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 the purpose of bioremediation?
A.
To produce biofuels
B.
To clean up environmental contaminants
C.
To enhance soil fertility
D.
To create new pharmaceuticals
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Solution
Bioremediation is the use of microorganisms to clean up contaminated environments, such as oil spills.
Correct Answer:
B
— To clean up environmental contaminants
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Q. What is the purpose of marker-assisted selection in plant breeding?
A.
To identify plants with desirable traits
B.
To increase genetic diversity
C.
To enhance photosynthetic efficiency
D.
To reduce water requirements
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Solution
Marker-assisted selection helps breeders identify plants that carry desirable traits based on genetic markers.
Correct Answer:
A
— To identify plants with desirable traits
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Q. What is the purpose of using biopesticides in plant biotechnology?
A.
To enhance plant growth
B.
To control pest populations
C.
To improve seed germination
D.
To increase photosynthetic efficiency
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Solution
Biopesticides are used to control pest populations in an environmentally friendly manner, reducing reliance on chemical pesticides.
Correct Answer:
B
— To control pest populations
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Q. What is the purpose of using marker-assisted selection in plant breeding?
A.
To identify and select plants with desirable traits
B.
To enhance photosynthetic efficiency
C.
To increase seed size
D.
To improve soil fertility
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Solution
Marker-assisted selection is used to identify and select plants with desirable traits more efficiently in breeding programs.
Correct Answer:
A
— To identify and select plants with desirable traits
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Q. What is the relationship between photosynthesis and respiration in plants?
A.
They are the same process
B.
Photosynthesis produces oxygen for respiration
C.
Respiration produces glucose for photosynthesis
D.
They occur in different organisms
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Solution
Photosynthesis produces oxygen, which is then used in respiration, highlighting their interdependent relationship.
Correct Answer:
B
— Photosynthesis produces oxygen for respiration
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Q. What is the role of abscisic acid in plants?
A.
Promotes seed germination
B.
Inhibits growth during stress
C.
Stimulates flowering
D.
Enhances fruit ripening
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Solution
Abscisic acid primarily functions to inhibit growth and promote stress responses in plants.
Correct Answer:
B
— Inhibits growth during stress
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Q. What is the role of actinobacteria in soil health?
A.
They cause plant diseases
B.
They decompose organic matter
C.
They fix carbon dioxide
D.
They produce antibiotics
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Solution
Actinobacteria play a crucial role in decomposing organic matter, contributing to nutrient cycling in soil.
Correct Answer:
B
— They decompose organic matter
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Q. What is the role of Agrobacterium tumefaciens in plant biotechnology?
A.
It enhances photosynthesis
B.
It acts as a vector for gene transfer
C.
It improves root growth
D.
It increases resistance to pests
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Solution
Agrobacterium tumefaciens is used as a vector for gene transfer in plant biotechnology, facilitating the introduction of new genes into plant cells.
Correct Answer:
B
— It acts as a vector for gene transfer
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Q. What is the role of alkaloids in plants?
A.
Photosynthesis
B.
Defense against herbivores
C.
Water storage
D.
Nutrient absorption
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Solution
Alkaloids serve as a defense mechanism against herbivores due to their toxicity.
Correct Answer:
B
— Defense against herbivores
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Q. What is the role of ATP and NADPH in the Calvin cycle?
A.
Energy and reducing power
B.
Oxygen production
C.
Carbon fixation
D.
Light absorption
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Solution
ATP provides energy and NADPH provides reducing power for the Calvin cycle.
Correct Answer:
A
— Energy and reducing power
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Q. What is the role of ATP and NADPH produced in the light reactions?
A.
To provide energy and reducing power for the Calvin cycle
B.
To produce glucose directly
C.
To transport water
D.
To release oxygen
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Solution
ATP and NADPH provide the energy and reducing power needed for the Calvin cycle.
Correct Answer:
A
— To provide energy and reducing power for the Calvin cycle
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Q. What is the role of ATP in the light-independent reactions?
A.
Energy source
B.
Electron carrier
C.
Carbon source
D.
None of the above
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Solution
ATP serves as the energy source for the light-independent reactions (Calvin cycle).
Correct Answer:
A
— Energy source
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Q. What is the role of ATP synthase in photosynthesis?
A.
To absorb light
B.
To fix carbon
C.
To synthesize ATP
D.
To transport electrons
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Solution
ATP synthase synthesizes ATP from ADP and inorganic phosphate during the light reactions.
Correct Answer:
C
— To synthesize ATP
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Q. What is the role of auxins in apical dominance?
A.
Promote lateral bud growth
B.
Inhibit lateral bud growth
C.
Stimulate root growth
D.
Enhance leaf growth
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Solution
Auxins inhibit the growth of lateral buds, maintaining apical dominance in plants.
Correct Answer:
B
— Inhibit lateral bud growth
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Q. What is the role of chlorophyll in photosynthesis?
A.
To absorb water
B.
To capture light energy
C.
To synthesize glucose
D.
To release oxygen
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Solution
Chlorophyll captures light energy, which is essential for the light reactions of photosynthesis.
Correct Answer:
B
— To capture light energy
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Q. What is the role of chlorophyll in plants?
A.
Water absorption
B.
Nutrient transport
C.
Light absorption for photosynthesis
D.
Root growth
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Solution
Chlorophyll is the pigment that absorbs light energy for photosynthesis.
Correct Answer:
C
— Light absorption for photosynthesis
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Q. What is the role of collenchyma cells in plants?
A.
Storage of starch
B.
Support in young stems and leaves
C.
Water transport
D.
Photosynthesis
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Solution
Collenchyma cells provide flexible support to young stems and leaves, allowing for growth and movement.
Correct Answer:
B
— Support in young stems and leaves
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Q. What is the role of cytokinins in plant development?
A.
Promote leaf senescence
B.
Stimulate cell division
C.
Inhibit root growth
D.
Enhance photosynthesis
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Solution
Cytokinins are hormones that stimulate cell division and promote shoot development.
Correct Answer:
B
— Stimulate cell division
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Q. What is the role of cytokinins in plant growth?
A.
Promote root growth
B.
Stimulate cell division
C.
Inhibit leaf senescence
D.
All of the above
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Solution
Cytokinins stimulate cell division, promote root growth, and inhibit leaf senescence.
Correct Answer:
D
— All of the above
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Q. What is the role of essential oils derived from plants in human health?
A.
Photosynthesis
B.
Antimicrobial properties
C.
Water absorption
D.
Nutrient storage
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Solution
Essential oils from plants often possess antimicrobial properties, making them useful in health and wellness.
Correct Answer:
B
— Antimicrobial properties
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Q. What is the role of essential oils in plants that can also benefit human health?
A.
Photosynthesis
B.
Defense against pests
C.
Water absorption
D.
Nutrient storage
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Solution
Essential oils help plants defend against pests and can have therapeutic effects in humans.
Correct Answer:
B
— Defense against pests
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Q. What is the role of essential oils in plants that can also have therapeutic effects on humans?
A.
Photosynthesis
B.
Defense mechanisms
C.
Water storage
D.
Nutrient absorption
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Solution
Essential oils help protect plants from pests and diseases, and can have therapeutic effects when used in aromatherapy.
Correct Answer:
B
— Defense mechanisms
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Q. What is the role of essential oils in plants?
A.
Photosynthesis
B.
Defense against herbivores
C.
Water storage
D.
Nutrient absorption
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Solution
Essential oils serve as a defense mechanism against herbivores and pathogens.
Correct Answer:
B
— Defense against herbivores
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Q. What is the role of histones in plant cells?
A.
Energy production
B.
DNA packaging
C.
Photosynthesis
D.
Cell division
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Solution
Histones are proteins that help package DNA into a compact, organized structure called chromatin.
Correct Answer:
B
— DNA packaging
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Q. What is the role of monoclonal antibodies in biotechnology?
A.
To enhance photosynthesis
B.
To target specific cells in therapy
C.
To produce insulin
D.
To modify genetic sequences
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Solution
Monoclonal antibodies are designed to target specific cells, making them useful in therapies and diagnostics.
Correct Answer:
B
— To target specific cells in therapy
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Q. What is the role of mutations in plant evolution?
A.
They are harmful and should be avoided
B.
They provide raw material for evolution
C.
They have no role in evolution
D.
They only occur in animals
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Solution
Mutations provide the raw material for evolution by introducing new genetic variations into a population.
Correct Answer:
B
— They provide raw material for evolution
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Q. What is the role of mycorrhizae in plant ecology?
A.
Water storage
B.
Nutrient absorption
C.
Photosynthesis
D.
Seed dispersal
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Solution
Mycorrhizae enhance nutrient absorption for plants, particularly phosphorus.
Correct Answer:
B
— Nutrient absorption
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Q. What is the role of mycorrhizae in plant growth?
A.
Water storage
B.
Nutrient absorption
C.
Photosynthesis
D.
Gas exchange
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Solution
Mycorrhizae enhance nutrient absorption, particularly phosphorus, from the soil.
Correct Answer:
B
— Nutrient absorption
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Q. What is the role of mycorrhizal fungi in plant growth?
A.
Photosynthesis
B.
Nutrient absorption
C.
Water storage
D.
Pollination
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Solution
Mycorrhizal fungi enhance nutrient absorption, particularly phosphorus, for plants.
Correct Answer:
B
— Nutrient absorption
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Q. What is the role of NADPH in photosynthesis?
A.
Energy storage
B.
Electron transport
C.
Carbon fixation
D.
Light absorption
Show solution
Solution
NADPH serves as an electron carrier in the light-independent reactions of photosynthesis.
Correct Answer:
B
— Electron transport
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