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 percentage of a plant's biomass is typically made up of water?
A.
30%
B.
50%
C.
70%
D.
90%
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Solution
Approximately 70% of a plant's biomass is made up of water.
Correct Answer:
C
— 70%
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Q. What role do accessory pigments play in photosynthesis?
A.
They directly produce glucose
B.
They capture additional light wavelengths
C.
They release oxygen
D.
They fix carbon dioxide
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Solution
Accessory pigments capture additional light wavelengths, broadening the spectrum of light used for photosynthesis.
Correct Answer:
B
— They capture additional light wavelengths
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Q. What role do biopesticides play in sustainable agriculture?
A.
They increase chemical pesticide use
B.
They promote soil erosion
C.
They reduce reliance on synthetic chemicals
D.
They decrease crop diversity
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Solution
Biopesticides are derived from natural materials and help reduce reliance on synthetic chemicals, promoting sustainable agricultural practices.
Correct Answer:
C
— They reduce reliance on synthetic chemicals
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Q. What role do C4 and CAM pathways play in photosynthesis?
A.
They enhance light absorption
B.
They reduce water loss
C.
They increase oxygen production
D.
They are types of light reactions
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Solution
C4 and CAM pathways are adaptations that help plants reduce water loss during photosynthesis.
Correct Answer:
B
— They reduce water loss
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Q. What role do C4 and CAM plants play in photosynthesis under arid conditions?
A.
They increase water loss
B.
They enhance carbon fixation efficiency
C.
They reduce light absorption
D.
They eliminate the need for light
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Solution
C4 and CAM plants enhance carbon fixation efficiency to minimize water loss in arid conditions.
Correct Answer:
B
— They enhance carbon fixation efficiency
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Q. What role do environmental changes play in plant evolution?
A.
They have no role
B.
They can trigger mass extinction
C.
They can lead to adaptive radiation
D.
They only affect animal species
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Solution
Environmental changes can lead to adaptive radiation, where species evolve rapidly to fill new ecological niches.
Correct Answer:
C
— They can lead to adaptive radiation
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Q. What role do fruits play in the reproduction of flowering plants?
A.
They provide nutrients to the roots
B.
They protect the seeds and aid in their dispersal
C.
They enhance photosynthesis
D.
They attract herbivores for growth
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Solution
Fruits protect developing seeds and often aid in their dispersal by attracting animals that eat the fruit and excrete the seeds elsewhere.
Correct Answer:
B
— They protect the seeds and aid in their dispersal
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Q. What role do mutations play in plant evolution?
A.
They are harmful and should be eliminated
B.
They provide raw material for genetic variation
C.
They have no effect on evolution
D.
They only occur in animals
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Solution
Mutations provide the raw material for genetic variation, which is essential for the process of evolution.
Correct Answer:
B
— They provide raw material for genetic variation
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Q. What role do mycorrhizal fungi play in plant health?
A.
They decompose organic matter
B.
They fix atmospheric nitrogen
C.
They enhance nutrient absorption
D.
They produce plant hormones
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Solution
Mycorrhizal fungi form symbiotic relationships with plant roots, enhancing nutrient absorption, particularly phosphorus.
Correct Answer:
C
— They enhance nutrient absorption
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Q. What role do plant classifications play in conservation efforts?
A.
They hinder conservation efforts
B.
They help identify endangered species
C.
They promote invasive species
D.
They are irrelevant to conservation
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Solution
Plant classifications help identify endangered species, which is crucial for conservation efforts.
Correct Answer:
B
— They help identify endangered species
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Q. What role do pollinators play in the evolution of flowering plants?
A.
They increase genetic diversity
B.
They decrease competition
C.
They promote asexual reproduction
D.
They limit species distribution
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Solution
Pollinators play a crucial role in the evolution of flowering plants by increasing genetic diversity through cross-pollination.
Correct Answer:
A
— They increase genetic diversity
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Q. What role do terpenes play in plant health and human medicine?
A.
Photosynthesis
B.
Aromatic properties
C.
Nutrient absorption
D.
Water retention
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Solution
Terpenes contribute to the aroma of plants and have various therapeutic effects.
Correct Answer:
B
— Aromatic properties
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Q. What role do terpenes play in plant health?
A.
Photosynthesis
B.
Attracting pollinators
C.
Water absorption
D.
Nutrient storage
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Solution
Terpenes attract pollinators and can deter herbivores, aiding in plant reproduction.
Correct Answer:
B
— Attracting pollinators
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Q. What role does NADPH play in photosynthesis?
A.
It stores energy
B.
It acts as an electron donor
C.
It is a byproduct
D.
It helps in water splitting
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Solution
NADPH acts as an electron donor in the Calvin cycle, providing the reducing power for carbon fixation.
Correct Answer:
B
— It acts as an electron donor
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Q. What role does RuBisCO play in photosynthesis?
A.
It absorbs light
B.
It fixes carbon dioxide
C.
It produces ATP
D.
It generates oxygen
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Solution
RuBisCO is the enzyme that catalyzes the fixation of carbon dioxide in the Calvin cycle.
Correct Answer:
B
— It fixes carbon dioxide
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Q. What role does water play in the light reactions of photosynthesis?
A.
Source of carbon
B.
Source of electrons
C.
Source of ATP
D.
Source of glucose
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Solution
Water acts as a source of electrons in the light reactions, which are used to replace those lost by chlorophyll.
Correct Answer:
B
— Source of electrons
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Q. What role does water play in the light reactions?
A.
It absorbs light
B.
It provides electrons
C.
It fixes carbon
D.
It produces glucose
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Solution
Water provides electrons through the process of photolysis during the light reactions.
Correct Answer:
B
— It provides electrons
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Q. What term describes the evolutionary process where two or more species influence each other's evolution?
A.
Co-evolution
B.
Convergent evolution
C.
Divergent evolution
D.
Adaptive radiation
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Solution
Co-evolution refers to the process where two or more species reciprocally affect each other's evolution.
Correct Answer:
A
— Co-evolution
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Q. What term describes the evolutionary process where unrelated species evolve similar traits due to similar environmental pressures?
A.
Convergent evolution
B.
Divergent evolution
C.
Adaptive radiation
D.
Co-evolution
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Solution
Convergent evolution occurs when unrelated species develop similar traits as a result of adapting to similar environments.
Correct Answer:
A
— Convergent evolution
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Q. What term describes the evolutionary process where unrelated species evolve similar traits?
A.
Convergent evolution
B.
Divergent evolution
C.
Adaptive radiation
D.
Co-evolution
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Solution
Convergent evolution occurs when unrelated species develop similar traits due to similar environmental pressures.
Correct Answer:
A
— Convergent evolution
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Q. What term describes the evolutionary relationship between different plant species?
A.
Phylogeny
B.
Morphology
C.
Taxonomy
D.
Ecology
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Solution
Phylogeny refers to the evolutionary history and relationships among species.
Correct Answer:
A
— Phylogeny
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Q. What term describes the genetic makeup of an organism?
A.
Phenotype
B.
Genotype
C.
Allele
D.
Chromosome
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Solution
The genotype refers to the specific genetic constitution of an organism, while the phenotype is the observable expression of that genotype.
Correct Answer:
B
— Genotype
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Q. What term describes the process by which two species evolve in response to each other?
A.
Convergent evolution
B.
Divergent evolution
C.
Co-evolution
D.
Adaptive radiation
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Solution
Co-evolution refers to the process where two or more species influence each other's evolutionary trajectory.
Correct Answer:
C
— Co-evolution
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Q. What type of cell division is responsible for the growth of meristematic tissues?
A.
Mitosis
B.
Meiosis
C.
Binary fission
D.
Fragmentation
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Solution
Meristematic tissues grow through mitosis, allowing for the production of new cells for growth.
Correct Answer:
A
— Mitosis
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Q. What type of cell is responsible for photosynthesis in leaves?
A.
Sclerenchyma
B.
Collenchyma
C.
Chlorenchyma
D.
Meristematic
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Solution
Chlorenchyma cells, which contain chloroplasts, are specialized for photosynthesis.
Correct Answer:
C
— Chlorenchyma
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Q. What type of cells are responsible for the flexibility of young stems?
A.
Parenchyma
B.
Collenchyma
C.
Sclerenchyma
D.
Xylem
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Solution
Collenchyma cells provide flexibility and support to young stems and petioles.
Correct Answer:
B
— Collenchyma
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Q. What type of cells are responsible for the protective outer layer of plant organs?
A.
Parenchyma
B.
Collenchyma
C.
Epidermal cells
D.
Sclerenchyma
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Solution
Epidermal cells form the protective outer layer of plant organs, helping to prevent water loss and protect against pathogens.
Correct Answer:
C
— Epidermal cells
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Q. What type of cells are responsible for the secondary growth in plants?
A.
Apical meristem
B.
Lateral meristem
C.
Parenchyma
D.
Epidermal cells
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Solution
Lateral meristem, including vascular cambium and cork cambium, is responsible for secondary growth, increasing the girth of stems and roots.
Correct Answer:
B
— Lateral meristem
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Q. What type of cells are responsible for the transport of nutrients in plants?
A.
Xylem
B.
Phloem
C.
Parenchyma
D.
Collenchyma
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Solution
Phloem cells are responsible for the transport of nutrients, particularly sugars, throughout the plant.
Correct Answer:
B
— Phloem
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Q. What type of cells are responsible for the transport of water in plants?
A.
Phloem cells
B.
Sclerenchyma cells
C.
Xylem cells
D.
Parenchyma cells
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Solution
Xylem cells are specialized for the transport of water and dissolved minerals from the roots to the rest of the plant.
Correct Answer:
C
— Xylem cells
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