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. Which of the following is a benefit of using microbes in composting?
A.
They increase greenhouse gas emissions
B.
They speed up the decomposition process
C.
They reduce soil fertility
D.
They promote weed growth
Show solution
Solution
Microbes in composting break down organic matter quickly, speeding up the decomposition process and producing nutrient-rich compost.
Correct Answer:
B
— They speed up the decomposition process
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Q. Which of the following is a benefit of using microbial inoculants in agriculture?
A.
Increased soil erosion
B.
Enhanced plant growth
C.
Reduced biodiversity
D.
Increased water usage
Show solution
Solution
Microbial inoculants can enhance plant growth by improving nutrient availability and soil health.
Correct Answer:
B
— Enhanced plant growth
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Q. Which of the following is a benefit of using probiotics in agriculture?
A.
They increase crop yield
B.
They reduce soil pH
C.
They promote pest resistance
D.
They enhance nutrient uptake
Show solution
Solution
Probiotics can enhance crop yield by improving soil health and plant growth.
Correct Answer:
A
— They increase crop yield
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Q. Which of the following is a benefit of using tissue culture in plant biotechnology?
A.
Increased genetic diversity
B.
Rapid propagation of disease-free plants
C.
Improved soil quality
D.
Enhanced photosynthesis
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Solution
Tissue culture allows for the rapid propagation of disease-free plants, ensuring healthy stock.
Correct Answer:
B
— Rapid propagation of disease-free plants
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Q. Which of the following is a benefit of using tissue culture in plant propagation?
A.
Increased genetic diversity
B.
Faster growth rates
C.
Production of disease-free plants
D.
Lower production costs
Show solution
Solution
Tissue culture allows for the production of disease-free plants, which is a significant benefit in plant propagation.
Correct Answer:
C
— Production of disease-free plants
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Q. Which of the following is a benefit of using transgenic plants?
A.
Increased susceptibility to pests
B.
Higher yield under stress conditions
C.
Reduced photosynthesis
D.
Lower resistance to diseases
Show solution
Solution
Transgenic plants can be engineered to have higher yields, especially under stress conditions such as drought or salinity.
Correct Answer:
B
— Higher yield under stress conditions
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Q. Which of the following is a benefit of vegetative propagation?
A.
Increased genetic variation
B.
Faster reproduction
C.
Dependence on pollinators
D.
Higher seed production
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Solution
Vegetative propagation allows for faster reproduction as it does not rely on the slower process of seed formation.
Correct Answer:
B
— Faster reproduction
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Q. Which of the following is a byproduct of aerobic respiration in plants?
A.
Oxygen
B.
Glucose
C.
Carbon dioxide
D.
Water
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Solution
Carbon dioxide is a byproduct of aerobic respiration, released when glucose is oxidized.
Correct Answer:
C
— Carbon dioxide
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Q. Which of the following is a byproduct of respiration in plants?
A.
Oxygen
B.
Glucose
C.
Carbon dioxide
D.
Starch
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Solution
Carbon dioxide is a byproduct of respiration, released when glucose is broken down for energy.
Correct Answer:
C
— Carbon dioxide
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Q. Which of the following is a characteristic feature of amphibians?
A.
Feathers
B.
Scales
C.
Moist skin
D.
Fur
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Solution
Amphibians are characterized by their moist skin, which is essential for respiration and hydration.
Correct Answer:
C
— Moist skin
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Q. Which of the following is a characteristic feature of angiosperms?
A.
Naked seeds
B.
Flowers and fruits
C.
Vascular tissue
D.
Spores
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Solution
Angiosperms are characterized by the presence of flowers and fruits, which aid in reproduction.
Correct Answer:
B
— Flowers and fruits
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Q. Which of the following is a characteristic feature of dicotyledons?
A.
Single seed leaf
B.
Parallel leaf venation
C.
Vascular bundles in a ring
D.
Fibrous root system
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Solution
Dicotyledons typically have vascular bundles arranged in a ring and two seed leaves (cotyledons).
Correct Answer:
C
— Vascular bundles in a ring
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Q. Which of the following is a characteristic feature of Gram-negative bacteria?
A.
Thick peptidoglycan layer
B.
Outer membrane containing lipopolysaccharides
C.
Staining purple in Gram stain
D.
Sensitive to penicillin
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Solution
Gram-negative bacteria have an outer membrane that contains lipopolysaccharides, which is a key characteristic distinguishing them from Gram-positive bacteria.
Correct Answer:
B
— Outer membrane containing lipopolysaccharides
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Q. Which of the following is a characteristic feature of gymnosperms?
A.
Flowers
B.
Fruits
C.
Naked seeds
D.
Broad leaves
Show solution
Solution
Gymnosperms are known for having naked seeds, which are not enclosed in an ovary.
Correct Answer:
C
— Naked seeds
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Q. Which of the following is a characteristic feature of mammals?
A.
Feathers
B.
Scales
C.
Hair or fur
D.
Gills
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Solution
Mammals are characterized by the presence of hair or fur, which is a key feature distinguishing them from other animal groups.
Correct Answer:
C
— Hair or fur
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Q. Which of the following is a characteristic feature of monocots?
A.
Two seed leaves
B.
Parallel leaf venation
C.
Woody stems
D.
Taproot system
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Solution
Monocots, such as grasses, are characterized by parallel leaf venation and typically have one seed leaf.
Correct Answer:
B
— Parallel leaf venation
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Q. Which of the following is a characteristic feature of monocotyledons?
A.
Two seed leaves
B.
Parallel leaf venation
C.
Vascular bundles in a ring
D.
Taproot system
Show solution
Solution
Monocots are characterized by having one seed leaf (cotyledon) and typically exhibit parallel venation in their leaves.
Correct Answer:
B
— Parallel leaf venation
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Q. Which of the following is a characteristic feature of the Angiosperms?
A.
Presence of seeds
B.
Production of flowers
C.
Presence of vascular tissue
D.
Ability to photosynthesize
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Solution
Angiosperms are defined by their ability to produce flowers, which are key to their reproductive process.
Correct Answer:
B
— Production of flowers
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Q. Which of the following is a characteristic of a dominant allele?
A.
It is always expressed in the phenotype
B.
It can be masked by a recessive allele
C.
It is only expressed in homozygous conditions
D.
It is less common in a population
Show solution
Solution
A dominant allele is expressed in the phenotype even when only one copy is present, masking the effect of a recessive allele.
Correct Answer:
A
— It is always expressed in the phenotype
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Q. Which of the following is a characteristic of a high-level disinfectant?
A.
Effective against all bacteria
B.
Effective against spores
C.
Requires heat for activation
D.
Can be used on skin
Show solution
Solution
High-level disinfectants are effective against spores, making them suitable for critical items.
Correct Answer:
B
— Effective against spores
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Q. Which of the following is a characteristic of a recessive trait?
A.
Expressed in homozygous individuals only
B.
Expressed in heterozygous individuals
C.
Always expressed
D.
Dominates over other traits
Show solution
Solution
A recessive trait is expressed only in homozygous individuals, meaning both alleles must be recessive.
Correct Answer:
A
— Expressed in homozygous individuals only
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Q. Which of the following is a characteristic of a secondary immune response?
A.
Slower response time
B.
Higher antibody affinity
C.
Lower antibody levels
D.
No memory cells involved
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Solution
The secondary immune response is characterized by a faster response time and higher affinity antibodies due to memory cells.
Correct Answer:
B
— Higher antibody affinity
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Q. Which of the following is a characteristic of adaptive immunity?
A.
Immediate response
B.
Non-specific response
C.
Memory and specificity
D.
Physical barriers
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Solution
Adaptive immunity is characterized by its memory and specificity, allowing for a tailored response to specific pathogens.
Correct Answer:
C
— Memory and specificity
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Q. Which of the following is a characteristic of angiosperms?
A.
Seedless
B.
Naked seeds
C.
Flowers and fruits
D.
Vascular tissue
Show solution
Solution
Angiosperms are characterized by the presence of flowers and fruits, which aid in reproduction and seed dispersal.
Correct Answer:
C
— Flowers and fruits
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Q. Which of the following is a characteristic of autosomal dominant inheritance?
A.
Trait skips generations
B.
Both males and females are equally affected
C.
Affected individuals are always homozygous
D.
Only males can transmit the trait
Show solution
Solution
In autosomal dominant inheritance, both males and females are equally affected, and the trait does not skip generations.
Correct Answer:
B
— Both males and females are equally affected
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Q. Which of the following is a characteristic of biennial plants?
A.
Complete life cycle in one year
B.
Live for more than two years
C.
Require two growing seasons to complete life cycle
D.
Only reproduce once
Show solution
Solution
Biennial plants require two growing seasons to complete their life cycle, typically flowering in the second year.
Correct Answer:
C
— Require two growing seasons to complete life cycle
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Q. Which of the following is a characteristic of dicot plants?
A.
Parallel leaf venation
B.
Vascular bundles scattered
C.
Two seed leaves
D.
Fibrous root system
Show solution
Solution
Dicot plants are characterized by having two seed leaves.
Correct Answer:
C
— Two seed leaves
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Q. Which of the following is a characteristic of dioecious plants?
A.
Both male and female reproductive organs are present on the same plant
B.
Plants have separate male and female individuals
C.
They reproduce only asexually
D.
They do not produce flowers
Show solution
Solution
Dioecious plants have separate male and female individuals, each producing their respective gametes.
Correct Answer:
B
— Plants have separate male and female individuals
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Q. Which of the following is a characteristic of disinfectants?
A.
They are always safe for skin contact
B.
They kill all microorganisms including spores
C.
They are used on inanimate objects
D.
They are effective in the presence of organic matter
Show solution
Solution
Disinfectants are primarily used on inanimate objects to reduce or eliminate pathogenic microorganisms.
Correct Answer:
C
— They are used on inanimate objects
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Q. Which of the following is a characteristic of DNA?
A.
Single-stranded
B.
Contains ribose sugar
C.
Double helix structure
D.
Contains uracil
Show solution
Solution
DNA is characterized by its double helix structure, consisting of two strands wound around each other.
Correct Answer:
C
— Double helix structure
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