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 animals is an example of an amphibian?
A.
Frog
B.
Lizard
C.
Shark
D.
Eagle
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Solution
Frogs are a classic example of amphibians, which typically undergo metamorphosis from a larval stage to an adult form.
Correct Answer:
A
— Frog
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Q. Which of the following bases is found in RNA but not in DNA?
A.
Thymine
B.
Uracil
C.
Cytosine
D.
Adenine
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Solution
RNA contains uracil instead of thymine, which is found in DNA.
Correct Answer:
B
— Uracil
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Q. Which of the following best describes a frameshift mutation?
A.
A mutation that changes one amino acid
B.
A mutation that adds or removes nucleotides, altering the reading frame
C.
A mutation that duplicates a segment of DNA
D.
A mutation that occurs in non-coding regions
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Solution
A frameshift mutation occurs when nucleotides are added or removed from the DNA sequence, shifting the reading frame and altering the resulting protein.
Correct Answer:
B
— A mutation that adds or removes nucleotides, altering the reading frame
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Q. Which of the following best describes a recessive allele?
A.
It is always expressed in the phenotype
B.
It can only be expressed in a homozygous condition
C.
It is more common than dominant alleles
D.
It masks the effect of dominant alleles
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Solution
A recessive allele is only expressed in the phenotype when an individual has two copies of that allele (homozygous condition).
Correct Answer:
B
— It can only be expressed in a homozygous condition
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Q. Which of the following best describes a test cross?
A.
Crossing two homozygous individuals
B.
Crossing a homozygous individual with a heterozygous individual
C.
Crossing an individual with an unknown genotype with a homozygous recessive
D.
Crossing two heterozygous individuals
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Solution
A test cross involves crossing an individual with an unknown genotype with a homozygous recessive individual to determine the genotype of the former.
Correct Answer:
C
— Crossing an individual with an unknown genotype with a homozygous recessive
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Q. Which of the following best describes the concept of convergent evolution in plants?
A.
Different species evolve similar traits due to similar environments
B.
Species evolve different traits due to different environments
C.
Species become extinct due to lack of adaptation
D.
Species evolve through hybridization
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Solution
Convergent evolution occurs when different species evolve similar traits due to adapting to similar environmental pressures.
Correct Answer:
A
— Different species evolve similar traits due to similar environments
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Q. Which of the following best describes the process of translation?
A.
DNA is copied into RNA
B.
RNA is converted into a protein
C.
Proteins are degraded
D.
RNA is replicated
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Solution
Translation is the process where the sequence of nucleotides in mRNA is translated into a sequence of amino acids, forming a protein.
Correct Answer:
B
— RNA is converted into a protein
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Q. Which of the following best describes the term 'genotype'?
A.
The physical appearance of an organism
B.
The genetic constitution of an organism
C.
The environmental factors affecting a plant
D.
The evolutionary history of a species
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Solution
Genotype refers to the genetic constitution of an organism, which determines its potential traits.
Correct Answer:
B
— The genetic constitution of an organism
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Q. Which of the following describes a homozygous genotype?
A.
Two different alleles for a trait
B.
Two identical alleles for a trait
C.
One dominant and one recessive allele
D.
A trait that is not expressed
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Solution
A homozygous genotype consists of two identical alleles for a trait, either both dominant or both recessive.
Correct Answer:
B
— Two identical alleles for a trait
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Q. Which of the following describes a mutation?
A.
A change in the DNA sequence
B.
A process of DNA replication
C.
A type of RNA molecule
D.
A form of genetic inheritance
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Solution
A mutation is defined as a change in the DNA sequence that can lead to alterations in gene function.
Correct Answer:
A
— A change in the DNA sequence
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Q. Which of the following describes a phenotype?
A.
The genetic makeup of an organism
B.
The observable characteristics of an organism
C.
The location of a gene on a chromosome
D.
The sequence of nucleotides in DNA
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Solution
A phenotype refers to the observable characteristics or traits of an organism, which result from the interaction of its genotype with the environment.
Correct Answer:
B
— The observable characteristics of an organism
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Q. Which of the following describes the structure of DNA?
A.
Single-stranded helix
B.
Double-stranded helix
C.
Triple-stranded helix
D.
Linear structure
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Solution
DNA is structured as a double-stranded helix, with two strands running antiparallel.
Correct Answer:
B
— Double-stranded helix
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Q. Which of the following diseases is caused by a prion?
A.
HIV/AIDS
B.
Mad Cow Disease
C.
Tuberculosis
D.
Malaria
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Solution
Mad Cow Disease, or Bovine Spongiform Encephalopathy, is caused by prions, which are misfolded proteins that induce abnormal folding of normal proteins.
Correct Answer:
B
— Mad Cow Disease
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Q. Which of the following diseases is caused by a virus?
A.
Tuberculosis
B.
HIV/AIDS
C.
Strep throat
D.
Malaria
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Solution
HIV/AIDS is caused by the human immunodeficiency virus (HIV), which attacks the immune system.
Correct Answer:
B
— HIV/AIDS
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Q. Which of the following disinfectants is effective against spores?
A.
Alcohol
B.
Chlorine
C.
Hydrogen peroxide
D.
Quaternary ammonium compounds
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Solution
Hydrogen peroxide is effective against spores, especially at higher concentrations, making it a suitable disinfectant for various applications.
Correct Answer:
C
— Hydrogen peroxide
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Q. Which of the following factors can affect the rate of photosynthesis?
A.
Light intensity
B.
Carbon dioxide concentration
C.
Temperature
D.
All of the above
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Solution
All of the above factors can affect the rate of photosynthesis.
Correct Answer:
D
— All of the above
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Q. Which of the following factors can affect the rate of respiration in plants?
A.
Temperature
B.
Light intensity
C.
Soil moisture
D.
All of the above
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Solution
All of the above factors can affect the rate of respiration in plants, influencing their metabolic processes.
Correct Answer:
D
— All of the above
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Q. Which of the following factors can limit the rate of photosynthesis?
A.
Light intensity
B.
Carbon dioxide concentration
C.
Temperature
D.
All of the above
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Solution
All of the above factors can limit the rate of photosynthesis.
Correct Answer:
D
— All of the above
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Q. Which of the following factors does NOT affect the efficacy of a disinfectant?
A.
Concentration of the disinfectant
B.
Presence of organic matter
C.
Temperature
D.
Color of the disinfectant
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Solution
The color of the disinfectant does not affect its efficacy; however, concentration, organic matter, and temperature do.
Correct Answer:
D
— Color of the disinfectant
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Q. Which of the following factors does NOT affect the efficacy of disinfectants?
A.
Concentration of the disinfectant
B.
Contact time
C.
Type of microorganism
D.
Color of the disinfectant
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Solution
The color of the disinfectant does not affect its efficacy; however, concentration, contact time, and type of microorganism do.
Correct Answer:
D
— Color of the disinfectant
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Q. Which of the following factors does NOT affect the efficacy of disinfection?
A.
Concentration of the disinfectant
B.
Contact time
C.
Temperature
D.
Color of the disinfectant
Show solution
Solution
The color of the disinfectant does not affect its efficacy; however, concentration, contact time, and temperature do.
Correct Answer:
D
— Color of the disinfectant
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Q. Which of the following factors does NOT affect the rate of photosynthesis?
A.
Light intensity
B.
Temperature
C.
Soil pH
D.
Carbon dioxide concentration
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Solution
Soil pH does not directly affect the rate of photosynthesis, unlike the other factors.
Correct Answer:
C
— Soil pH
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Q. Which of the following groups of plants is classified as non-vascular?
A.
Mosses
B.
Ferns
C.
Conifers
D.
Flowering plants
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Solution
Mosses are classified as non-vascular plants because they lack specialized tissues for water and nutrient transport.
Correct Answer:
A
— Mosses
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Q. Which of the following is a benefit of asexual reproduction in plants?
A.
Increased genetic diversity
B.
Faster population growth
C.
Dependency on pollinators
D.
Formation of seeds
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Solution
Asexual reproduction allows for faster population growth since it does not require the time and resources needed for sexual reproduction.
Correct Answer:
B
— Faster population growth
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Q. Which of the following is a benefit of plant classification in agriculture?
A.
Improved pest control
B.
Increased soil erosion
C.
Higher water consumption
D.
Reduced biodiversity
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Solution
Classifying plants allows for better pest control strategies by identifying resistant varieties.
Correct Answer:
A
— Improved pest control
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Q. Which of the following is a benefit of using composting in agriculture?
A.
It increases soil erosion
B.
It reduces soil fertility
C.
It enhances soil microbial diversity
D.
It requires chemical additives
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Solution
Composting enriches soil with organic matter and enhances microbial diversity, improving soil health.
Correct Answer:
C
— It enhances soil microbial diversity
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Q. Which of the following is a benefit of using genetically modified organisms (GMOs) in agriculture?
A.
Increased pesticide use
B.
Higher crop yields
C.
Reduced biodiversity
D.
Longer growing seasons
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Solution
GMOs can lead to higher crop yields by enhancing resistance to pests and diseases.
Correct Answer:
B
— Higher crop yields
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Q. Which of the following is a benefit of using genetically modified organisms (GMOs) in crop production?
A.
Increased susceptibility to pests
B.
Reduced nutritional value
C.
Enhanced resistance to diseases
D.
Decreased yield
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Solution
GMOs can be engineered to enhance resistance to diseases, pests, and environmental conditions, leading to improved crop yields.
Correct Answer:
C
— Enhanced resistance to diseases
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Q. Which of the following is a benefit of using genetically modified organisms (GMOs) in plant reproduction?
A.
Increased genetic diversity
B.
Enhanced resistance to pests and diseases
C.
Slower growth rates
D.
Reduced crop yields
Show solution
Solution
GMOs can be engineered to have enhanced traits, such as pest resistance, which can lead to higher crop yields and reduced reliance on chemical pesticides.
Correct Answer:
B
— Enhanced resistance to pests and diseases
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Q. Which of the following is a benefit of using microbes in bioremediation?
A.
They increase soil erosion
B.
They can degrade pollutants
C.
They promote invasive species
D.
They reduce biodiversity
Show solution
Solution
Microbes used in bioremediation can degrade pollutants, helping to clean up contaminated environments.
Correct Answer:
B
— They can degrade pollutants
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