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 flowering plants, how many pollen grains are typically produced by one anther?
Show solution
Solution
One anther usually produces 4 pollen grains per microspore mother cell, leading to 8 pollen grains in total.
Correct Answer:
B
— 8
Learn More →
Q. In mammals, what is the primary purpose of the placenta?
A.
Nutrient absorption
B.
Gas exchange
C.
Waste removal
D.
All of the above
Show solution
Solution
The placenta facilitates nutrient absorption, gas exchange, and waste removal between the mother and the developing fetus.
Correct Answer:
D
— All of the above
Learn More →
Q. In Mendelian genetics, what does a homozygous genotype mean?
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
Show solution
Solution
A homozygous genotype consists of two identical alleles for a specific trait, either dominant or recessive.
Correct Answer:
B
— Two identical alleles for a trait
Learn More →
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 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 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 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 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 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 →
Q. In which part of the plant does cellular respiration primarily occur?
A.
Roots
B.
Leaves
C.
Stems
D.
All parts
Show solution
Solution
Cellular respiration occurs in all parts of the plant, as all cells require energy to function.
Correct Answer:
D
— All parts
Learn More →
Q. In which part of the plant does photosynthesis primarily occur?
A.
Roots
B.
Stems
C.
Leaves
D.
Flowers
Show solution
Solution
Photosynthesis primarily occurs in the leaves, where chloroplasts are abundant.
Correct Answer:
C
— Leaves
Learn More →
Q. In which part of the plant does primary growth occur?
A.
Root tips and shoot tips
B.
Leaves
C.
Flowers
D.
Stems
Show solution
Solution
Primary growth occurs at the root tips and shoot tips, where apical meristems are located.
Correct Answer:
A
— Root tips and shoot tips
Learn More →
Q. In which part of the plant does the majority of water absorption occur?
A.
Stems
B.
Leaves
C.
Roots
D.
Flowers
Show solution
Solution
Roots are primarily responsible for the absorption of water and nutrients from the soil.
Correct Answer:
C
— Roots
Learn More →
Q. In which phase of photosynthesis is ATP synthesized?
A.
Light-dependent reactions
B.
Calvin cycle
C.
Both A and B
D.
None of the above
Show solution
Solution
ATP is synthesized during the light-dependent reactions of photosynthesis.
Correct Answer:
A
— Light-dependent reactions
Learn More →
Showing 121 to 150 of 1474 (50 Pages)
