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. In Mendelian genetics, what does the term 'allele' refer to?
A.
A variant form of a gene
B.
A type of chromosome
C.
A phenotype
D.
A genetic disorder
Show solution
Solution
An allele is a variant form of a gene that can result in different traits.
Correct Answer:
A
— A variant form of a gene
Learn More →
Q. In Mendelian genetics, what does the term 'homozygous' refer to?
A.
Having two different alleles for a trait
B.
Having two identical alleles for a trait
C.
The physical expression of a trait
D.
The genetic makeup of an organism
Show solution
Solution
Homozygous refers to having two identical alleles for a particular trait, either dominant or recessive.
Correct Answer:
B
— Having two identical alleles for a trait
Learn More →
Q. In Mendelian genetics, what is the expected phenotypic ratio of a monohybrid cross?
A.
1:1
B.
3:1
C.
9:3:3:1
D.
1:2:1
Show solution
Solution
The expected phenotypic ratio of a monohybrid cross is 3:1, where three offspring display the dominant trait and one displays the recessive trait.
Correct Answer:
B
— 3:1
Learn More →
Q. In plant biotechnology, what is the significance of the term 'bioreactor'?
A.
A device for photosynthesis
B.
A system for growing microorganisms
C.
A vessel for cultivating plant cells or tissues
D.
A method for soil analysis
Show solution
Solution
A bioreactor is a vessel used for cultivating plant cells or tissues under controlled conditions, often used in tissue culture and biotechnology applications.
Correct Answer:
C
— A vessel for cultivating plant cells or tissues
Learn More →
Q. In plant taxonomy, what does the term 'monocot' refer to?
A.
One seed leaf
B.
Two seed leaves
C.
Multiple seed leaves
D.
No seed leaves
Show solution
Solution
The term 'monocot' refers to plants that have one seed leaf.
Correct Answer:
A
— One seed leaf
Learn More →
Q. In plant taxonomy, what is the highest rank in the classification hierarchy?
A.
Family
B.
Genus
C.
Species
D.
Kingdom
Show solution
Solution
The highest rank in the classification hierarchy is the Kingdom, which includes all plant life.
Correct Answer:
D
— Kingdom
Learn More →
Q. In plant taxonomy, which of the following ranks is directly below 'Kingdom'?
A.
Class
B.
Order
C.
Family
D.
Genus
Show solution
Solution
The rank directly below 'Kingdom' in the biological classification system is 'Phylum', which is often referred to as 'Division' in the context of plants.
Correct Answer:
A
— Class
Learn More →
Q. In plant taxonomy, which rank is directly below the family level?
A.
Genus
B.
Species
C.
Order
D.
Class
Show solution
Solution
The genus is the taxonomic rank that is directly below the family level in the hierarchy of biological classification.
Correct Answer:
A
— Genus
Learn More →
Q. In plants, what is the function of the gene promoter?
A.
To code for proteins
B.
To initiate transcription
C.
To replicate DNA
D.
To repair DNA
Show solution
Solution
The gene promoter is a region of DNA that initiates transcription of a particular gene.
Correct Answer:
B
— To initiate transcription
Learn More →
Q. In plants, what is the role of the flower in reproduction?
A.
Photosynthesis
B.
Water absorption
C.
Pollination and fertilization
D.
Nutrient storage
Show solution
Solution
The flower is the reproductive structure in flowering plants, facilitating pollination and fertilization to produce seeds.
Correct Answer:
C
— Pollination and fertilization
Learn More →
Q. In plants, what is the significance of genetic variation?
A.
It decreases adaptability
B.
It enhances survival and reproduction
C.
It leads to uniformity in traits
D.
It is irrelevant to evolution
Show solution
Solution
Genetic variation enhances survival and reproduction by allowing populations to adapt to changing environments.
Correct Answer:
B
— It enhances survival and reproduction
Learn More →
Q. In plants, what is the term for the physical location of a gene on a chromosome?
A.
Allele
B.
Locus
C.
Phenotype
D.
Genotype
Show solution
Solution
The term 'locus' refers to the specific physical location of a gene on a chromosome.
Correct Answer:
B
— Locus
Learn More →
Q. In recombinant DNA technology, what is the role of a vector?
A.
To cut DNA
B.
To amplify RNA
C.
To transport DNA into a host cell
D.
To visualize proteins
Show solution
Solution
Vectors are DNA molecules used to deliver foreign genetic material into a host cell for replication.
Correct Answer:
C
— To transport DNA into a host cell
Learn More →
Q. In recombinant DNA technology, what is the role of restriction enzymes?
A.
To amplify DNA
B.
To cut DNA at specific sequences
C.
To ligate DNA fragments
D.
To transcribe RNA
Show solution
Solution
Restriction enzymes cut DNA at specific sequences, allowing for the insertion of DNA fragments into vectors.
Correct Answer:
B
— To cut DNA at specific sequences
Learn More →
Q. In terms of ecological applications, why is plant taxonomy important?
A.
It helps in identifying edible plants.
B.
It aids in understanding plant diseases.
C.
It assists in conservation efforts.
D.
All of the above.
Show solution
Solution
Plant taxonomy is crucial for identifying edible plants, understanding diseases, and aiding conservation efforts.
Correct Answer:
D
— All of the above.
Learn More →
Q. In the absence of light, which process will cease in plants?
A.
Photosynthesis
B.
Respiration
C.
Transpiration
D.
Glycolysis
Show solution
Solution
Photosynthesis will cease in the absence of light, as it relies on light energy.
Correct Answer:
A
— Photosynthesis
Learn More →
Q. In the context of gene expression, what is the function of a promoter?
A.
To enhance mRNA stability
B.
To initiate transcription
C.
To terminate transcription
D.
To splice introns
Show solution
Solution
A promoter is a DNA sequence that initiates transcription by providing a binding site for RNA polymerase.
Correct Answer:
B
— To initiate transcription
Learn More →
Q. In the context of gene expression, what is the role of mRNA?
A.
To store genetic information
B.
To transport amino acids
C.
To carry the genetic code from DNA to ribosomes
D.
To catalyze biochemical reactions
Show solution
Solution
mRNA (messenger RNA) carries the genetic code from DNA to ribosomes, where proteins are synthesized.
Correct Answer:
C
— To carry the genetic code from DNA to ribosomes
Learn More →
Q. In the context of the central dogma, what does 'translation' refer to?
A.
The process of copying DNA into RNA
B.
The synthesis of proteins from mRNA
C.
The replication of DNA
D.
The modification of RNA
Show solution
Solution
Translation is the process by which ribosomes synthesize proteins based on the sequence of mRNA.
Correct Answer:
B
— The synthesis of proteins from mRNA
Learn More →
Q. In the light reactions of photosynthesis, which molecule is produced as a byproduct?
A.
Glucose
B.
Oxygen
C.
NADPH
D.
ATP
Show solution
Solution
Oxygen is produced as a byproduct during the light reactions of photosynthesis.
Correct Answer:
B
— Oxygen
Learn More →
Q. In which ecological role do plants primarily function?
A.
Decomposers
B.
Primary producers
C.
Predators
D.
Parasites
Show solution
Solution
Plants primarily function as primary producers in ecosystems, converting sunlight into energy through photosynthesis.
Correct Answer:
B
— Primary producers
Learn More →
Q. In which group of animals does external fertilization primarily occur?
A.
Mammals
B.
Birds
C.
Amphibians
D.
Reptiles
Show solution
Solution
Amphibians typically undergo external fertilization, where eggs are fertilized outside the female's body.
Correct Answer:
C
— Amphibians
Learn More →
Q. In which part of the cell does transcription occur?
A.
Nucleus
B.
Cytoplasm
C.
Ribosome
D.
Mitochondria
Show solution
Solution
Transcription occurs in the nucleus where DNA is transcribed into mRNA.
Correct Answer:
A
— Nucleus
Learn More →
Q. In which part of the chloroplast do the light reactions occur?
A.
Stroma
B.
Thylakoid membranes
C.
Outer membrane
D.
Inner membrane
Show solution
Solution
The light reactions of photosynthesis occur in the thylakoid membranes of the chloroplast.
Correct Answer:
B
— Thylakoid membranes
Learn More →
Q. In which part of the chloroplast do the light reactions of photosynthesis occur?
A.
Stroma
B.
Thylakoid membranes
C.
Cytoplasm
D.
Outer membrane
Show solution
Solution
The light reactions occur in the thylakoid membranes of the chloroplast.
Correct Answer:
B
— Thylakoid membranes
Learn More →
Q. In which part of the chloroplast do the light-dependent reactions occur?
A.
Stroma
B.
Thylakoid membranes
C.
Outer membrane
D.
Inner membrane
Show solution
Solution
The light-dependent reactions occur in the thylakoid membranes of the chloroplast.
Correct Answer:
B
— Thylakoid membranes
Learn More →
Q. In which part of the chloroplast do the light-dependent reactions of photosynthesis occur?
A.
Stroma
B.
Thylakoid membranes
C.
Outer membrane
D.
Inner membrane
Show solution
Solution
The light-dependent reactions occur in the thylakoid membranes of the chloroplast.
Correct Answer:
B
— Thylakoid membranes
Learn More →
Q. In which part of the chloroplast does the Calvin cycle occur?
A.
Thylakoid membranes
B.
Outer membrane
C.
Stroma
D.
Inner membrane
Show solution
Solution
The Calvin cycle occurs in the stroma of the chloroplast.
Correct Answer:
C
— Stroma
Learn More →
Q. In which part of the flower does fertilization typically occur?
A.
Ovary
B.
Stigma
C.
Anther
D.
Style
Show solution
Solution
Fertilization typically occurs in the ovary, where the ovule is located.
Correct Answer:
A
— Ovary
Learn More →
Q. In which part of the human body does gas exchange primarily occur?
A.
Bronchi
B.
Alveoli
C.
Trachea
D.
Lungs
Show solution
Solution
Gas exchange primarily occurs in the alveoli, which are tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.
Correct Answer:
B
— Alveoli
Learn More →
Showing 151 to 180 of 1731 (58 Pages)
