservation of useful materials and excretion of wastes and therefore they receive 20% of the heart's output of blood (as much as the heart and brain combined). On a percentage basis, which substance is most completely reabsorbed by the kidneys? |
| A. | Water |
| B. | Glucose |
| C. | Urea |
| D. | Sodium |
| Answer» C. Urea | |
| 14023. |
Bony fishes are: |
| A. | Ureotelic |
| B. | Uricotelic |
| C. | Aminotelic |
| D. | Ammonotelic |
| Answer» E. | |
| 14024. |
Osmoreceptors in the brain detect changes in blood ion concentration which can reflexively result in: |
| A. | Water retention by the kidneys. |
| B. | Water loss by the kidneys. |
| C. | Ion retention by the kidneys. |
| D. | All of the above |
| Answer» E. | |
| 14025. |
Brush border epithelium is characteristic of: |
| A. | Neck of nephron |
| B. | Collecting tube |
| C. | Proximal convoluted tubule |
| D. | All of the above |
| Answer» D. All of the above | |
| 14026. |
Accessory excretory organs of man are: |
| A. | Only skin |
| B. | Only skin and liver |
| C. | Only skin and lungs |
| D. | Skin, lungs, liver and intestine |
| Answer» E. | |
| 14027. |
Excretory products of mammalian embryo are eliminated by: |
| A. | Placenta |
| B. | Amniotic fluid |
| C. | Allantois |
| D. | Ureters |
| Answer» B. Amniotic fluid | |
| 14028. |
Which vitamin is excreted out in high quantity through urine in man? |
| A. | Vit. C |
| B. | Vit. D |
| C. | Vit. E |
| D. | Vit. K |
| Answer» B. Vit. D | |
| 14029. |
Vasa rectae are peritubular capillaries around: |
| A. | Posterior part of alimentary canal |
| B. | PCT |
| C. | Loop of Henle |
| D. | DCT |
| Answer» D. DCT | |
| 14030. |
In man, the two kidneys lie: |
| A. | At the level of ovaries. |
| B. | At the same level. |
| C. | Left kidney at a higher level than the right one. |
| D. | Right kidney at a higher level than the left one. |
| Answer» D. Right kidney at a higher level than the left one. | |
| 14031. |
Which of the following is totally reabsorbed in renal tubules? |
| A. | Na |
| B. | K |
| C. | \[{{H}_{2}}O\] |
| D. | \[{{C}_{6}}{{H}_{12}}{{O}_{6}}\] |
| Answer» E. | |
| 14032. |
Mesonephric kidney is found in: |
| A. | Aves |
| B. | Reptilia |
| C. | Fishes |
| D. | All of these |
| Answer» D. All of these | |
| 14033. |
The appearance of albumin in the urine is most likely due to: |
| A. | Increase in the blood pressure. |
| B. | Decrease in the blood osmotic corpuscles |
| C. | Damage to the Malpighian corpuscles. |
| D. | Damage to the proximal convoluted tubules. |
| Answer» D. Damage to the proximal convoluted tubules. | |
| 14034. |
If a guppy species found in a stream is placed in a lake, its colour will evolve rapidly from colourful to drab over as few as 10 generations because of the: |
| A. | Lack of food. |
| B. | Presence of additional predators in the lake. |
| C. | Temperature of the air. |
| D. | Taste of the water. |
| Answer» C. Temperature of the air. | |
| 14035. |
Consider a population with a total of 500 alleles for a specific gene. How many individuals are in this population? |
| A. | 1000 |
| B. | 500 |
| C. | 250 |
| D. | 125 |
| Answer» D. 125 | |
| 14036. |
More recent prebiotic simulations in the lab mimic conditions found in ________. |
| A. | Deep sea hydrothermal vents |
| B. | Shallow ponds |
| C. | Underside of sea ice |
| D. | All of the above. |
| Answer» B. Shallow ponds | |
| 14037. |
What is observed in evolution? |
| A. | A sudden change occurring in a population. |
| B. | Progeny with modifications. |
| C. | It is a discontinuous process. |
| D. | All of the above |
| Answer» C. It is a discontinuous process. | |
| 14038. |
Reproductive isolation is to speciation as selection is to: |
| A. | Adaptive evolution |
| B. | Hybridisation |
| C. | Ecological isolation |
| D. | Polyploidy |
| Answer» B. Hybridisation | |
| 14039. |
Reproductive isolation can occur in a number of ways, but the net effect is always the same in that: |
| A. | Hybridisation must take place before new species can form. |
| B. | It causes geographic isolation between organisms. |
| C. | The rate of speciation slows down. |
| D. | Few or no genes flow between populations. |
| Answer» E. | |
| 14040. |
When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed as _____. |
| A. | Convergent evolution |
| B. | Divergent evolution |
| C. | Microevolution |
| D. | Co-evolution |
| Answer» B. Divergent evolution | |
| 14041. |
Diversity in the type of beaks of finches adapted to different feeding habits on the Galapagos Islands, as observed by Darwin. This provides evidence for: |
| A. | Intraspecific variations |
| B. | Intraspecific competition |
| C. | Interspecific competition |
| D. | Origin of Species by natural selection |
| Answer» E. | |
| 14042. |
Cro-Magnon man was: |
| A. | Carnivorous |
| B. | Omnivorous |
| C. | Herbivorous |
| D. | Frugivorous |
| Answer» B. Omnivorous | |
| 14043. |
Ancestor of man who first stood erect was: |
| A. | Australopithecus |
| B. | Java ape man |
| C. | Peking man |
| D. | Cro-Magnon |
| Answer» B. Java ape man | |
| 14044. |
The given figure shows an example of: |
| A. | Homologous organs |
| B. | Convergent evolution |
| C. | Divergent evolution |
| D. | Both [a] and [c] |
| Answer» E. | |
| 14045. |
A new species is formed when: |
| A. | An individual with a new genotype is formed due to exchange of chromosome segments during crossing-over in gametogenesis. |
| B. | Genotypic changes accumulate in a population resulting in its reproductive isolation. |
| C. | Variants with new phenotypes are produced due to new combinations of genes during reproduction. |
| D. | Homologous chromosomes exchange segments during crossing-over in gametogenesis. |
| Answer» E. | |
| 14046. |
Match the evolution concepts given in column-I with their description given in column-II and select the correct answer. Column-I Column-II A. Mutation I. Change in population?s allele frequencies due to chance alone. B. Gene flow II. Differences is survival and reproduction among variant individuals. C. Natural selection III. Immigration, emigration change allele frequencies. D. Genetic drift IV. Source of new alleles. |
| A. | A-I; B-II; C-III; D-IV |
| B. | A-IV; B-II; C-III; D-I |
| C. | A-III; B-I; C-IV; D-II |
| D. | A-IV; B-III; C-II; D-I |
| Answer» E. | |
| 14047. |
Identify the incorrect statements regarding origin of life: (i) Swan-neck flask experiment was performed by Louis Pasteur. (ii) Louis Pasteur is famous for germ theory of disease. (iii) Louis Pasteur disapproved spontaneous theory forever. (iv) Cosmozoic theory of origin of life was proposed by Richter. (v) Theory of Catasrophism was given by Georges Cuvier. |
| A. | (i), (ii) and (iv) |
| B. | (i), (ii), and (v) |
| C. | (i), (ii), (iii), (iv) and (v) |
| D. | None of the above |
| Answer» E. | |
| 14048. |
Read the following three statements (i-iii) and mark the right option. (i) The thorns in Bougainvillea and tendrils in cucurbits represent divergent evolution. (ii) The similarity in the eyes of Octopus and monkeys is the result of convergent evolution. (iii) The potato and sweet potato are the examples of homology. |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (i) and (iii) |
| D. | Only (i) is |
| Answer» B. (ii) and (iii) | |
| 14049. |
Which is thought to be the first hominid to use fire? |
| A. | Homo erectus |
| B. | Homo habilis |
| C. | Australopithecus africanus |
| D. | The Neanderthals |
| Answer» B. Homo habilis | |
| 14050. |
In human evolution, which of the following occurred before the switch to walking upright? |
| A. | Tool use |
| B. | Mastery of fire |
| C. | Spoken language |
| D. | Enhanced grasping ability |
| Answer» E. | |