Homeostasis and Response Practice Questions
GCSE · GCSE Biology · 145 free MCQs with instant results and detailed explanations.
145
Total
45
Easy
71
Medium
29
Hard
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Sample Questions from Homeostasis and Response
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Q1
Easy
What is the primary function of homeostasis in living organisms?
A.
To maintain a stable internal environment
B.
To enhance growth rate
C.
To increase energy production
D.
To improve reproductive success
Show Answer & Explanation
Correct Answer: A
Homeostasis refers to the processes that maintain a stable internal environment despite changes in external conditions, ensuring optimal functioning of cells and organs.
Q2
Easy
Which organ is mainly responsible for regulating body temperature in humans?
A.
Heart
B.
Liver
C.
Skin
D.
Lungs
Show Answer & Explanation
Correct Answer: C
The skin plays a crucial role in thermoregulation by facilitating heat loss through sweat and adjusting blood flow, helping to maintain a stable body temperature.
Q3
Easy
What hormone is released by the pancreas to lower blood sugar levels?
A.
Glucagon
B.
Insulin
C.
Adrenaline
D.
Cortisol
Show Answer & Explanation
Correct Answer: B
Insulin is the hormone produced by the pancreas that helps to lower blood sugar levels by facilitating the uptake of glucose into cells for energy or storage.
Q4
Medium
Which part of the brain is primarily responsible for regulating body temperature?
A.
Cerebrum
B.
Hypothalamus
C.
Cerebellum
D.
Medulla Oblongata
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Correct Answer: B
The hypothalamus plays a crucial role in regulating body temperature by acting as the body's thermostat, receiving signals about temperature changes and initiating responses to maintain homeostasis.
Q5
Medium
How does the body respond to an increase in external temperature?
A.
Increased sweating
B.
Decreased blood flow to the skin
C.
Increased metabolic rate
D.
Shivering
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Correct Answer: A
An increase in external temperature causes the body to produce more sweat to promote evaporative cooling, thus helping to lower body temperature.
Q6
Medium
What is the primary hormone released in response to low blood glucose levels?
A.
Insulin
B.
Glucagon
C.
Adrenaline
D.
Cortisol
Show Answer & Explanation
Correct Answer: B
Glucagon is released by the pancreas to increase blood glucose levels by promoting glycogen breakdown in the liver when glucose levels are low.
Q7
Medium
Which of the following is NOT a method of maintaining homeostasis in the human body?
A.
Thermoregulation
B.
Cellular respiration
C.
Osmoregulation
D.
Respiratory regulation
Show Answer & Explanation
Correct Answer: B
Cellular respiration is a metabolic process that generates energy and is not directly involved in maintaining homeostasis, unlike thermoregulation, osmoregulation, and respiratory regulation which help maintain stable internal conditions.
Q8
Hard
Which of the following hormones is primarily responsible for regulating blood glucose levels during periods of fasting?
A.
Insulin
B.
Glucagon
C.
Cortisol
D.
Adrenaline
Show Answer & Explanation
Correct Answer: B
Glucagon is the hormone that raises blood glucose levels by promoting the conversion of glycogen to glucose in the liver, especially during fasting. Insulin, on the other hand, lowers blood glucose levels after meals.
Q9
Hard
A patient exhibits excessive urination and thirst. Blood tests reveal high levels of glucose. Which condition is most likely affecting this patient?
A.
Diabetes Mellitus
B.
Hypoglycemia
C.
Cushing's Syndrome
D.
Hyperthyroidism
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Correct Answer: A
The symptoms of excessive urination and thirst, coupled with high blood glucose levels, are characteristic of Diabetes Mellitus, where the body's ability to regulate glucose is impaired.
Q10
Hard
In humans, which hormone is primarily responsible for increasing the blood glucose levels during fasting?
A.
Insulin
B.
Glucagon
C.
Adrenaline
D.
Cortisol
Show Answer & Explanation
Correct Answer: B
Glucagon is the hormone that raises blood glucose levels by stimulating the liver to release stored glucose. Insulin, on the other hand, lowers blood glucose levels, making glucagon the correct choice in this context.
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Homeostasis and Response — GCSE GCSE Biology Practice Questions Online
This page contains 145 practice MCQs for the chapter Homeostasis and Response in GCSE GCSE Biology. The questions are organized by difficulty — 45 easy, 71 medium, 29 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.