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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.
| 1501. |
Energy flow and energy transformations in living systems strictly confirm to the: |
| A. | Law of limiting factors |
| B. | Liebig's law of minimum |
| C. | Laws of thermodynamics |
| D. | Shelford's law of tolerance |
| Answer» D. Shelford's law of tolerance | |
| 1502. |
Which of the following could not be considered an ecosystem? |
| A. | A small pond |
| B. | All the fish in a coral reef |
| C. | Earth |
| D. | A pile of dung in a pasture |
| Answer» C. Earth | |
| 1503. |
The lentic ecosystem includes which of following water? |
| A. | Rain |
| B. | Running |
| C. | Standing |
| D. | Gravitational |
| Answer» D. Gravitational | |
| 1504. |
The two vegetations of an ecosystem are separated by: |
| A. | Ecesis |
| B. | Ecoline |
| C. | Ecophane |
| D. | Ecosystem |
| Answer» C. Ecophane | |
| 1505. |
Benthos of pond ecosystem are: |
| A. | Producers |
| B. | Primary consumers |
| C. | Secondary consumers |
| D. | Tertiary consumers |
| Answer» C. Secondary consumers | |
| 1506. |
Which of the following organism types would probably rank the highest in terms of their expected efficiency of energy transfer between trophic levels? |
| A. | Herbivorous mammal |
| B. | Carnivorous mammal |
| C. | Invertebrate herbivore |
| D. | Invertebrate carnivore |
| Answer» B. Carnivorous mammal | |
| 1507. |
In a food web, each successive trophic level has: |
| A. | increased total energy |
| B. | less total energy content |
| C. | more total energy content |
| D. | non-estimated energy content |
| Answer» C. more total energy content | |
| 1508. |
Decomposers such as fungi and bacteria are vital to the ecosystem because they: |
| A. | are the primary organic recyclers. |
| B. | are the terminal energy consumers. |
| C. | keep populations in check. |
| D. | Both [a] and [b] |
| Answer» E. | |
| 1509. |
The free floating organisms, of an open sea and shore, are collectively called: |
| A. | Planktons |
| B. | Nektons |
| C. | Benthoic |
| D. | Sea anemone |
| Answer» B. Nektons | |
| 1510. |
Productivity at the second trophic level is always: |
| A. | greater than the productivity at the first trophic level always. |
| B. | less than the productivity at the first trophic level. |
| C. | equal to the productivity at the first trophic level. |
| D. | extremely variable compared to the productivity at the first trophic level. |
| Answer» C. equal to the productivity at the first trophic level. | |
| 1511. |
Because of limitations on resources, organisms must ____ materials in order to survive. |
| A. | Reuse |
| B. | Reinvent |
| C. | Reintroduce |
| D. | Recycle |
| Answer» E. | |
| 1512. |
Which of the following statement are correct? (i) Deserts and deep lakes show least productivity. (ii) 10g by mass is passed to the next trophic level in the food chain. (iii) Most productive ecosystem is coral reef. (iv) Sugarcane is the most productive crop. Choose the correct option. |
| A. | (i) and (iv) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i), (iii) and (iv) |
| Answer» E. | |
| 1513. |
Which one of the following statement is correct about decomposition? |
| A. | Decomposition rate is slower if detritus is rich in lignin and chitin, and quicker if detritus is rich in nitrogen and water - soluble substances like sugars. |
| B. | Decomposition rate is slower if detritus is rich in nitrogen and water - soluble substances like sugars, and quicker if detritus is rich in lignin and chitin. |
| C. | Decomposition rate is slower if detritus is rich in cellulose, and quicker if detritus is rich in phosphorus. |
| D. | Decomposition rate is quicker if detritus is rich in lignin, and lower if detritus is rich in sulphur. |
| Answer» B. Decomposition rate is slower if detritus is rich in nitrogen and water - soluble substances like sugars, and quicker if detritus is rich in lignin and chitin. | |
| 1514. |
Energy flow through an ecosystem differs from nutrient flow in that: |
| A. | energy flow is linear, |
| B. | nutrient flow is linear. |
| C. | energy flow is cyclical. |
| D. | energy builds as it flows through the ecosystem. |
| Answer» B. nutrient flow is linear. | |
| 1515. |
The pyramid of number in grassland ecosystem is: |
| A. | Linear |
| B. | Inverted |
| C. | Upright |
| D. | Negative |
| Answer» D. Negative | |
| 1516. |
Phosphorus usually becomes a limiting factor at certain times of the year in: |
| A. | Aquatic ecosystem |
| B. | Grassland ecosystem |
| C. | Forest ecosystem |
| D. | All of the above |
| Answer» B. Grassland ecosystem | |
| 1517. |
The process by which a lake ecosystem is altered by eutrophication involves several stages, each causing the next. Which of the following stages would occur second in the chain of causation? |
| A. | Algal blooms occur. |
| B. | Oxygen levels drop in deeper water. |
| C. | Phosphorus input from sewage and agricultural runoff increases. |
| D. | Respiratory demand from decomposers increases. |
| Answer» B. Oxygen levels drop in deeper water. | |
| 1518. |
The driving force for an ecosystem is: |
| A. | Biomass |
| B. | Producers |
| C. | Carbohydrates in producers |
| D. | Solar energy |
| Answer» D. Solar energy | |
| 1519. |
The largest ecosystem to the world is: |
| A. | Forests |
| B. | Grasslands |
| C. | Great lakes |
| D. | Oceans |
| Answer» E. | |
| 1520. |
When breast feeding is replaced by less nutritive food, low in proteins and calories; the infants below the age of one year are likely to suffer from: |
| A. | Pellagra |
| B. | Marasmus |
| C. | Rickets |
| D. | Kwashiorkor |
| Answer» C. Rickets | |
| 1521. |
Lathyrism due to consumption of khesri dal is characterised by: |
| A. | Skeletal deformation and thinning of collagen fibres. |
| B. | Skeletal abnormalities, diabetes mellitus and reproductive failure. |
| C. | Retarded growth, precocious puberty and renal dysfunction. |
| D. | Cardiovascular abnormalities mental retardation and delayed puberty. |
| Answer» B. Skeletal abnormalities, diabetes mellitus and reproductive failure. | |
| 1522. |
Gaucher's disease is related to: |
| A. | Abnormal fat metabolism |
| B. | Vitamin deficiency |
| C. | Disturbed carbohydrate metabolism |
| D. | Abnormal protein metabolism |
| Answer» B. Vitamin deficiency | |
| 1523. |
A dental disease characterised by mottling of teeth due to ingredient in drinking water, namely: |
| A. | Fluorine |
| B. | Chlorine |
| C. | Boron |
| D. | Mercury |
| Answer» B. Chlorine | |
| 1524. |
Mental retardation in children suffering from galactosemia can be avoided by: |
| A. | Giving them more milk. |
| B. | Giving them milk free diet. |
| C. | Giving them milk fortified with vitamin. |
| D. | Giving them more proteinaceous diet. |
| Answer» C. Giving them milk fortified with vitamin. | |
| 1525. |
Certain amino acids are essential to the diet of animals because: |
| A. | They prevent over-nourishment. |
| B. | They are cofactors and coenzymes that are required for normal physiological function. |
| C. | An animal cannot directly synthesise them through the transfer of an amino group to an appropriate carbon skeleton. |
| D. | Animals need these substances in order to make the stored fats that are used during hibernation and migration. |
| Answer» D. Animals need these substances in order to make the stored fats that are used during hibernation and migration. | |
| 1526. |
Ampulla of Vater is guarded by: |
| A. | Sphincter of Oddi |
| B. | Pyloric sphincter |
| C. | Cardiac sphincter |
| D. | Anal sphincter |
| Answer» B. Pyloric sphincter | |
| 1527. |
The common bile duct in human is formed by the joining of: |
| A. | Pancreatic duct and bile duct |
| B. | Cystic duct and hepatic duct |
| C. | Cystic duct and pancreatic duct |
| D. | Hepatic duct and pancreatic duct |
| Answer» C. Cystic duct and pancreatic duct | |
| 1528. |
Riboflavin deficiency causes which disease? |
| A. | Scurvy |
| B. | Pellagra |
| C. | Beriberi |
| D. | Cheilosis |
| Answer» E. | |
| 1529. |
Osteomalacia in adults is caused due to the deficiency of: |
| A. | Vitamin D |
| B. | Vitamin C |
| C. | Vitamin A |
| D. | Vitamin K |
| Answer» B. Vitamin C | |
| 1530. |
In ruminants, bacterial action occurs in: |
| A. | Reticulum |
| B. | Omasum |
| C. | Abomasum |
| D. | Rumen |
| Answer» E. | |
| 1531. |
It is important to get some vitamin \[{{B}_{1}}\] every day but it is all right if intake of vitamin A varies a bit. Why? |
| A. | Vitamin \[{{B}_{1}}\] is an essential nutrient, and vitamin A is not. |
| B. | Vitamin A can be stored by the body, but vitamin \[{{B}_{1}}\] cannot. |
| C. | The body needs much larger amounts of vitamin \[{{B}_{1}}\] than vitamin [A]. |
| D. | The body requires vitamin\[{{B}_{1}}\], but vitamin A is just an extra vitamin. |
| Answer» C. The body needs much larger amounts of vitamin \[{{B}_{1}}\] than vitamin [A]. | |
| 1532. |
Dental formula shows type and number of teeth in: |
| A. | Upper jaw |
| B. | Lower jaw |
| C. | Both jaws |
| D. | One half of both jaws |
| Answer» E. | |
| 1533. |
During prolonged fasting, |
| A. | First fats are used up, followed by carbohydrates from liver and muscles and proteins in the end. |
| B. | First carbohydrates are used up, followed by fat and proteins towards end. |
| C. | First lipids, followed by proteins and carbohydrates towards end. |
| D. | None of the above |
| Answer» C. First lipids, followed by proteins and carbohydrates towards end. | |
| 1534. |
The given pair represent substrate-enzyme pair. Which of the following pair is (are) correct? (i) Maltose Lactase (ii) Protein Pepsin (iii) Carbohydrate Lipase (iv) Casein Rennin |
| A. | (i) and (ii) |
| B. | (i) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» E. | |
| 1535. |
Match column-I (organs) with column-II (functions) and choose the correct option. Column-I Column-II A. Mouth I. Reclaims water and salts. B. Stomach II. Carries out most of the digestion and absorption of nutrients. C. Small intestine III. Releases amylase enzyme that break down carbohydrates. D. Large intestine IV. An acidic compartment that begins to break proteins into larger polypeptides. |
| A. | A-I; B-II; C-III; D-IV |
| B. | A-III; B-IV; C-II; D-I |
| C. | A-II; B-III; C-I; D-IV |
| D. | A-IV; B-I; C-II; D-III |
| Answer» C. A-II; B-III; C-I; D-IV | |
| 1536. |
If for some reason our goblet cells becomes non- functional then this will adversely affect: |
| A. | Production of somatostatin. |
| B. | Secretion of sebum from the sebaceous glands. |
| C. | Maturation of sperms. |
| D. | Smooth movement of food, down the intestine. |
| Answer» E. | |
| 1537. |
If the bile-pancreatic duct is blocked then which of the following will not be affected? |
| A. | Digestion of proteins |
| B. | Emulsification of fats |
| C. | Level of blood glucose |
| D. | Digestion of starch |
| Answer» D. Digestion of starch | |
| 1538. |
In pancreatic juice, which of the followings are secreted in inactive form as proenzymes? |
| A. | Trypsin, chymotrypsin, & carboxypeptidases |
| B. | Pepsin, trypsin and chymotrypsin |
| C. | Trypsin only |
| D. | Trypsin and chymotrypsin only |
| Answer» B. Pepsin, trypsin and chymotrypsin | |
| 1539. |
Valves of Kerckring (also called plicae circulares or valvulae conniventes) occur in: |
| A. | Between right auricle and right ventricle. |
| B. | Left auricle and left ventricle. |
| C. | Stomach and duodenum. |
| D. | Intestine. |
| Answer» E. | |
| 1540. |
Match column-I with column-II and select the correct answer using the codes given below. Column-I Column-II A. Hepatic lobule I. Base of Villi B. Crypts of Lieberkuhn II. Glisson's capsule C. Crypts of Lieberkuhn III. Gall bladder D. Cystic duct IV. Hepato - pancreatic duct |
| A. | A-II; B-I; C-IV; D-III |
| B. | A-I; B-II; C-IV; D-III |
| C. | A-I; B-II; C-III; D-IV |
| D. | A-III; B-IV; C-II; D-I |
| Answer» B. A-I; B-II; C-IV; D-III | |
| 1541. |
What is common among amylase, renin and trypsin? |
| A. | All are proteins. |
| B. | All are proteolytic enzymes. |
| C. | Produced in stomach. |
| D. | Act at pH lower than 7. |
| Answer» B. All are proteolytic enzymes. | |
| 1542. |
How do nutrients, absorbed by the small intestine, travel to the individual cells of the human body? |
| A. | The nutrients are absorbed from the small intestine into the blood and move through the circulatory system to the body cells. |
| B. | The nutrients move from the small intestine directly to the liver and then move through the lymphatic system to the body cells. |
| C. | The small intestine forces the nutrients into the kidneys, where the nutrients are then dissolved in fluids used by the body cells. |
| D. | The body cells send nerve impulses indicating a lack of nutrients to the small intestine, and the small intestine sends the nutrients back to the cells. |
| Answer» B. The nutrients move from the small intestine directly to the liver and then move through the lymphatic system to the body cells. | |
| 1543. |
Which one of the given option represents lophodont? |
| A. | Incisors and canines |
| B. | Canines and premolars |
| C. | Premolars and molars |
| D. | Incisors and premolars |
| Answer» D. Incisors and premolars | |
| 1544. |
What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor? |
| A. | Enterokinase will not be released from the duodenal mucosa and so trypsinogen is not converted into trypsin. |
| B. | Gastric juice will be deficient in chymosin. |
| C. | Gastric juice will be deficient in pepsinogen. |
| D. | In the absence of HC1 secretion, inactive pepsinogen is not converted into the active enzyme pepsin. |
| Answer» E. | |
| 1545. |
The sphincter of Oddi is present between: |
| A. | Oesophagus and cardiac stomach. |
| B. | Pyloric stomach and duodenum. |
| C. | Hepatic duct and cystic duct. |
| D. | Hepatopancreatic duct and duodenum. |
| Answer» E. | |
| 1546. |
How many teeth in human, erupt only once in the life time? |
| A. | 4 |
| B. | 12 |
| C. | 20 |
| D. | 16 |
| Answer» C. 20 | |
| 1547. |
Sodium taurocholate aids in: |
| A. | Absorption |
| B. | Defecation |
| C. | Assimilation |
| D. | Emulsification |
| Answer» E. | |
| 1548. |
Gall bladder is attached to liver in the region of: |
| A. | Quadrate lobe |
| B. | Caudate lobe |
| C. | Right lobe |
| D. | Left lobe |
| Answer» D. Left lobe | |
| 1549. |
A "1" flap called "2" prevents the entry of food into the glottis - opening of the ??3??- during ??4??. Identify 1, 2, 3, and 4. |
| A. | 1 2 3 4 Cartilaginous Epiglottis Wind pipe Swallowing |
| B. | Bony Glissons?s Stomach Digestion |
| C. | Bony Pharynx Oral cavity Ingestion |
| D. | Cartilaginous Oesophagus Trachea Mastication |
| Answer» B. Bony Glissons?s Stomach Digestion | |
| 1550. |
Which of the following is/are correct statements regarding beri-beri? (i) A crippling disease prevalant among the native population of sub-Saharan Africa. (ii) A deficiency disease caused by lack of thiamine (vitamin\[{{B}_{1}}\]). (iii) A nutritional disorder in infants and young children when the diet is persistently deficient in essential protein. (iv) Occurs in those countries where the staple diet is polished rice. (v) The symptoms are pain, paralysis, muscle, cramps, progressive oedema, mental deterioration and finally heart failure. |
| A. | (i), (ii) and (v) |
| B. | (i), (ii) and (iv) |
| C. | (i), (iii) and (v) |
| D. | (ii), (iii) and (v) |
| Answer» B. (i), (ii) and (iv) | |