Most important MCQs collection for MDCAT test from 2nd Year Biology Chapter No.1 Homeostasis. These Multiple Choice Questions are 98% ranking in all online Test schemes of 12th Class Biology Chapter No.1 Homeostasis.
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2nd Year Biology 57 most important Multiple Choice Questions taken from Homeostasis Chapter No.1
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2nd Year MCQs Biology
Chapter No. 1 Homeostasis
2nd Year Biology MCQs
Chapter No. 1 Homeostasis
Q.1 Animals cope with the temperature extremes by a homeostatic mechanism called:
A) Evaporative cooling
B) Shivering thermogenesis
C) Non-shivering thermogenesis
D) Thermoregulation
Answer:
D) Thermoregulation
Answer:
Answer is “Thermoregulation”
Explanation:
The process mentioned in
‘A’, ‘B’ and ‘C’ are partially supportive in temperature maintenance, however thermoregulation is the homeostatic process used in this regard.
Q.2 Each organism of a species has assumed, in evolutionary history a specific set up of _____ at various levels of organization suitable to its surrounding.
A) Internal environment
B) External environment
C) Intracellular environment
D) Intercellular environment
Answer:
A) Internal environment
Answer:
Answer is “Internal environment”
Explanation:
Homeostatic arrangements in each organism have acquired perfection through evolution and now each species have its own arrangement
Q.3 Weight of kidneys accounts for less than ________ % of the total body weight.
A) 10
B) 20
C) 1
D) 0.1
Answer:
D) 0.1
Answer:
Answer is “0.1”.
Explanation:
Kidneys contribute less than 1% of the total body weight but they receive 20% of the total blood of the body by each cardiac beat. This indicates their physiological importance.
Q.4 Kidneys receive _______ % of blood supplied with each cardiac beat.
A) 1
B) 10
C) 5
D) 20
Answer:
D) 20
Answer:
Answer is “20”.
Explanation:
Kidney contribute less than 1% of the total body weight but they receive 20% of the total blood of the body by each cardiac beat. This indicates their physiological importance.
Q.5 Nephrons,in human kidneys are arranged along two distinct regions, i.e.:
A) An inner cortex and outer medulla
B) An outer cortex and an inner medulla
C) An inner cortex and an inner medulla
D) An outer cortex and a middle medulla
Answer:
B) An outer cortex and an inner medulla
Answer:
Answer is “An outer cortex and an inner medulla”.
Explanation:
Cortex literally means outer layer and medulla literally means inner part. The outer and peripheral part is called renal cortex and inner or central part is called renal medulla.
Q.6 The structure which is specifically instrumental in the production of concentrated urine is:
A) Cortical nephron
B) Juxtamedullary nephron
C) Counter current multiplier
D) Restricted supply of water
Answer:
B) Juxtamedullary nephron
Answer:
Answer is “Juxtamedullary nephron”.
Explanation:
Though counter current multiplier and restricted supply of water are also associated with production of concentrated urine but they are not structures.
Q.7 The nephrons arranged along the cortex are called as:
A) Cortical
B) Juxtamedullary
C) Juxtacortical nephron
D) Medullary
Answer:
A) Cortical
Answer:
Answer is “Cortical”.
Explanation:
Cortex is the outer and peripheral part of kidneys whereas medulla is the inner or central part of kidney. The nephrons of cortisol part are called cortical nephrons.
Q.8 In each nephron inner end forms a cup shaped swelling, called:
A) Glomerulus
B) Bowman’s capsule
C) Renal pyramid
D) Renal hilus
Answer:
B) Bowman’s capsule
Answer:
Answer is “Bowman’s capsule”.
Explanation:
Bowman’s capsule or the Bowman capsule or capsule glomeruli or glomerular capsule is a cup like sac at the beginning of the tubular component of a nephron in the mammalian kidneys.
Q.9 In each nephron inner end forms a cup shaped swelling around a ball of capillaries called:
A) Bowman’s capsule
B) Glomerulus
C) Loop of Henle
D) Renal pelvis
Answer:
B) Glomerulus
Answer:
Answer is “Glomerulus”.
Explanation:
The ball of capillaries is called glomerulus which is surrounded by a cup shaped structure called Bowman’s capsule. Glomerulus circulates the blood in the cup shaped Bowman’s capsule.
Q.10 It circulates blood through a capsule in a nephron:
A) Afferent arteriole
B) Peritubular capillaries
C) Efferent arteriole
D) Glomerulus
Answer:
D) Glomerulus
Answer:
Answer is “Glomerulus”.
Explanation:
The ball of capillaries is called glomerulus which is surrounded by a cup shaped structure called Bowman’s capsule.
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