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 primary role of flavonoids in plants?
A.
Photosynthesis
B.
Pollination
C.
UV protection
D.
Water absorption
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Solution
Flavonoids protect plants from UV radiation and also have health benefits for humans.
Correct Answer:
C
— UV protection
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Q. What is the primary role of mycorrhizal fungi in plant ecology?
A.
Photosynthesis
B.
Nutrient absorption
C.
Seed dispersal
D.
Pollination
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Solution
Mycorrhizal fungi enhance nutrient absorption for plants.
Correct Answer:
B
— Nutrient absorption
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Q. What is the primary role of mycorrhizal fungi in plant evolution?
A.
Photosynthesis enhancement
B.
Nutrient absorption
C.
Seed dispersal
D.
Pollination
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Solution
Mycorrhizal fungi enhance nutrient absorption, which has been vital for plant evolution and adaptation to various soils.
Correct Answer:
B
— Nutrient absorption
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Q. What is the primary role of phloem in plants?
A.
Transport water
B.
Transport nutrients
C.
Transport sugars
D.
Provide structural support
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Solution
Phloem is primarily responsible for the transport of sugars and other metabolic products downward from the leaves.
Correct Answer:
C
— Transport sugars
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Q. What is the primary role of phloem in vascular plants?
A.
Transport of water
B.
Transport of nutrients
C.
Transport of photosynthates
D.
Storage of starch
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Solution
Phloem is responsible for the transport of photosynthates, primarily sugars produced during photosynthesis, from leaves to other parts of the plant.
Correct Answer:
C
— Transport of photosynthates
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Q. What is the primary role of stomata in plants?
A.
Photosynthesis
B.
Gas exchange
C.
Water storage
D.
Nutrient absorption
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Solution
Stomata are small openings on the leaf surface that facilitate gas exchange, allowing CO2 in and O2 out.
Correct Answer:
B
— Gas exchange
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Q. What is the primary role of the endodermis in plant roots?
A.
Water absorption
B.
Nutrient transport
C.
Regulating water and nutrient flow
D.
Storage of carbohydrates
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Solution
The endodermis regulates the flow of water and nutrients into the vascular system of the root, acting as a selective barrier.
Correct Answer:
C
— Regulating water and nutrient flow
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Q. What is the primary role of the xylem in plant evolution?
A.
Photosynthesis
B.
Water transport
C.
Nutrient storage
D.
Reproduction
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Solution
The xylem's primary role is water transport, which has been crucial for the evolution of terrestrial plants.
Correct Answer:
B
— Water transport
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Q. What is the primary role of xylem in vascular plants?
A.
Transport of nutrients
B.
Transport of water
C.
Photosynthesis
D.
Storage of carbohydrates
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Solution
Xylem is primarily responsible for the transport of water and minerals from the roots to the rest of the plant.
Correct Answer:
B
— Transport of water
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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 alleles in inheritance?
A.
They are the same as genes
B.
They are alternative forms of a gene
C.
They determine the environment of a plant
D.
They are only found in animals
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Solution
Alleles are different versions of a gene that can produce variations in traits among individuals.
Correct Answer:
B
— They are alternative forms of a gene
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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 auxins in plant development?
A.
Promote flowering
B.
Stimulate root growth
C.
Inhibit growth
D.
Promote fruit ripening
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Solution
Auxins stimulate root growth and are involved in various developmental processes.
Correct Answer:
B
— Stimulate root growth
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Q. What is the role of biopesticides in plant biotechnology?
A.
To enhance photosynthesis
B.
To control pest populations sustainably
C.
To improve soil fertility
D.
To increase plant height
Show solution
Solution
Biopesticides are used to control pest populations in a sustainable manner, reducing chemical pesticide use.
Correct Answer:
B
— To control pest populations sustainably
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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
Show solution
Solution
Cytokinins are hormones that stimulate cell division and promote shoot development.
Correct Answer:
B
— Stimulate cell division
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