Chapter 9 – Heredity and Evolution – MCQs
Chapter 9 – Heredity and Evolution – MCQs (Part 1: Q1–Q25)
Q1. The unit of heredity is:
a) Chromosome
b) Gene ✅
c) DNA
d) Trait
Answer: b) Gene
Explanation: Genes are segments of DNA that determine specific traits and are the basic unit of heredity.
Q2. Which structure carries hereditary information?
a) Mitochondria
b) Nucleus ✅
c) Ribosome
d) Lysosome
Answer: b) Nucleus
Explanation: The nucleus contains chromosomes made of DNA, which carry genetic information.
Q3. The physical appearance of an organism is called:
a) Genotype
b) Phenotype ✅
c) Hybrid
d) Allele
Answer: b) Phenotype
Explanation: Phenotype refers to the observable traits expressed due to genotype and environment.
Q4. The ratio obtained in Mendel’s monohybrid cross is:
a) 1:2:1
b) 3:1 ✅
c) 9:3:3:1
d) 2:1
Answer: b) 3:1
Explanation: In monohybrid cross (e.g., tall × dwarf pea plants), the F2 generation shows a 3:1 phenotypic ratio.
Q5. The ratio obtained in Mendel’s dihybrid cross is:
a) 1:2:1
b) 3:1
c) 9:3:3:1 ✅
d) 2:1
Answer: c) 9:3:3:1
Explanation: In dihybrid cross, Mendel observed independent assortment leading to this ratio in F2 generation.
Q6. The alternate forms of a gene are called:
a) Chromosomes
b) Alleles ✅
c) Phenotypes
d) Genotypes
Answer: b) Alleles
Explanation: Alleles are different forms of the same gene, e.g., tall (T) and dwarf (t).
Q7. Which of the following is a recessive trait in pea plants?
a) Round seed
b) Green pod
c) Dwarf stem ✅
d) Tall stem
Answer: c) Dwarf stem
Explanation: Tallness is dominant in pea plants, while dwarfness is recessive.
Q8. The hereditary material in humans is:
a) RNA
b) DNA ✅
c) Protein
d) Carbohydrate
Answer: b) DNA
Explanation: DNA (deoxyribonucleic acid) carries genetic instructions in humans.
Q9. Who is known as the “Father of Genetics”?
a) Charles Darwin
b) Gregor Mendel ✅
c) Lamarck
d) Hugo de Vries
Answer: b) Gregor Mendel
Explanation: Mendel is called the father of genetics for his pea plant experiments.
Q10. Which of the following is a sex-linked disorder?
a) Hemophilia ✅
b) Diabetes
c) Asthma
d) Tuberculosis
Answer: a) Hemophilia
Explanation: Hemophilia is caused by a defective gene on the X chromosome.
Q11. Variation is important for:
a) Reproduction
b) Evolution ✅
c) Photosynthesis
d) Respiration
Answer: b) Evolution
Explanation: Variations provide differences in traits that may help in survival and evolution.
Q12. Which scientist proposed the theory of natural selection?
a) Gregor Mendel
b) Charles Darwin ✅
c) Hugo de Vries
d) Watson and Crick
Answer: b) Charles Darwin
Explanation: Darwin proposed natural selection as the mechanism of evolution.
Q13. Which of the following helps in determining sex in humans?
a) Chromosome 21
b) X and Y chromosomes ✅
c) Mitochondrial DNA
d) Ribosomal RNA
Answer: b) X and Y chromosomes
Explanation: XX results in female, XY results in male in humans.
Q14. In humans, the number of pairs of chromosomes is:
a) 20
b) 22
c) 23 ✅
d) 24
Answer: c) 23
Explanation: Humans have 23 pairs (46 chromosomes) including 22 pairs of autosomes and 1 pair of sex chromosomes.
Q15. The chromosomal basis of sex determination in humans was discovered by:
a) Mendel
b) Stevens and Wilson ✅
c) Darwin
d) Morgan
Answer: b) Stevens and Wilson
Explanation: They independently discovered the role of XY chromosomes in sex determination.
Q16. Evolution is defined as:
a) Sudden change in traits
b) Gradual development of organisms ✅
c) Formation of gametes
d) Heredity transfer
Answer: b) Gradual development of organisms
Explanation: Evolution is the gradual change in living organisms over generations.
Q17. Which structure is vestigial in humans?
a) Appendix ✅
b) Heart
c) Kidney
d) Lungs
Answer: a) Appendix
Explanation: Appendix has lost its original function of digestion in humans, making it vestigial.
Q18. Which gas was absent in the primitive atmosphere of Earth?
a) Oxygen ✅
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: a) Oxygen
Explanation: Primitive atmosphere lacked free oxygen, which appeared later due to photosynthesis.
Q19. The similarity in forelimbs of humans, cats, and whales is an example of:
a) Homologous organs ✅
b) Analogous organs
c) Vestigial organs
d) Mutation
Answer: a) Homologous organs
Explanation: Similar structure but different functions indicate common ancestry.
Q20. The wings of birds and bats are examples of:
a) Homologous organs
b) Analogous organs ✅
c) Vestigial organs
d) Recessive traits
Answer: b) Analogous organs
Explanation: Same function (flying), but different structures, hence analogous.
Q21. The hereditary material in most organisms is:
a) RNA
b) DNA ✅
c) Protein
d) Starch
Answer: b) DNA
Explanation: DNA stores hereditary information in almost all organisms.
Q22. Acquired characters are:
a) Inherited
b) Not inherited ✅
c) Always inherited
d) Determined by mutation
Answer: b) Not inherited
Explanation: Traits acquired during lifetime (e.g., learning, bodybuilding) are not inherited.
Q23. Which scientist explained the inheritance of acquired characters?
a) Mendel
b) Lamarck ✅
c) Darwin
d) Morgan
Answer: b) Lamarck
Explanation: Lamarck proposed that traits acquired during life could be passed on (though disproved later).
Q24. The term “survival of the fittest” was given by:
a) Darwin
b) Herbert Spencer ✅
c) Mendel
d) Wallace
Answer: b) Herbert Spencer
Explanation: Though Darwin proposed natural selection, Spencer coined the phrase.
Q25. Which of the following evidences supports evolution?
a) Fossils ✅
b) Photosynthesis
c) Respiration
d) Symbiosis
Answer: a) Fossils
Explanation: Fossils provide direct evidence of past life and evolutionary history.
Heredity and Evolution – MCQs (Part 2: Q26–Q50)
Q26. The process by which traits are passed from parents to offspring is called:
a) Evolution
b) Heredity ✅
c) Mutation
d) Variation
Answer: b) Heredity
Explanation: Heredity is the transmission of traits from one generation to another.
Q27. The first filial generation (F1) obtained in Mendel’s monohybrid cross is:
a) All dominant ✅
b) All recessive
c) Half dominant and half recessive
d) Mixed
Answer: a) All dominant
Explanation: Mendel observed only dominant trait expression in the F1 generation.
Q28. A cross between two organisms differing in two traits is called:
a) Monohybrid cross
b) Dihybrid cross ✅
c) Test cross
d) Back cross
Answer: b) Dihybrid cross
Explanation: Dihybrid cross involves inheritance of two characters at the same time.
Q29. Which of the following is a vestigial organ in snakes?
a) Limbs ✅
b) Heart
c) Lungs
d) Tongue
Answer: a) Limbs
Explanation: Some snakes have small rudimentary hind limb bones, showing evolutionary history.
Q30. The genotype of offspring produced in a cross between Tt × Tt is:
a) TT, Tt, tt ✅
b) TT only
c) Tt only
d) tt only
Answer: a) TT, Tt, tt
Explanation: A cross between heterozygotes produces all three genotypes (1:2:1).
Q31. Which of the following is an example of acquired trait?
a) Blood group
b) Tallness
c) Language learned ✅
d) Eye color
Answer: c) Language learned
Explanation: Acquired traits are developed during lifetime, not inherited genetically.
Q32. In human males, which chromosome is responsible for maleness?
a) X
b) Y ✅
c) XX
d) XY
Answer: b) Y
Explanation: The presence of Y chromosome decides maleness in humans.
Q33. The sex of a child in humans is determined by:
a) Mother
b) Father ✅
c) Both equally
d) Environmental conditions
Answer: b) Father
Explanation: The sperm carries either X or Y chromosome, determining the sex of the child.
Q34. Evolutionary relationships are best studied through:
a) Anatomy
b) Fossils ✅
c) Behavior
d) Nutrition
Answer: b) Fossils
Explanation: Fossils provide direct evidence of ancestry and evolutionary changes.
Q35. The process by which new species arise from existing species is:
a) Mutation
b) Speciation ✅
c) Evolution
d) Heredity
Answer: b) Speciation
Explanation: Speciation is the formation of new species due to evolution and isolation.
Q36. Who proposed the theory of inheritance of acquired characters?
a) Lamarck ✅
b) Darwin
c) Mendel
d) Morgan
Answer: a) Lamarck
Explanation: Lamarck suggested acquired traits could be passed to next generations (though disproved later).
Q37. The study of fossils is called:
a) Genetics
b) Paleontology ✅
c) Archaeology
d) Anthropology
Answer: b) Paleontology
Explanation: Fossils are studied in paleontology to understand evolutionary history.
Q38. The wings of insects and birds represent:
a) Homologous organs
b) Analogous organs ✅
c) Vestigial organs
d) None
Answer: b) Analogous organs
Explanation: Wings of insects and birds serve the same function (flight) but have different structural origin.
Q39. Which one of the following pairs is an example of homologous organs?
a) Wings of bat and bird
b) Forelimb of man and flipper of whale ✅
c) Wings of insect and bat
d) Wings of bird and butterfly
Answer: b) Forelimb of man and flipper of whale
Explanation: These have similar internal structures but different functions, showing common ancestry.
Q40. Which scientist is associated with the mutation theory of evolution?
a) Darwin
b) Hugo de Vries ✅
c) Lamarck
d) Mendel
Answer: b) Hugo de Vries
Explanation: He proposed sudden mutations as a cause of evolution.
Q41. Which blood group is considered a universal donor?
a) A
b) B
c) AB
d) O ✅
Answer: d) O
Explanation: Blood group O can be donated to any other group because it lacks antigens A and B.
Q42. The genetic material in bacteria is:
a) DNA ✅
b) RNA
c) Protein
d) Cell wall
Answer: a) DNA
Explanation: Bacteria have circular DNA as their hereditary material.
Q43. Evolutionary evidence drawn from embryology shows:
a) Similarity in adult forms
b) Similar stages in development ✅
c) Fossil similarities
d) Different structures
Answer: b) Similar stages in development
Explanation: Embryos of different vertebrates show striking similarities in early stages.
Q44. The number of chromosomes in human gametes is:
a) 23 ✅
b) 46
c) 44
d) 22
Answer: a) 23
Explanation: Human gametes (sperm/egg) are haploid, with 23 chromosomes.
Q45. Which of the following evidences does not support evolution?
a) Homologous organs
b) Analogous organs
c) Vestigial organs
d) Balanced diet ✅
Answer: d) Balanced diet
Explanation: Balanced diet is unrelated to evolutionary evidence.
Q46. Which concept explains similarity in bone structure of vertebrate forelimbs?
a) Analogy
b) Homology ✅
c) Vestigiality
d) Mutation
Answer: b) Homology
Explanation: Homologous organs show same structural design but perform different functions.
Q47. Who disproved Lamarck’s theory of acquired characters?
a) Charles Darwin ✅
b) Mendel
c) Morgan
d) Wallace
Answer: a) Charles Darwin
Explanation: Darwin’s theory of natural selection replaced Lamarck’s idea of acquired traits.
Q48. Fossils of Archaeopteryx show features of:
a) Fish and Amphibians
b) Reptiles and Birds ✅
c) Amphibians and Mammals
d) Mammals and Birds
Answer: b) Reptiles and Birds
Explanation: Archaeopteryx is a connecting link between reptiles and birds.
Q49. Which term refers to sudden changes in DNA sequence?
a) Evolution
b) Mutation ✅
c) Heredity
d) Variation
Answer: b) Mutation
Explanation: Mutation is a sudden change in DNA that introduces variation.
Q50. The blood group considered universal recipient is:
a) A
b) B
c) AB ✅
d) O
Answer: c) AB
Explanation: Group AB has both antigens and no antibodies, so can receive blood from all groups.
Heredity and Evolution – MCQs (Part 3: Q51–Q75)
Q51. Which of the following determines the sex of a child in humans?
a) Egg cell
b) Sperm cell ✅
c) Both equally
d) Environment
Answer: b) Sperm cell
Explanation: The ovum always contributes an X chromosome; sperm may contribute X (female) or Y (male).
Q52. In pea plants, tallness is dominant over dwarfness. Crossing Tt × Tt gives phenotypic ratio:
a) 1:2:1
b) 3:1 ✅
c) 9:3:3:1
d) 2:1
Answer: b) 3:1
Explanation: In monohybrid cross, three tall and one dwarf are obtained in F2 generation.
Q53. The theory of evolution by natural selection was proposed by:
a) Darwin ✅
b) Lamarck
c) Mendel
d) Hugo de Vries
Answer: a) Darwin
Explanation: Darwin explained that organisms better adapted survive and reproduce more.
Q54. Which of the following is a vestigial organ in humans?
a) Kidney
b) Wisdom teeth ✅
c) Heart
d) Liver
Answer: b) Wisdom teeth
Explanation: Wisdom teeth have lost their function with dietary evolution and are vestigial.
Q55. A cross between F1 hybrid and its parent is called:
a) Monohybrid cross
b) Test cross ✅
c) Dihybrid cross
d) Back cross
Answer: b) Test cross
Explanation: Test cross helps to determine whether the F1 hybrid is heterozygous or homozygous.
Q56. Which organ is vestigial in whales?
a) Fins
b) Hind limbs ✅
c) Blowhole
d) Tail
Answer: b) Hind limbs
Explanation: Whales have rudimentary hind limb bones, proving their evolutionary ancestry.
Q57. The sudden appearance of inherited changes in organisms is called:
a) Variation
b) Mutation ✅
c) Adaptation
d) Evolution
Answer: b) Mutation
Explanation: Mutation refers to sudden heritable changes in genetic material.
Q58. Which law of Mendel is also called the “Law of Purity of Gametes”?
a) Law of Dominance ✅
b) Law of Segregation
c) Law of Independent Assortment
d) Law of Variation
Answer: a) Law of Dominance
Explanation: Law of Segregation (also termed purity of gametes) states that alleles segregate without mixing.
Q59. Which of the following indicates adaptive radiation?
a) Darwin’s finches ✅
b) Mendel’s peas
c) Human blood groups
d) Fossils
Answer: a) Darwin’s finches
Explanation: Adaptive radiation occurs when organisms diversify rapidly, like Darwin’s finches on Galapagos islands.
Q60. The human blood group system was discovered by:
a) Watson and Crick
b) Karl Landsteiner ✅
c) Gregor Mendel
d) Lamarck
Answer: b) Karl Landsteiner
Explanation: He discovered the ABO blood group system.
Q61. Which of the following is an example of variation?
a) Identical twins
b) Difference in height among students ✅
c) Same eye colour
d) Same blood group
Answer: b) Difference in height among students
Explanation: Variations are differences among individuals of the same species.
Q62. Which type of reproduction introduces more variation?
a) Asexual reproduction
b) Sexual reproduction ✅
c) Binary fission
d) Budding
Answer: b) Sexual reproduction
Explanation: Sexual reproduction leads to genetic recombination and variation.
Q63. The organs which perform different functions but have similar structure are:
a) Analogous
b) Homologous ✅
c) Vestigial
d) Rudimentary
Answer: b) Homologous
Explanation: Homologous organs indicate common ancestry.
Q64. Which of the following is an example of analogous organs?
a) Flippers of whale and fins of fish
b) Wings of bat and forelimbs of man
c) Wings of butterfly and bird ✅
d) Arms of man and legs of horse
Answer: c) Wings of butterfly and bird
Explanation: These have similar function (flight) but different structural design.
Q65. The study of fossils shows:
a) Sudden creation of organisms
b) Evolution of life forms over time ✅
c) Stability of species
d) Inheritance of acquired traits
Answer: b) Evolution of life forms over time
Explanation: Fossils provide evidence for gradual evolutionary changes.
Q66. Who explained the chromosomal theory of inheritance?
a) Sutton and Boveri ✅
b) Darwin
c) Mendel
d) Watson
Answer: a) Sutton and Boveri
Explanation: They linked Mendel’s factors to chromosomes, proving chromosomal theory of inheritance.
Q67. Who discovered sex-linked inheritance in Drosophila?
a) Mendel
b) T.H. Morgan ✅
c) Darwin
d) Lamarck
Answer: b) T.H. Morgan
Explanation: Morgan demonstrated sex-linked inheritance using fruit fly experiments.
Q68. Which of the following is NOT an example of vestigial organ?
a) Appendix
b) Coccyx
c) Kidney ✅
d) Wisdom teeth
Answer: c) Kidney
Explanation: Kidney is a fully functional organ, not vestigial.
Q69. What is the chromosome number in human somatic cells?
a) 23
b) 22
c) 46 ✅
d) 44
Answer: c) 46
Explanation: Humans have 23 pairs, i.e., 46 chromosomes in somatic cells.
Q70. Which of the following pairs represents vestigial structures in humans?
a) Nails and skin
b) Appendix and coccyx ✅
c) Heart and lungs
d) Eyes and ears
Answer: b) Appendix and coccyx
Explanation: Both appendix and coccyx have lost their original functions.
Q71. Which scientist is associated with the phrase “struggle for existence”?
a) Darwin ✅
b) Mendel
c) Lamarck
d) Morgan
Answer: a) Darwin
Explanation: Darwin emphasized that organisms struggle for survival and only the fittest survive.
Q72. Which of the following represents a connecting link?
a) Bat
b) Archaeopteryx ✅
c) Cat
d) Whale
Answer: b) Archaeopteryx
Explanation: Archaeopteryx shows features of both reptiles and birds, making it a connecting link.
Q73. Evolution that results in new species formation is called:
a) Microevolution
b) Macroevolution ✅
c) Artificial selection
d) Mutation
Answer: b) Macroevolution
Explanation: Macroevolution involves large-scale changes leading to speciation.
Q74. The process of breeding plants and animals for desired traits is:
a) Artificial selection ✅
b) Natural selection
c) Speciation
d) Mutation
Answer: a) Artificial selection
Explanation: Humans control breeding to develop desired features, e.g., in crops and cattle.
Q75. Which of the following provides evidence of common ancestry?
a) Homologous organs ✅
b) Analogous organs
c) Acquired traits
d) Balanced diet
Answer: a) Homologous organs
Explanation: Homologous organs indicate organisms evolved from a common ancestor.
Heredity and Evolution – MCQs (Part 4: Q76–Q100)
Q76. Which of the following is an acquired trait?
a) Eye colour
b) Blood group
c) Scar on skin ✅
d) Tongue rolling
Answer: c) Scar on skin
Explanation: Acquired traits develop during lifetime due to environment/injury and are not inherited.
Q77. The human eye colour is determined by:
a) Environmental factors
b) Genes ✅
c) Diet
d) Hormones
Answer: b) Genes
Explanation: Eye colour is a hereditary character controlled by genes.
Q78. The human height is an example of:
a) Discontinuous variation
b) Continuous variation ✅
c) Mutation
d) Acquired character
Answer: b) Continuous variation
Explanation: Human height varies gradually across a range, not in distinct categories.
Q79. Who gave the idea of “inheritance of acquired characters”?
a) Lamarck ✅
b) Darwin
c) Mendel
d) Morgan
Answer: a) Lamarck
Explanation: Lamarck proposed that acquired traits could be passed, though later disproved.
Q80. Who is called the father of modern genetics?
a) Darwin
b) Mendel ✅
c) Lamarck
d) Morgan
Answer: b) Mendel
Explanation: Mendel’s experiments on pea plants laid the foundation of modern genetics.
Q81. The organs which have no apparent function are called:
a) Homologous
b) Vestigial ✅
c) Analogous
d) Rudimentary
Answer: b) Vestigial
Explanation: Vestigial organs are remnants of organs functional in ancestors.
Q82. Which of the following is NOT a vestigial organ in humans?
a) Appendix
b) Coccyx
c) Ear muscles
d) Heart ✅
Answer: d) Heart
Explanation: Heart is vital, not vestigial.
Q83. The similarity in early embryonic development of vertebrates supports:
a) Genetics
b) Common ancestry ✅
c) Mutation
d) Acquired traits
Answer: b) Common ancestry
Explanation: Embryological evidence shows that diverse organisms share a common ancestor.
Q84. Which of the following is an example of artificial selection?
a) Antibiotic resistance
b) Breeding high-yielding cows ✅
c) Natural selection
d) Evolution of giraffe’s neck
Answer: b) Breeding high-yielding cows
Explanation: Humans select desirable traits for breeding = artificial selection.
Q85. The basic event in speciation is:
a) Natural selection
b) Genetic drift
c) Reproductive isolation ✅
d) Mutation
Answer: c) Reproductive isolation
Explanation: Reproductive isolation prevents interbreeding and leads to formation of new species.
Q86. The cross between TT (tall) and tt (dwarf) gives all tall offspring. This shows:
a) Law of segregation
b) Law of dominance ✅
c) Law of independent assortment
d) Mutation theory
Answer: b) Law of dominance
Explanation: The dominant allele (T) masks the effect of recessive allele (t).
Q87. Evolution is:
a) Change in individuals
b) Change in species over generations ✅
c) Sudden mutation only
d) Acquired traits only
Answer: b) Change in species over generations
Explanation: Evolution involves gradual changes in populations over time.
Q88. The blood group inheritance in humans is an example of:
a) Mutation
b) Multiple alleles ✅
c) Monohybrid cross
d) Polygenic inheritance
Answer: b) Multiple alleles
Explanation: The ABO system is controlled by three alleles: IA, IB, and i.
Q89. Which concept explains that only those organisms survive which are best adapted?
a) Law of dominance
b) Natural selection ✅
c) Mutation theory
d) Artificial selection
Answer: b) Natural selection
Explanation: Darwin’s natural selection states survival of the fittest.
Q90. Which of the following is NOT an example of evolution?
a) Development of antibiotic resistance
b) Peppered moths in England
c) Scar formation after injury ✅
d) Appearance of new species
Answer: c) Scar formation after injury
Explanation: Scars are acquired, not evolutionary changes.
Q91. Which of the following is responsible for genetic variations?
a) Mutation
b) Sexual reproduction
c) Crossing over during meiosis
d) All of these ✅
Answer: d) All of these
Explanation: All processes contribute to genetic variation.
Q92. Which of the following is an example of microevolution?
a) Origin of new species
b) Change in moth colour in England ✅
c) Origin of mammals
d) Evolution of humans
Answer: b) Change in moth colour in England
Explanation: This is a small-scale evolutionary change (microevolution).
Q93. Which organ in man is homologous to wings of birds?
a) Arms ✅
b) Legs
c) Eyes
d) Teeth
Answer: a) Arms
Explanation: Both arms of humans and wings of birds have similar bone structures.
Q94. Which is the source of variation in asexual reproduction?
a) Crossing over
b) Mutation ✅
c) Fertilization
d) Independent assortment
Answer: b) Mutation
Explanation: Asexual reproduction gives identical copies except when mutation occurs.
Q95. Which factor is not important for speciation?
a) Natural selection
b) Reproductive isolation
c) Genetic drift
d) Balanced diet ✅
Answer: d) Balanced diet
Explanation: Balanced diet is unrelated to speciation.
Q96. The forelimb of a human and the wing of a bat are examples of:
a) Homologous organs ✅
b) Analogous organs
c) Vestigial organs
d) Rudimentary organs
Answer: a) Homologous organs
Explanation: They have same structure but different functions.
Q97. Which scientist is associated with the “germplasm theory”?
a) Weismann ✅
b) Darwin
c) Mendel
d) Lamarck
Answer: a) Weismann
Explanation: Weismann proposed that hereditary information is carried in germ cells.
Q98. Which is an example of adaptive radiation?
a) Evolution of horses
b) Darwin’s finches ✅
c) Archaeopteryx
d) Antibiotic resistance
Answer: b) Darwin’s finches
Explanation: They evolved different beaks to adapt to different food sources.
Q99. Which scientist proposed the theory of pangenesis?
a) Darwin ✅
b) Mendel
c) Lamarck
d) Morgan
Answer: a) Darwin
Explanation: Darwin’s pangenesis theory suggested “gemmules” carried traits (later disproved).
Q100. Which one of the following is the smallest unit of evolution?
a) Individual
b) Population ✅
c) Cell
d) Organism
Answer: b) Population
Explanation: Evolution acts on populations over generations, not on individuals.
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❓ FAQ Section
Q1. Why are Heredity and Evolution MCQs important for Class 10 students?
They help students practice key concepts of genetics and evolution, which are frequently asked in CBSE Class 10 Science board exams.
Q2. How many MCQs should I practice from this chapter for exam preparation?
About 80–100 MCQs with explanations are sufficient for strong preparation and revision before board exams.
Q3. What type of questions are asked from Heredity and Evolution in Class 10 Science exams?
Questions on Mendel’s experiments, traits, laws of inheritance, sex determination, evolution, homologous and analogous organs, and fossils are commonly asked.
Q4. Are these MCQs useful for competitive exams like NTSE or Olympiads?
Yes, these MCQs are not only useful for board exams but also for NTSE, Olympiads, and other school-level science competitions.
Q5. Can solving MCQs improve my final exam score?
Definitely. Practicing MCQs improves conceptual clarity, accuracy, and time management, which helps in scoring higher marks in CBSE Science exams.
