MCQ's on Homeostasis| class 12 with answers| Chapter–15 Biology MCQ's
Part -2
Welcome to an insightful journey through the fascinating realm of Homeostasis with our comprehensive Class 12 Biology MCQs, Chapter 15. Discover the intricate balance within living systems as we delve into this critical biological process. Our curated set of multiple-choice questions serves as an invaluable resource for students seeking a deeper understanding of Homeostasis. From exploring the mechanisms that maintain stability within organisms to unraveling the significance of this process in biological systems, these MCQs are designed to enhance your knowledge and prepare you effectively. Unlock the secrets of biological equilibrium and master this pivotal concept in biology with our enriching collection of Chapter 15 Biology MCQs on Homeostasis. In this article we will practice some more MCQ's on Homeostasis.
A. Receptor
B. Control centre
C. Effector
D. All of these✅
2. Osmoregulation primarily helps in maintaining:
A. Oxygen level
B. Electrolyte balance✅
C. Blood glucose levels
D. Muscle strength
3. In human body _______ are involved in the detection of temperature change.
A. Thermoreceptors✅
B. Chemoreceptors
C. Osmoregulators
D. Osmoconformers
B. Hind brain
C. Midbrain
D. All of these
5. A reversal of the direction of change which tends to stabilize a system, correcting deviations from the normal state is called:
A. Negative feedback✅
B. Positive feedback
C. Both of these
D. None of these
6. Normal body temperature is:
31. Which of the following plays a vital role in the regulation of sodium and potassium levels in the blood?
A. ADH
B. Aldosterone✅
C. Insulin
D. Melatonin
B. Limbic system
C. Thalamus
D. None of these
33. Marine animals typically face the challenge of:
A. Excessive water intake
B. Excessive salt intake✅
C. Excessive oxygen intake
D. Excessive glucose intake
34. Which organ in marine bony fish is responsible for removing excess salts?
A. Gills✅
B. Kidneys
C. Liver
D. Intestines
35. Osmoregulation in marine animals often involves:
A. Excreting large volumes of dilute urine
B. Retaining water by producing concentrated urine✅
C. Releasing excess glucose through urine
D. Absorbing excess salts through the skin
36. Marine reptiles, like sea turtles, expel excess salts through:
A. Kidneys
B. Gills
C. Salt glands near the eyes✅
D. Skin pores
37. The main challenge for osmoregulation in marine organisms is maintaining:
A. Low internal salt concentrations
B. High internal salt concentrations✅
C. High water intake
D. Low water intake
38. Freshwater animals often face the issue of:
A. Water loss✅
B. Salt loss
C. Excessive glucose levels
D. Oxygen toxicity
39. Freshwater fish excrete excess water by producing:
A. Dilute urine✅
B. Concentrated urine
C. Mucus
D. Urea
40. To compensate for salt loss, freshwater animals:
A. Actively absorb salts through gills
B. Filter excess salts through their skin
C. Consume more salt-rich food
D. Excrete excess salts through urine✅
41. Freshwater invertebrates use specialized structures called _____ to regulate osmolarity.
A. Gills
B. Malpighian tubules✅
C. Nephrons
D. Salt glands
42. Freshwater organisms need to constantly:
A. Excrete water
B. Retain water✅
C. Excrete salts
D. Retain salts
43. Terrestrial animals often combat water loss through:
A. Increased urine production
B. Decreased urine production✅
C. Increased respiration rate
D. Decreased respiratory surface area
44. Kangaroo rats, living in arid environments, rely on:
A. Excreting very concentrated urine✅
B. Drinking large amounts of water
C. Decreasing their metabolic rate
D. Retaining excess salts
45. Desert-dwelling animals conserve water by:
A. Excreting concentrated urine✅
B. Excreting dilute urine
C. Increasing perspiration
D. Decreasing salt intake
46. The skin of terrestrial animals serves as a barrier to prevent excessive:
A. Salt absorption
B. Water loss✅
C. Glucose intake
D. Oxygen intake
47. Terrestrial animals in arid environments tend to have adaptations that:
A. Minimize water intake✅
B. Maximize water intake
C. Maximize salt intake
D. Maximize glucose intake
48 Marine birds often drink seawater. To cope with the excess salt, they possess:
A. Highly efficient kidneys
B. Salt glands near the eyes✅
C. Extremely diluted urine
D. Specialized gills for salt excretion
50. Freshwater crustaceans, like crayfish, use specialized structures called _____ to regulate ion balance.
A. Gills
B. Nephrons
C. Antennae
D. Malpighian tubules✅
51. The primary osmoregulatory organ in freshwater fish is the:
A. Liver
B. Gills✅
C. Kidneys
D. Spleen
52. Insects living in arid environments often excrete waste through specialized structures called:
A. Lungs
B. Malpighian tubules
C. Nephrons✅
D. Tracheae
53. Reptiles and birds living in arid regions minimize water loss by:
A. Increasing respiratory rate
B. Excreting very dilute urine
C. Utilizing salt glands for water conservation✅
D. Decreasing skin impermeability
55. Animals living in constantly changing environments require osmoregulatory adaptations to:
A. Cope with varying oxygen levels
B. Maintain stable pH levels
C. Adjust to fluctuations in temperature
D. Handle changing salt concentrations✅
56. Osmoregulation in animals involves balancing the uptake and loss of:
A. Glucose
B. Water and ions✅
C. Oxygen and carbon dioxide
D. Fats and proteins
57. The primary purpose of osmoregulation is to:
A. Regulate body temperature
B. Maintain homeostasis of water and solutes✅
C. Control hormonal levels
D. Increase muscle mass
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