Botany is the branch of Biology that focuses on the study of plants , their structure, functions, growth, reproduction, and role in the environment. This category is curated for school students (Classes 6–12) and undergraduate learners to build strong fundamentals with exam-focused clarity.
In this section, you’ll explore:
Plant morphology, anatomy, and physiology explained step-by-step
Reproduction in plants , development, and life cycles
Cell biology, genetics, and biotechnology concepts related to plants
Ecology and plant diversity with real-world relevance
Important questions, MCQs, diagrams, and revision notes for exams
The content is aligned with NCERT , school boards, and UG syllabi , making it highly useful for school exams, NEET preparation, and college assessments . Concepts are explained in simple language with a focus on understanding, not rote learning.
Build a strong foundation in plant sciences and master Botany with confidence.
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 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 height increase of a corn plant per week during its peak growth phase?
A.
1 cm
B.
5 cm
C.
10 cm
D.
15 cm
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Solution
During its peak growth phase, a corn plant can increase in height by about 10 cm per week.
Correct Answer:
C
— 10 cm
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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 lifespan of a biennial plant?
A.
1 year
B.
2 years
C.
3 years
D.
5 years
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Solution
Biennial plants typically have a lifespan of 2 years, completing their life cycle in that time.
Correct Answer:
B
— 2 years
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Q. What is the average lifespan of a parenchyma cell?
A.
Days
B.
Months
C.
Years
D.
Decades
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Solution
Parenchyma cells can live for several years, depending on the plant species.
Correct Answer:
C
— Years
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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 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
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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 surface?
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 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 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 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 optimal?
A.
Decreases rate
B.
Increases rate
C.
No effect
D.
Stops photosynthesis
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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 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?
A.
Decreases rate
B.
Increases rate
C.
No effect
D.
Stops photosynthesis
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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
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Solution
The rate of photosynthesis generally increases with light intensity up to a certain point.
Correct Answer:
C
— Increases
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Q. What is the end product of anaerobic respiration in plants?
A.
Lactic acid
B.
Ethanol
C.
Carbon dioxide
D.
Glucose
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Solution
The end product of anaerobic respiration in plants is ethanol, which is produced when oxygen is not available.
Correct Answer:
B
— Ethanol
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Q. What is the end product of the Calvin cycle?
A.
Oxygen
B.
Glucose
C.
NADPH
D.
ATP
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Solution
The end product of the Calvin cycle is glucose.
Correct Answer:
B
— Glucose
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Q. What is the expected phenotypic ratio in the offspring of a monohybrid cross between two heterozygous plants?
A.
1:1
B.
3:1
C.
9:3:3:1
D.
1:2:1
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Solution
In a monohybrid cross (Aa x Aa), the expected phenotypic ratio of the offspring is 3:1, where 3 exhibit the dominant trait and 1 exhibits the recessive trait.
Correct Answer:
B
— 3:1
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Q. What is the function of collenchyma cells in plants?
A.
Storage of starch
B.
Transport of nutrients
C.
Providing flexible support
D.
Photosynthesis
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Solution
Collenchyma cells provide flexible support to young stems and leaves, allowing for growth and movement.
Correct Answer:
C
— Providing flexible support
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Q. What is the function of collenchyma cells?
A.
Transport water
B.
Provide flexible support
C.
Store nutrients
D.
Conduct photosynthesis
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Solution
Collenchyma cells provide flexible support to young stems and leaves.
Correct Answer:
B
— Provide flexible support
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Q. What is the function of guard cells in plant leaves?
A.
Photosynthesis
B.
Water storage
C.
Regulating gas exchange
D.
Nutrient transport
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Solution
Guard cells regulate the opening and closing of stomata, controlling gas exchange and water loss.
Correct Answer:
C
— Regulating gas exchange
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Q. What is the function of ribosomes in plant cells?
A.
Energy production
B.
Photosynthesis
C.
Protein synthesis
D.
Cell division
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Solution
Ribosomes are responsible for protein synthesis, translating mRNA into polypeptide chains.
Correct Answer:
C
— Protein synthesis
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Q. What is the function of RuBisCO in the Calvin cycle?
A.
To produce ATP
B.
To fix carbon dioxide
C.
To generate NADPH
D.
To release oxygen
Show solution
Solution
RuBisCO catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer:
B
— To fix carbon dioxide
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