MCQ's on Homeostasis| class 12 with answers| Chapter–15 Biology MCQ's
In this article we will practice some MCQ's of Homeostasis.
"Homeostasis is a tendency of an organism or cell to regulate its internal conditions such as the chemical composition of its body fluids, so as to maintain health and functioning, regardless of outside conditions. The organism or cell maintains homeostasis by monitoring its internal condition and responding accurately when these conditions deviate from their normal state. Basically animals have two environment: an external environment and internal environment. An external environment in which the organism is situated and internal environment in which the tissue of the body live."
1. Which of the following is not a component of homeostasis?
A. Feedback loops
B. Hormonal regulation
C. Maintaining a constantly changing internal environment
D. Cellular communication
Correct option is D
(cellular communication).
2. What happens when body temperature rises above the set point?
A. Sweating increases to cool the body down
B. Shivering occurs to generate heat
C. Blood vessels constrict to retain heat
D. Metabolic rate decreases to conserve energy
Correct option is A
(Sweating increases to cool the body down).
3. Which organ regulates the body's water balance and blood pressure?
4. Which hormone is involved in the body's response to stress and triggers the fight-or-flight response?
A. Estrogen
B. Cortisol
C. Testosterone
D. Melatonin
Correct option is B
(cortisol).
5. What is the role of insulin in homeostasis?
A. Decreases blood sugar levels
B. Increases blood sugar levels
C. Regulates blood pressure
D. Controls body temperature
Correct option is B
(Increases blood sugar levels).
6. How does the body regulate oxygen and carbon dioxide levels during breathing?
A. By increasing heart rate
B. Through the contraction and relaxation of the diaphragm
C. By altering blood pH
D. Via the release of adrenaline
Correct option is B
(through the contraction and relaxation of the diaphragm)
7. What triggers the release of the hormone aldosterone?
A. High blood sugar levels
B. Low blood pressure
C. High blood pressure
D. Low blood calcium levels
Correct option is B
(Low blood pressure).
8. What is homeostasis?
A. The body's ability to maintain a stable internal environment
B. The process of removing waste from the body
C. The production of energy within cells
D. The body's response to external stimuli
Correct option is A
(the body's ability to maintain a stable internal environment).
9. Which organ is primarily responsible for regulating blood sugar levels in the body?
A. Liver
B. Pancreas
C. Kidneys
D. Stomach
Correct option is B
(pancreas).
10. What is the primary function of homeostasis?
A. To keep the body's temperature stable
B. To maintain a balance of fluids in the body
C. To regulate heart rate and blood pressure
D. All of the above
Correct option is D
(all of the above).
11. Which of the following is an example of negative feedback in maintaining homeostasis?
A. Shivering in response to cold temperatures
B. Sweating in response to high temperatures
C. Increased heart rate during exercise
D. None of the above
Correct option is A
(shivering in response to cold temperatures).
12. Which hormone is responsible for regulating calcium levels in the blood?
A. Insulin
B. Glucagon
C. Parathyroid hormone (PTH)
D. Thyroid hormone
Correct option is C
(parathyroid hormone).
13. Positive feedback mechanisms:
A. Maintain stability and equilibrium.
B. Amplify the original change.
C. Counteract deviations from the set point.
D. Reduce the response to the stimulus.
Correct option is D
(Reduce the response to the stimulus).
14. Negative feedback mechanisms:
A. Amplify the initial change in the system.
B. Counteract deviations from the set point.
C. Enhance the stability of the system.
D. Always result in extreme outcomes.
Correct option is B
Counteract deviations from the set point.
15. Which feedback mechanism helps in maintaining homeostasis?
A. Positive feedback
B. Negative feedback
C. Both positive and negative feedback
D. Neither positive nor negative feedback
Correct option is B
Negative feedback
16. In a positive feedback loop, the response:
A. Opposes the initial change.
B. Enhances the original stimulus.
C. Maintains stability.
D. Cancels out the effect of the stimulus.
Correct option is B
Enhances the original stimulus.
17. A thermostat regulating room temperature is an example of:
A. Positive feedback
B. Negative feedback
C. Both positive and negative feedback
D. Neither positive nor negative feedback
Correct option is B
Negative feedback.
18. During blood clotting, which feedback mechanism is primarily involved?
A. Positive feedback
B. Negative feedback
C. Both positive and negative feedback
D. Neither positive nor negative feedback
Correct option is A
Positive feedback.
19. Which statement best describes positive feedback?
A. It stabilizes a system.
B. It amplifies a change in the system.
C. It opposes the change in the system.
D. It maintains a steady state.
Correct option is B
It amplifies a change in the system.
20. An example of positive feedback in the human body is:
A. Regulation of body temperature
B. Childbirth
C. Regulation of blood sugar levels
D. Regulation of breathing rate
Correct option is B
Childbirth.
21. The role of negative feedback in a system is to:
A. Amplify changes in the system.
B. Counteract deviations from the set point.
C. Enhance stability.
D. Introduce new stimuli to the system.
Correct option is B
Counteract deviations from the set point.
22. Which feedback mechanism is more common in biological systems?
A. Positive feedback
B. Negative feedback
C. Both are equally common
D. Neither occurs in biological systems
Correct option is B
Negative feedback.
23. Osmoregulation primarily involves the regulation of:
A. Temperature
B. pH levels
C. Water balance
D. Blood sugar levels
Correct option is C
Water balance.
24. Which organ is primarily responsible for water balance in humans?
A. Liver
B. Kidneys
C. Heart
D. Lungs
Correct option is B
Kidney.
25. ADH (Antidiuretic Hormone) primarily acts on which organ to regulate water reabsorption?
A. Liver
B. Kidneys
C. Pancreas
D.Spleen
Correct option is B
Kidneys.
26. When blood osmolarity is high, the secretion of ADH:
A. Increases
B. Decreases
C. Stays constant
D. Stops completely
Correct option is A
Increases.
27. The hormone responsible for increasing water permeability in the collecting ducts of the kidney is:
A. Insulin
B. Cortisol
C. Aldosterone
D. Antidiuretic hormone (ADH)
Correct option is D
Antidiuretic hormone (ADH)
28. Which of the following environments would likely lead to increased ADH secretion?
A. High water intake
B. Low water intake
C. Balanced water intake
D. Consumption of high-protein diet
Correct option is B
Low water intake.
29. The reabsorption of water in the nephrons mainly occurs in the:
A. Proximal convoluted tubule
B. Distal convoluted tubule
C. Loop of Henle
D. Collecting duct
Correct option is D
Collecting duct
30. A decrease in blood pressure triggers the release of:
A. ADH
B. Aldosterone
C. Insulin
D. Glucagon
Correct option is B
Aldosterone.
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