18 public questions tagged with this topic.
Human activities have accelerated extinction rates to about 100–1000 times the natural background rate.
Ref: NCERT Class 12 Biology Chapter 13: Biodiversity and Conservation Loss of Biodiversity - Causes - Habitat Loss Overexploitation
Alexander von Humboldt observed that species richness increases with increasing explored area, up to a limit.
Ref: NCERT Class 12 Biology Chapter 13: Biodiversity and Conservation Species-Area Relationship
Exponential growth occurs when resources are abundant, allowing populations to grow without limits.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Growth - Exponential and Logistic Models
Restriction enzymes recognize palindromic DNA sequences and cut at specific sites.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Tools - Restriction Enzymes - Molecular Scissors
Bacillus thuringiensis produces Bt toxin, which is used in genetically modified crops for insect resistance.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biocontrol Agents - Bt Baculovirus Trichoderma
Vaccines stimulate the immune system to produce memory cells, providing long-term immunity.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immunity - Acquired Immunity - Active Passive Vaccination
Cytokines are signaling molecules that regulate immune responses, inflammation, and communication between immune cells.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immunity - Innate Immunity - Barriers and Interferons
Paleontology studies fossils to provide evidence of evolutionary changes over time.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Evidences of Evolution - Paleontological and Comparative Anatomy
Genetic drift, along with mutation, gene flow, and selection, disrupts Hardy-Weinberg equilibrium by altering allele frequencies.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Evidences of Evolution - Paleontological and Comparative Anatomy
Fossil records provide direct evidence of evolutionary changes over time.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Evidences of Evolution - Paleontological and Comparative Anatomy
DNA replication is semi-conservative, meaning each new DNA molecule consists of one parental and one newly synthesized strand.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance DNA Replication - Semiconservative and Machinery
During full contraction, the 'H' zone disappears as actin filaments slide over myosin filaments.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle Contraction - Sliding Filament Theory and Regulation
