Biology is the science of life — from the tiniest cell to the most complex human systems. This category is designed to support school students (Classes 6–12) as well as undergraduate (UG) learners with clear explanations, exam-focused content, and concept-building resources. You’ll find:
Concept-wise explanations aligned with NCERT and common UG syllabi
Important questions & answers for school exams, NEET foundation, and college tests
Human physiology, genetics, ecology, biotechnology, and cell biology explained simply
Practice questions, MCQs, and revision notes to strengthen understanding
Doubt-solving and conceptual clarity for competitive and academic success
Whether you’re preparing for school exams , building a strong base for NEET , or studying Biology at the undergraduate level , this section helps you learn smarter, revise faster, and understand Biology deeply — not just memorize it.
Learn life sciences the right way — clear concepts, exam relevance, and real understanding.
Q. What is produced during the light reactions of photosynthesis?
A.
Glucose
B.
Oxygen
C.
NADPH
D.
Both Oxygen and NADPH
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Solution
Both oxygen and NADPH are produced during the light reactions.
Correct Answer:
D
— Both Oxygen and NADPH
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Q. What is produced during the light-dependent reactions of photosynthesis?
A.
Glucose
B.
Oxygen
C.
NADPH
D.
Both B and C
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Solution
Oxygen and NADPH are produced during the light-dependent reactions.
Correct Answer:
D
— Both B and C
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Q. What is recombinant DNA technology primarily used for?
A.
To create genetically identical organisms
B.
To produce proteins, such as insulin
C.
To sequence entire genomes
D.
To analyze gene expression
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Solution
Recombinant DNA technology is used to combine DNA from different sources, often to produce proteins like insulin.
Correct Answer:
B
— To produce proteins, such as insulin
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Q. What is recombinant DNA?
A.
DNA that is naturally occurring
B.
DNA that has been artificially created by combining DNA from different sources
C.
DNA that is only found in viruses
D.
DNA that is only found in bacteria
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Solution
Recombinant DNA is formed by combining DNA from different organisms, allowing for the study and manipulation of genes.
Correct Answer:
B
— DNA that has been artificially created by combining DNA from different sources
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Q. What is the appropriate concentration of hydrogen peroxide for high-level disinfection?
A.
3%
B.
6%
C.
30%
D.
50%
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Solution
A concentration of 30% hydrogen peroxide is appropriate for high-level disinfection.
Correct Answer:
C
— 30%
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Q. What is the average blood pressure in a healthy adult?
A.
120/80 mmHg
B.
140/90 mmHg
C.
100/60 mmHg
D.
130/85 mmHg
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Solution
The average blood pressure in a healthy adult is typically around 120/80 mmHg.
Correct Answer:
A
— 120/80 mmHg
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Q. What is the average daily production of saliva in a human?
A.
0.5 liters
B.
1 liter
C.
1.5 liters
D.
2 liters
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Solution
The average daily production of saliva in a human is about 1 liter.
Correct Answer:
B
— 1 liter
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Q. What is the average duration of human gestation?
A.
28 weeks
B.
36 weeks
C.
40 weeks
D.
44 weeks
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Solution
The average duration of human gestation is approximately 40 weeks.
Correct Answer:
C
— 40 weeks
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Q. What is the average growth rate of a typical tree in cm per year?
A.
10 cm
B.
20 cm
C.
30 cm
D.
40 cm
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Solution
On average, many tree species grow about 20 cm per year under optimal conditions.
Correct Answer:
B
— 20 cm
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Q. What is the average heart rate of a healthy adult at rest?
A.
60-100 beats per minute
B.
40-60 beats per minute
C.
100-120 beats per minute
D.
120-140 beats per minute
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Solution
The average heart rate of a healthy adult at rest is typically between 60 and 100 beats per minute.
Correct Answer:
A
— 60-100 beats per minute
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Q. What is the average height of a fully grown bamboo plant?
A.
5 m
B.
10 m
C.
15 m
D.
20 m
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Solution
The average height of a fully grown bamboo plant can reach up to 15 m.
Correct Answer:
C
— 15 m
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Q. What is the average length of a human newborn at birth?
A.
40 cm
B.
50 cm
C.
60 cm
D.
70 cm
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Solution
The average length of a human newborn at birth is approximately 50 cm.
Correct Answer:
B
— 50 cm
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Q. What is the average length of the human small intestine?
A.
3 meters
B.
5 meters
C.
7 meters
D.
9 meters
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Solution
The average length of the human small intestine is approximately 5 meters.
Correct Answer:
B
— 5 meters
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Q. What is the average lifespan of a red blood cell in humans?
A.
30 days
B.
60 days
C.
90 days
D.
120 days
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Solution
The average lifespan of a red blood cell in humans is about 120 days.
Correct Answer:
D
— 120 days
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Q. What is the average lifespan of a red blood cell?
A.
120 days
B.
30 days
C.
60 days
D.
90 days
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Solution
The average lifespan of a red blood cell is about 120 days before it is recycled by the body.
Correct Answer:
A
— 120 days
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Q. What is the average lifespan of a typical herbaceous plant?
A.
1 year
B.
2 years
C.
5 years
D.
10 years
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Solution
The average lifespan of a typical herbaceous plant is about 1 year.
Correct Answer:
A
— 1 year
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Q. What is the average minute ventilation for a resting adult?
A.
5-10 L
B.
10-15 L
C.
15-20 L
D.
20-25 L
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Solution
The average minute ventilation for a resting adult is about 5-10 liters.
Correct Answer:
A
— 5-10 L
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Q. What is the average number of bowel movements per week for a healthy adult?
A.
3-4
B.
5-7
C.
8-10
D.
11-13
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Solution
A healthy adult typically has 5 to 7 bowel movements per week.
Correct Answer:
B
— 5-7
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Q. What is the average number of chloroplasts found in a typical mesophyll cell?
A.
1-10
B.
10-50
C.
50-100
D.
100-200
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Solution
A typical mesophyll cell contains about 10 to 50 chloroplasts.
Correct Answer:
B
— 10-50
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Q. What is the average number of ovules per ovary in a typical angiosperm?
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Solution
On average, a typical angiosperm ovary contains about 10 ovules.
Correct Answer:
C
— 10
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Q. What is the average number of seeds produced by a single sunflower head?
A.
100
B.
500
C.
1000
D.
2000
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Solution
A single sunflower head can produce around 1000 seeds on average.
Correct Answer:
C
— 1000
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Q. What is the average number of stomata per square millimeter on a leaf?
A.
10-100
B.
100-500
C.
500-1000
D.
1000-5000
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Solution
The average number of stomata per square millimeter on a leaf is typically between 100 and 500.
Correct Answer:
B
— 100-500
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Q. What is the average number of teeth in an adult human mouth?
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Solution
An adult human typically has 32 teeth, including wisdom teeth.
Correct Answer:
C
— 32
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Q. What is the average respiratory rate for a resting adult?
A.
8-12 breaths/min
B.
12-20 breaths/min
C.
20-30 breaths/min
D.
30-40 breaths/min
Show solution
Solution
The average respiratory rate for a resting adult is about 12-20 breaths per minute.
Correct Answer:
B
— 12-20 breaths/min
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Q. What is the average resting heart rate for adults?
A.
40-60 beats per minute
B.
60-100 beats per minute
C.
100-120 beats per minute
D.
120-140 beats per minute
Show solution
Solution
The average resting heart rate for adults is typically between 60-100 beats per minute.
Correct Answer:
B
— 60-100 beats per minute
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Q. What is the average size range of a typical plant cell?
A.
1-10 micrometers
B.
10-100 micrometers
C.
100-1000 micrometers
D.
1-10 millimeters
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Solution
Most plant cells range from 10 to 100 micrometers in size.
Correct Answer:
B
— 10-100 micrometers
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Q. What is the average tidal volume in a healthy adult human?
A.
250 mL
B.
500 mL
C.
750 mL
D.
1000 mL
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Solution
The average tidal volume in a healthy adult human is approximately 500 mL.
Correct Answer:
B
— 500 mL
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Q. What is the average time it takes for food to travel through the entire digestive system?
A.
24-36 hours
B.
36-48 hours
C.
48-72 hours
D.
72-96 hours
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Solution
It typically takes about 24 to 36 hours for food to travel through the entire digestive system.
Correct Answer:
A
— 24-36 hours
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Q. What is the basic structural unit of DNA?
A.
Nucleotide
B.
Amino acid
C.
Monosaccharide
D.
Fatty acid
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Solution
DNA is composed of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.
Correct Answer:
A
— Nucleotide
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Q. What is the basic unit of DNA structure?
A.
Amino acid
B.
Nucleotide
C.
Fatty acid
D.
Monosaccharide
Show solution
Solution
The basic unit of DNA structure is a nucleotide, which consists of a sugar, a phosphate group, and a nitrogenous base.
Correct Answer:
B
— Nucleotide
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