Characteristics of Living Organisms Practice Questions
IGCSE (Cambridge) · IGCSE Biology · 147 free MCQs with instant results and detailed explanations.
147
Total
44
Easy
74
Medium
29
Hard
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Sample Questions from Characteristics of Living Organisms
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Q1
Easy
Which of the following is NOT considered a characteristic of living organisms?
A.
Growth
B.
Reproduction
C.
Respiration
D.
Color
Show Answer & Explanation
Correct Answer: D
Color is a physical characteristic and does not define life processes. Growth, reproduction, and respiration are essential characteristics of living organisms.
Q2
Easy
What process do living organisms primarily use to convert food into energy?
A.
Photosynthesis
B.
Respiration
C.
Fermentation
D.
Excretion
Show Answer & Explanation
Correct Answer: B
Respiration is the process through which living organisms convert food into energy, while photosynthesis is specific to plants, fermentation is a different process, and excretion is the removal of waste.
Q3
Easy
Which characteristic of living organisms is demonstrated by a plant bending towards light?
A.
Movement
B.
Growth
C.
Response to stimuli
D.
Reproduction
Show Answer & Explanation
Correct Answer: C
The bending of a plant towards light is a response to stimuli, specifically phototropism, which is a characteristic of living organisms indicating their ability to respond to environmental changes.
Q4
Medium
Which of the following is NOT a characteristic of living organisms?
A.
Growth
B.
Movement
C.
Respiration
D.
Inertia
Show Answer & Explanation
Correct Answer: D
Inertia refers to the tendency of an object to remain at rest or in uniform motion, which is not a characteristic of living organisms. Living organisms exhibit growth, movement, and respiration.
Q5
Medium
Which of the following processes do living organisms use to convert glucose into energy?
A.
Photosynthesis
B.
Cellular respiration
C.
Transpiration
D.
Fermentation
Show Answer & Explanation
Correct Answer: B
Cellular respiration is the process by which living organisms convert glucose into energy, while photosynthesis is specifically for plants. Transpiration refers to water movement, and fermentation is a form of respiration but not the primary method for energy conversion.
Q6
Medium
Which of the following is essential for maintaining homeostasis in living organisms?
A.
Reproduction
B.
Excretion
C.
Growth
D.
Response to stimuli
Show Answer & Explanation
Correct Answer: B
Excretion is essential for removing waste products from the body, which helps maintain a stable internal environment, or homeostasis. Reproduction, growth, and response to stimuli are important but do not directly regulate internal conditions.
Q7
Medium
In a given habitat, two species of birds compete for the same food source. This competition is an example of which ecological interaction?
A.
Mutualism
B.
Competition
C.
Commensalism
D.
Predation
Show Answer & Explanation
Correct Answer: B
Competition occurs when two species vie for the same resources, such as food. Mutualism involves both species benefiting, commensalism involves one benefiting without affecting the other, and predation involves one organism feeding on another.
Q8
Hard
Which of the following characteristics of living organisms is primarily responsible for the survival of species through genetic variation?
A.
Reproduction
B.
Respiration
C.
Homeostasis
D.
Growth
Show Answer & Explanation
Correct Answer: A
Reproduction is the process that enables organisms to pass on their genetic information to the next generation, thereby ensuring genetic variation and the continuation of the species.
Q9
Hard
An experiment was conducted to measure the effect of temperature on the rate of enzyme activity. If an enzyme's activity is optimal at 37°C and the activity significantly decreases at 50°C, which of the following concepts does this illustrate?
A.
Enzymatic inhibition
B.
Denaturation
C.
Catalytic efficiency
D.
Feedback regulation
Show Answer & Explanation
Correct Answer: B
Denaturation occurs when an enzyme's structure is altered due to high temperatures, leading to a loss of its functional shape and, consequently, a decrease in activity.
Q10
Hard
Which of the following characteristics is primarily responsible for the adaptation of organisms to their environment?
A.
Reproduction
B.
Metabolism
C.
Response to stimuli
D.
Growth and development
Show Answer & Explanation
Correct Answer: C
Response to stimuli allows organisms to adapt to their environment. It helps them survive by reacting to changes and challenges in their surroundings.
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Characteristics of Living Organisms — IGCSE (Cambridge) IGCSE Biology Practice Questions Online
This page contains 147 practice MCQs for the chapter Characteristics of Living Organisms in IGCSE (Cambridge) IGCSE Biology. The questions are organized by difficulty — 44 easy, 74 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.