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 the average lifespan of a red blood cell in humans?
A.
30 days
B.
60 days
C.
90 days
D.
120 days
Show solution
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
Show solution
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
Show solution
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
Show solution
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 flowers produced by a mature apple tree in a season?
A.
100 flowers
B.
500 flowers
C.
1000 flowers
D.
2000 flowers
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Solution
A mature apple tree can produce around 1000 flowers in a season, depending on the variety and conditions.
Correct Answer:
C
— 1000 flowers
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Q. What is the average number of fruits produced by a single tomato plant in a growing season?
A.
10
B.
50
C.
100
D.
200
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Solution
A single tomato plant can produce around 100 fruits in a growing season under optimal conditions.
Correct Answer:
C
— 100
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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 ovules per ovary in most flowering plants?
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Solution
Most flowering plants typically have 1 to several ovules per ovary, with an average often around 1 to 10.
Correct Answer:
C
— 10
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Q. What is the average number of ovules produced by a single ovary in a typical flowering plant?
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Solution
On average, a single ovary can produce around 5 to 10 ovules, but this can vary widely.
Correct Answer:
B
— 5
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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
Show solution
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 surface?
A.
10-100
B.
100-500
C.
500-1000
D.
1000-5000
Show solution
Solution
The average number of stomata per square millimeter on a leaf surface is typically between 100 and 500.
Correct Answer:
B
— 100-500
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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
Show solution
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
Show solution
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
Show solution
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
Show solution
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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Q. What is the basic unit of heredity in living organisms?
A.
Chromosome
B.
Gene
C.
DNA
D.
RNA
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Solution
A gene is the basic unit of heredity, responsible for the transmission of traits from parents to offspring.
Correct Answer:
B
— Gene
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Q. What is the basic unit of heredity in Mendelian genetics?
A.
Chromosome
B.
Gene
C.
DNA
D.
RNA
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Solution
A gene is the basic unit of heredity, responsible for the transmission of traits from parents to offspring.
Correct Answer:
B
— Gene
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Q. What is the D-value for a microorganism if it takes 5 minutes to reduce the population by 90% at 121°C?
A.
1 minute
B.
2 minutes
C.
5 minutes
D.
10 minutes
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Solution
The D-value is the time required to reduce the microbial population by 90%, which in this case is 5 minutes.
Correct Answer:
C
— 5 minutes
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Q. What is the effect of increased carbon dioxide concentration on photosynthesis?
A.
Decreases rate
B.
Increases rate
C.
No effect
D.
Stops photosynthesis
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Solution
Increased carbon dioxide concentration generally increases the rate of photosynthesis, up to a certain point.
Correct Answer:
B
— Increases rate
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Q. What is the effect of increased light intensity on the rate of photosynthesis, assuming other factors are constant?
A.
Decreases rate
B.
Increases rate
C.
No effect
D.
Stops photosynthesis
Show solution
Solution
Increased light intensity generally increases the rate of photosynthesis, up to a certain point.
Correct Answer:
B
— Increases rate
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Q. What is the effect of increased light intensity on the rate of photosynthesis, assuming other factors are optimal?
A.
Decreases rate
B.
Increases rate
C.
No effect
D.
Stops photosynthesis
Show solution
Solution
Increased light intensity generally increases the rate of photosynthesis, up to a certain point.
Correct Answer:
B
— Increases rate
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Q. What is the effect of increased light intensity on the rate of photosynthesis?
A.
Decreases rate
B.
Increases rate
C.
No effect
D.
Stops photosynthesis
Show solution
Solution
Increased light intensity generally increases the rate of photosynthesis up to a certain point.
Correct Answer:
B
— Increases rate
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Q. What is the effect of light intensity on the rate of photosynthesis?
A.
Increases then decreases
B.
Decreases
C.
Increases
D.
No effect
Show solution
Solution
The rate of photosynthesis generally increases with light intensity up to a certain point.
Correct Answer:
C
— Increases
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