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 method of plant reproduction is commonly used in agriculture to produce clones of a desired plant?
A.
Sexual reproduction
B.
Cross-pollination
C.
Asexual reproduction
D.
Seed dispersal
Show solution
Solution
Asexual reproduction, such as cuttings or grafting, allows farmers to produce genetically identical plants with desirable traits.
Correct Answer:
C
— Asexual reproduction
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Q. Which method of reproduction involves the use of spores?
A.
Asexual reproduction
B.
Sexual reproduction
C.
Vegetative propagation
D.
Grafting
Show solution
Solution
Asexual reproduction in plants often involves the use of spores, which can develop into new individuals.
Correct Answer:
A
— Asexual reproduction
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Q. Which microbe is known for producing the antibiotic penicillin?
A.
Bacillus cereus
B.
Penicillium chrysogenum
C.
Streptomyces griseus
D.
Escherichia coli
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Solution
Penicillium chrysogenum is the mold from which the antibiotic penicillin is derived, used to treat bacterial infections.
Correct Answer:
B
— Penicillium chrysogenum
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Q. Which microbe is primarily responsible for the fermentation of bread?
A.
Lactobacillus
B.
Saccharomyces cerevisiae
C.
Aspergillus niger
D.
Clostridium botulinum
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Solution
Saccharomyces cerevisiae, or baker's yeast, is responsible for the fermentation process in bread making.
Correct Answer:
B
— Saccharomyces cerevisiae
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Q. Which microbe is primarily responsible for the fermentation of sauerkraut?
A.
Lactobacillus
B.
Bacillus
C.
Clostridium
D.
Staphylococcus
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Solution
Lactobacillus species are key players in the fermentation process of sauerkraut, converting sugars into lactic acid.
Correct Answer:
A
— Lactobacillus
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Q. Which microbe is primarily responsible for the fermentation process in bread making?
A.
Lactobacillus
B.
Saccharomyces cerevisiae
C.
Rhizobium
D.
Clostridium
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Solution
Saccharomyces cerevisiae, or baker's yeast, ferments sugars to produce carbon dioxide and alcohol, causing bread to rise.
Correct Answer:
B
— Saccharomyces cerevisiae
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Q. Which microbe is used in the production of vinegar?
A.
Lactobacillus
B.
Acetobacter
C.
Saccharomyces
D.
Bacillus
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Solution
Acetobacter is a genus of bacteria that converts ethanol into acetic acid, the main component of vinegar.
Correct Answer:
B
— Acetobacter
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Q. Which microorganism is known for causing cholera?
A.
Vibrio cholerae
B.
Salmonella enterica
C.
Clostridium botulinum
D.
Listeria monocytogenes
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Solution
Vibrio cholerae is the bacterium that causes cholera, a severe diarrheal disease often linked to contaminated water.
Correct Answer:
A
— Vibrio cholerae
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Q. Which microorganism is primarily responsible for causing tuberculosis?
A.
Streptococcus pneumoniae
B.
Mycobacterium tuberculosis
C.
Escherichia coli
D.
Staphylococcus aureus
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Solution
Mycobacterium tuberculosis is the causative agent of tuberculosis, a serious infectious disease that primarily affects the lungs.
Correct Answer:
B
— Mycobacterium tuberculosis
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Q. Which molecular technique is used to amplify a specific DNA segment?
A.
Gel electrophoresis
B.
Polymerase chain reaction (PCR)
C.
DNA sequencing
D.
Cloning
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Solution
Polymerase chain reaction (PCR) is a technique used to amplify a specific DNA segment, making millions of copies of it.
Correct Answer:
B
— Polymerase chain reaction (PCR)
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Q. Which molecular technique is used to amplify DNA?
A.
Gel electrophoresis
B.
PCR
C.
Cloning
D.
Sequencing
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Solution
Polymerase Chain Reaction (PCR) is the technique used to amplify specific DNA sequences, making millions of copies of a target DNA segment.
Correct Answer:
B
— PCR
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Q. Which molecular technique is used to separate DNA fragments by size?
A.
Gel electrophoresis
B.
PCR
C.
Cloning
D.
DNA sequencing
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Solution
Gel electrophoresis is used to separate DNA fragments based on their size, allowing for analysis and comparison.
Correct Answer:
A
— Gel electrophoresis
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Q. Which molecule acts as an electron carrier in the light reactions?
A.
ATP
B.
NADPH
C.
FADH2
D.
RuBP
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Solution
NADPH acts as an electron carrier in the light reactions.
Correct Answer:
B
— NADPH
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Q. Which molecule acts as the electron carrier in the light reactions?
A.
NADP+
B.
FADH2
C.
ATP
D.
RuBP
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Solution
NADP+ acts as the electron carrier, becoming NADPH after accepting electrons.
Correct Answer:
A
— NADP+
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Q. Which molecule acts as the primary electron carrier in the light reactions?
A.
NADP+
B.
FADH2
C.
ATP
D.
ADP
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Solution
NADP+ acts as the primary electron carrier, becoming NADPH after accepting electrons.
Correct Answer:
A
— NADP+
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Q. Which molecule acts as the primary electron donor in the light reactions?
A.
Water
B.
NADP+
C.
Glucose
D.
RuBP
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Solution
Water acts as the primary electron donor in the light reactions, providing electrons.
Correct Answer:
A
— Water
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Q. Which molecule acts as the primary energy carrier in the dark reactions?
A.
ATP
B.
NADPH
C.
Glucose
D.
RuBP
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Solution
ATP is the primary energy carrier used in the dark reactions (Calvin cycle).
Correct Answer:
A
— ATP
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Q. Which molecule acts as the primary energy carrier in the light reactions?
A.
ATP
B.
NADPH
C.
Glucose
D.
RuBP
Show solution
Solution
ATP is the primary energy carrier produced during the light reactions.
Correct Answer:
A
— ATP
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Q. Which molecule is produced as a byproduct of the light reactions?
A.
Glucose
B.
Oxygen
C.
NADPH
D.
ATP
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Solution
Oxygen is released as a byproduct during the light reactions of photosynthesis.
Correct Answer:
B
— Oxygen
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Q. Which molecule is produced as a byproduct of the light-dependent reactions?
A.
Glucose
B.
Oxygen
C.
NADPH
D.
ATP
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Solution
Oxygen is produced as a byproduct of the light-dependent reactions when water molecules are split.
Correct Answer:
B
— Oxygen
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Q. Which molecule is produced during the Calvin cycle in the dark reactions?
A.
NADPH
B.
ATP
C.
Glucose
D.
Oxygen
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Solution
Glucose is produced during the Calvin cycle, which is part of the dark reactions.
Correct Answer:
C
— Glucose
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Q. Which molecule is produced during the light reactions and used in the Calvin cycle?
A.
Oxygen
B.
Glucose
C.
NADPH
D.
Carbon dioxide
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Solution
NADPH is produced during the light reactions and is used in the Calvin cycle for carbon fixation.
Correct Answer:
C
— NADPH
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Q. Which muscle is primarily responsible for the process of inhalation?
A.
Diaphragm
B.
Intercostal muscles
C.
Abdominal muscles
D.
Pectoral muscles
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Solution
The diaphragm contracts and moves downward during inhalation, increasing the thoracic cavity volume.
Correct Answer:
A
— Diaphragm
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Q. Which mutation can result in a premature stop codon?
A.
Silent mutation
B.
Missense mutation
C.
Nonsense mutation
D.
Frameshift mutation
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Solution
A nonsense mutation can result in a premature stop codon, leading to truncated proteins.
Correct Answer:
C
— Nonsense mutation
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Q. Which mutation results in a change in a single amino acid in a protein?
A.
Silent mutation
B.
Nonsense mutation
C.
Missense mutation
D.
Frameshift mutation
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Solution
A missense mutation is a type of mutation that results in the substitution of one amino acid for another in a protein.
Correct Answer:
C
— Missense mutation
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Q. Which nitrogenous base is found in RNA but not in DNA?
A.
Thymine
B.
Uracil
C.
Cytosine
D.
Adenine
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Solution
Uracil is a nitrogenous base found in RNA, replacing thymine which is present in DNA.
Correct Answer:
B
— Uracil
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Q. Which of the following adaptations is crucial for the survival of plants in arid environments?
A.
Broad leaves
B.
Deep roots
C.
High water content
D.
Thick cuticles
Show solution
Solution
Thick cuticles help reduce water loss, making them crucial for survival in arid environments.
Correct Answer:
D
— Thick cuticles
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Q. Which of the following adaptations is NOT typically associated with the evolution of desert plants?
A.
Thick cuticles
B.
Deep root systems
C.
Broad leaves
D.
Water storage tissues
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Solution
Broad leaves are not typically associated with desert plants, which usually have adaptations like thick cuticles and water storage tissues to conserve moisture.
Correct Answer:
C
— Broad leaves
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Q. Which of the following animal groups is characterized by having a notochord at some stage of their life cycle?
A.
Mollusks
B.
Arthropods
C.
Chordates
D.
Echinoderms
Show solution
Solution
Chordates are characterized by having a notochord at some stage in their life cycle, which is a defining feature of this group.
Correct Answer:
C
— Chordates
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Q. Which of the following animal groups is primarily aquatic and has gills for respiration?
A.
Mammals
B.
Birds
C.
Fish
D.
Reptiles
Show solution
Solution
Fish are primarily aquatic animals that use gills to extract oxygen from water.
Correct Answer:
C
— Fish
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