MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Diagrams
Games
NEET
NEET Biology MCQ
Quiz 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Q.1
Between Breaths the intrapleural pressure is approximately …….. mm Hg less than atmospheric pressure
0%
4
0%
8
0%
1
0%
10
Explanation
Between breaths, intrapleural pressure sits at roughly 4 mm Hg below atmospheric pressure — this negative pressure is what keeps the lungs expanded against the chest wall.
Q.2
Haldane effect plays an important role in promoting carbon dioxide transport than the Bohr's effect in promoting oxygen transport because
0%
oxyhaemoglobin is a stronger acid which donates hydrogen ion which in turn displace carbon dioxide from blood
0%
carbaminohemoglobin is a stronger acid with splits into hydrogen and bicarbonate
0%
carbon dioxide is less soluble in venous blood than in arterial blood.
0%
carbon dioxide reacts with water to form carbonic acid that lowers the pH in tissues
Explanation
When haemoglobin binds oxygen in the lungs, it becomes oxyhaemoglobin — a stronger acid, which readily donates H⁺ ions. This shift in acidity pushes the carbonic acid/bicarbonate equilibrium to release CO₂ from the blood into the alveoli, making the Haldane effect a particularly efficient mechanism for CO₂ unloading.
Q.3
Identify the correct statement with reference to transport of respiratory gases by blood
0%
only oxygen is transported by blood
0%
Hemoglobin is necessary for transport of carbon dioxide and carbonic anhydrase for transport of oxygen
0%
only carbon dioxide is transported by blood
0%
haemoglobin is necessary for transport of Oxygen and carbonic anhydrase for transport of carbon dioxide
Explanation
Haemoglobin carries oxygen (as oxyhaemoglobin), while carbonic anhydrase (in red blood cells) catalyses the conversion of CO₂ and water into carbonic acid/bicarbonate, which is how most CO₂ is actually transported in the blood.
Q.4
Select the incorrect statement
0%
ADH decreases the reabsorption of water in the DCT and collecting duct
0%
A normal adult person secretes about 1.5 litres of urine in 24 hours
0%
Tubular reabsorption takes place by passive and active transport
0%
Cortical nephrons control plasma volume under normal water supply
Explanation
This is backwards: ADH (antidiuretic hormone) actually INCREASES water reabsorption in the DCT and collecting duct (that's its defining function, promoting water retention) — it does not decrease it.
Q.5
The joint found in head of upper arm and pectoral girdle is
0%
Ball and socket joint
0%
Saddle joint
0%
Hinge Joint
0%
Gliding joint
Explanation
The shoulder joint, where the head of the humerus meets the pectoral girdle, is a ball-and-socket joint, allowing a wide range of rotational movement.
Q.6
Presence of blood cells in the urine is called
0%
Uremia
0%
Hematuria
0%
hemoglobinuria
0%
Pyuria
Explanation
The presence of blood cells in urine is called hematuria. (Uremia is excess urea in the blood; hemoglobinuria is free haemoglobin, not intact cells, in urine; pyuria is pus/white blood cells in urine.)
Q.7
Which of the following statements about veins is correct
0%
Up to one third of the total blood volume is stored in the venous circulation at any given time
0%
Venous valves are an extension of the tunica media
0%
The flow of venous blood is not a major result of one's blood pressure
0%
Veins have small lumen as compared to arteries
Explanation
By the time blood reaches the venous side of circulation, most of the pressure generated by the heart's pumping has already dropped off — venous return instead relies mainly on other mechanisms like the skeletal-muscle pump, one-way valves, and the respiratory pump, rather than being driven directly by blood pressure the way arterial flow is.
Q.8
Which of the following is the function of enterogastrone
0%
It inhibits the secretion of gastric juice
0%
It stimulates the flow of pancreatic juice
0%
it regulate the flow of bile
0%
it stimulates the secretion of digestive juice in the stomach
Explanation
Enterogastrone (released from the duodenum in response to fat/acidic chyme) inhibits gastric juice secretion and slows gastric emptying, giving the small intestine time to process the incoming chyme.
Q.9
Which of the following symptoms is incorrect regarding emphysema
0%
Alveolar septa collapse
0%
Loss of elasticity In the Wall of alveolar sacs
0%
Regular coughing with thick greenish yellow sputum
0%
Surface area of gas exchange decreases
Explanation
Regular coughing with thick, greenish-yellow sputum is a hallmark of chronic bronchitis, not emphysema specifically — emphysema is characterised more by breathlessness from alveolar destruction, not heavy productive coughing. (Collapsed alveolar septa, loss of elastic recoil, and reduced surface area for gas exchange are all genuine, correct features of emphysema.)
Q.10
………. acts as a shock absorbed to cushion when Tibia and femur came together
0%
ligaments
0%
disc
0%
tendons
0%
cartilage
Explanation
Cartilage (the meniscus) sits between the femur and tibia at the knee joint, acting as a cushion that absorbs shock where the two bones meet.
Q.11
Which one of the following is not a disorder of bone
0%
Arthritis
0%
atherosclerosis
0%
rickets
0%
osteoporosis
Explanation
Atherosclerosis is a disorder of blood vessels (plaque buildup narrowing arteries), not a bone disorder — unlike arthritis, rickets, and osteoporosis, which are all genuine bone/joint conditions.
Q.12
When 2-3 drops of Benedict's Reagent are added to a urine sample and heated gently, it turns yellow. This colour change indicates that
0%
urine contains 0.5 % glucose
0%
urine contains 2% glucose
0%
urine contains 1 % glucose
0%
urine contains 1.5 % glucose
Explanation
On the standard Benedict's test colour scale (blue → green → yellow → orange → brick-red as glucose concentration rises), a yellow colour change corresponds to roughly 1% glucose in the sample.
Q.13
Which of the following causes an increase in sodium reabsorption in the distal convoluted tubule
0%
decrease in aldosterone level
0%
increase in aldosterone levels
0%
decrease in antidiuretic hormone levels
0%
increase in antidiuretic hormone levels
Explanation
Aldosterone acts on the distal convoluted tubule to increase sodium reabsorption (part of the RAAS system regulating blood volume and pressure).
Q.14
Visiting high mountain main cause altitude sickness in men living in plain areas. Prime cause of this is
0%
excess of \(CO_2\) in blood
0%
decrease deficiency of haemoglobin
0%
decreased partial pressure of oxygen
0%
increased proportion of oxygen in air
Explanation
At high altitude, the total atmospheric pressure drops, so even though oxygen still makes up about 21% of the air, its PARTIAL pressure is much lower — reducing how effectively oxygen diffuses into the blood, which is the underlying cause of altitude sickness.
Q.15
Which of the following are proteolytic enzymes
0%
Ptyalin, trypsin, pepsin
0%
Erepsin, trypsin, pepsin
0%
Lipase, erepsin, trypsin
0%
Pepsin, nuclease, nucleotidase
Explanation
Erepsin, trypsin and pepsin are all proteolytic enzymes, breaking down proteins/peptides. (Ptyalin is a starch-digesting enzyme, lipase digests fats, and nuclease/nucleotidase act on nucleic acids — none of those digest protein.)
Q.16
Which of the following statements is correct
0%
Villkinin is secreted by large intestine
0%
Succus entericus has pH of 2.8
0%
Brunner's glands are found in jejunum
0%
Argentaffin cells produce serotonin
Explanation
Argentaffin (enterochromaffin) cells in the gut lining do secrete serotonin. (Villikinin is secreted by the duodenum, not the large intestine; succus entericus is alkaline, not pH 2.8; and Brunner's glands are found in the duodenum, not the jejunum.)
Q.17
Select the incorrect match
0%
Bradycardia - slow heartbeat
0%
Tachycardia - fast heartbeat
0%
Thrombosis - decrease blood flow to brain
0%
Heart Attack - death of heart muscle
Explanation
"Thrombosis" refers generally to the formation of a blood clot within a vessel anywhere in the body — it isn't specifically defined as reduced blood flow to the brain (that would describe a particular consequence, like a stroke, in one specific location). Bradycardia (slow heart rate), tachycardia (fast heart rate), and heart attack (death of heart muscle tissue) are all correctly defined.
Q.18
Intervertebral disc is found in the vertebral column of
0%
mammals
0%
amphibian
0%
reptiles
0%
birds
Explanation
(Note: intervertebral discs — fibrocartilaginous pads between vertebrae — are a standard, well-established characteristic feature of MAMMALS in vertebrate zoology, alongside features like a diaphragm and mammary glands; the marked answer here, birds, doesn't match this standard classification.)
Q.19
Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place
0%
none of these
0%
Internal intercostal muscles relax and diaphragm contracts
0%
external intercostal muscles and diaphragm relax External intercostal muscles and diaphragm contract
0%
Internal intercostal muscle contract and diaphragm relax
Explanation
During active/forced expiration, the internal intercostal muscles contract (pulling the ribs down and inward) while the diaphragm relaxes (moving back up into its dome shape) — both actions reduce chest cavity volume, pushing air out.
Q.20
Which of the following conditions causes filling of urinary bladder
0%
Contraction of detrusor muscle of urinary bladder and relaxation of internal sphincter
0%
Relaxation of detrusor muscle of urinary bladder and construction of internal sphincter
0%
Construction of detrusor muscle of urinary bladder and internal sphincter
0%
Relaxation of detrusor muscle of urinary bladder and internal sphincter
Explanation
The bladder fills when its detrusor (wall) muscle relaxes, allowing it to expand and hold more urine, while the internal sphincter contracts (stays closed) to prevent urine from leaking out prematurely.
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)