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NEET Biology MCQ
Quiz 3
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Q.1
Distal convoluted tubule is lined by
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epithelial cells
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cuboidal cells
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ciliated cells
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transitional epithelial cell
Explanation
The distal convoluted tubule is lined by cuboidal epithelial cells.
Q.2
Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved.
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when intrapulmonary pressure is less than the atmospheric pressure
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intrapulmonary pressure is equal to the atmospheric pressure
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intrapleural pressure becomes more than the intra alveolar pressure
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intrapulmonary pressure is greater than the atmospheric pressure
Explanation
Inspiration happens when the intrapulmonary (inside-the-lungs) pressure drops below atmospheric pressure — that pressure difference is what drives air to flow inward into the lungs.
Q.3
Pick out the correct match
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sternum-14
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Face - 5
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Pelvis - 3
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Ribs - 20
Explanation
Matching bone counts by region: the pelvis (hip bone) is conventionally described as made up of 3 fused bones — the ilium, ischium, and pubis. (The sternum is a single bone, the face has 14 bones, and the rib cage has 24 ribs — not the 14, 5, and 20 given in the other options.)
Q.4
Bohr's effect is related with
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reduced carbon level in lymph
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reduced carbon dioxide level in blood
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reduced oxygen level in haemoglobin
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oxidised Phosphorus level in blood
Explanation
Bohr's effect describes how a rise in CO₂/acidity in the tissues lowers haemoglobin's affinity for oxygen — effectively reducing the amount of oxygen carried on/held by haemoglobin at that point, promoting oxygen release into the tissues that need it.
Q.5
Antidiuretic hormone is released from the hypothalamus when osmolarity of blood
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increases above 160 mOsmol/L
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increase above 300 mOsmol/L
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decreases below 100 mOsmol/L
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decrease below 300 mOsmol/L
Explanation
ADH release from the hypothalamus is triggered when blood osmolarity rises above roughly 300 mOsmol/L (indicating the blood has become too concentrated, e.g. from dehydration), signalling the kidneys to reabsorb more water.
Q.6
Blood flow to the skin
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increases when external environmental temperature rises
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increases when internal body temperature decreases so that the skin does not freeze
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is regulated mainly by decreasing pH
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decreases when external environmental temperature rises
Explanation
When the external environment gets hotter, skin blood vessels dilate, increasing blood flow to the skin — this helps the body dissipate excess heat more effectively to the surroundings.
Q.7
Immediately following strenuous and vigorous exercise, which of the following is most likely to occur
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the skin will be cold and clammy
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Capillaries of the active muscles will be engorged with blood
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blood flow to the Kidneys quickly increases
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blood will be rapidly diverted to the digestive organs
Explanation
Right after intense exercise, blood is preferentially directed to the muscles that were working hard, so their capillaries become engorged with blood — meanwhile, blood flow to the digestive organs and kidneys is actually reduced during and immediately after vigorous exercise, not increased.
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