Biology MCQ for Pharmacy Entrance Exam

Here are Class 12 Biology Multiple Choice Questions and Answers with detailed explanations for Pharmacy Entrance Exam.

1. Along with oxygen what are the other components decomposition depend on?
a) Oxygen
b) Chemical composition of detritus
c) Decomposers
d) Leaching
View Answer

Answer: b
Explanation: The physical and chemical process of break down complex organic remains (dead or decaying organisms) into inorganic substances is called decomposition. Along with the availability of oxygen, the decomposition also depends on the chemical composition of detritus.

2. Along with oxygen what are the other components decomposition depend on?
a) Climatic conditions
b) Decomposers
c) Humification
d) Leaching
View Answer

Answer: a
Explanation: The physical and chemical process of break down complex organic remains (dead or decaying organisms) into inorganic substances is called decomposition. Along with the availability of oxygen, the decomposition also depends on the climatic conditions.

3. At what rate does decomposition occur when detritus is rich in nitrogen and sugars?
a) Slower
b) Faster
c) Moderate
d) Neutral
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Answer: b
Explanation: When detritus is rich in nitrogen and sugars, the decomposition occurs at a faster rate. The physical and chemical process of break down complex organic remains (dead or decaying organisms) into inorganic substances is called decomposition.

4. At what rate does decomposition occur when detritus is rich in lignin and chitin?
a) Faster
b) Neutral
c) Moderate
d) Slower
View Answer

Answer: d
Explanation: When detritus is rich in lignin and chitin the decomposition occurs at a slower rate. The physical and chemical process of break down complex organic remains (dead or decaying organisms) into inorganic substances is called decomposition.

5. What environment is favorable for the process of decomposition?
a) Low temperature and anaerobic conditions
b) High temperature
c) Warm and moist
d) Watery
View Answer

Answer: c
Explanation: The physical and chemical process of break down complex organic remains (dead or decaying organisms) into inorganic substances is called decomposition. It is favored by a warm and moist environment.

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6. What environment is unfavorable for the process of decomposition?
a) Warm
b) Low temperature and anaerobic conditions
c) Moist
d) Having good humus
View Answer

Answer: b
Explanation: The physical and chemical process of break down complex organic remains (dead or decaying organisms) into inorganic substances is called decomposition. Low temperature and anaerobic conditions are unfavorable for the process of decomposition.

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