Evolution

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Evolution explains the origin of life and the gradual changes in organisms over time that lead to the diversity of life on Earth. This category focuses on the principles, evidences, and mechanisms of evolution, making it suitable for school students (Classes 10–12), NEET aspirants, and undergraduate learners.

In this section, you will study:

  • Origin of life and early theories

  • Evidences of evolution from fossils, comparative anatomy, embryology, and molecular biology

  • Darwin’s theory of natural selection

  • Modern synthetic theory of evolution

  • Variation, adaptation, and speciation

  • Human evolution

  • NCERT-based explanations, diagrams, MCQs, and exam-oriented questions

The content is designed to build conceptual clarity, strengthen theory-based answers, and help students perform confidently in school exams, NEET, and undergraduate assessments.

Understand evolution as a unifying concept of Biology that explains both the history and continuity of life.

Q. What is adaptive radiation in the context of plant evolution?
  • A. The process of plants adapting to a single environment
  • B. The diversification of a group of organisms into forms filling different ecological niches
  • C. The extinction of plant species due to environmental changes
  • D. The gradual change of plant species over time
Q. What is the primary advantage of seed dispersal in plant evolution?
  • A. Increased competition
  • B. Reduced genetic diversity
  • C. Colonization of new habitats
  • D. Decreased survival rates
Q. What is the primary driver of adaptive evolution in plants?
  • A. Genetic drift
  • B. Natural selection
  • C. Gene flow
  • D. Mutation
Q. What is the primary factor driving the evolution of plant morphology?
  • A. Climate change
  • B. Soil composition
  • C. Pollinator preferences
  • D. Competition for light
Q. What is the primary factor driving the evolution of plant traits?
  • A. Climate change
  • B. Human intervention
  • C. Environmental pressures
  • D. Soil composition
Q. What is the primary mechanism by which evolution occurs in plant species?
  • A. Natural selection
  • B. Genetic drift
  • C. Mutation
  • D. Gene flow
Q. What is the primary mechanism by which evolution occurs in plants?
  • A. Natural selection
  • B. Genetic drift
  • C. Mutation
  • D. Gene flow
Q. What is the primary mechanism by which plants adapt to their environment over generations?
  • A. Photosynthesis
  • B. Natural selection
  • C. Transpiration
  • D. Pollination
Q. What is the primary role of mycorrhizal fungi in plant evolution?
  • A. Photosynthesis enhancement
  • B. Nutrient absorption
  • C. Seed dispersal
  • D. Pollination
Q. What is the role of mutations in plant evolution?
  • A. They are harmful and should be avoided
  • B. They provide raw material for evolution
  • C. They have no role in evolution
  • D. They only occur in animals
Q. What is the role of pollinators in the evolution of flowering plants?
  • A. They reduce genetic diversity
  • B. They facilitate cross-pollination
  • C. They increase competition
  • D. They have no role
Q. What is the role of the stomata in plant evolution?
  • A. Gas exchange
  • B. Water retention
  • C. Nutrient absorption
  • D. Photosynthesis
Q. What is the significance of genetic variation in plant evolution?
  • A. It decreases adaptability
  • B. It increases susceptibility to diseases
  • C. It enhances survival and adaptability
  • D. It has no impact on evolution
Q. What is the significance of the Cambrian explosion in plant evolution?
  • A. It marked the first appearance of land plants.
  • B. It led to the dominance of gymnosperms.
  • C. It resulted in the extinction of many plant species.
  • D. It was a period of rapid diversification of life forms.
Q. What is the significance of the fossil record in understanding plant evolution?
  • A. It shows current plant diversity
  • B. It provides evidence of past plant forms and their adaptations
  • C. It predicts future plant evolution
  • D. It eliminates the need for genetic studies
Q. What is the term for the evolutionary process where a single ancestral species diversifies into multiple forms to adapt to different environments?
  • A. Convergent evolution
  • B. Divergent evolution
  • C. Extinction
  • D. Speciation
Q. What role do environmental changes play in plant evolution?
  • A. They have no role
  • B. They can trigger mass extinction
  • C. They can lead to adaptive radiation
  • D. They only affect animal species
Q. What role do mutations play in plant evolution?
  • A. They are harmful and should be eliminated
  • B. They provide raw material for genetic variation
  • C. They have no effect on evolution
  • D. They only occur in animals
Q. What role do pollinators play in the evolution of flowering plants?
  • A. They increase genetic diversity
  • B. They decrease competition
  • C. They promote asexual reproduction
  • D. They limit species distribution
Q. What term describes the evolutionary process where two or more species influence each other's evolution?
  • A. Co-evolution
  • B. Convergent evolution
  • C. Divergent evolution
  • D. Adaptive radiation
Q. What term describes the evolutionary process where unrelated species evolve similar traits due to similar environmental pressures?
  • A. Convergent evolution
  • B. Divergent evolution
  • C. Adaptive radiation
  • D. Co-evolution
Q. What term describes the evolutionary process where unrelated species evolve similar traits?
  • A. Convergent evolution
  • B. Divergent evolution
  • C. Adaptive radiation
  • D. Co-evolution
Q. What term describes the evolutionary relationship between different plant species?
  • A. Phylogeny
  • B. Morphology
  • C. Taxonomy
  • D. Ecology
Q. What term describes the process by which two species evolve in response to each other?
  • A. Convergent evolution
  • B. Divergent evolution
  • C. Co-evolution
  • D. Adaptive radiation
Q. Which evolutionary concept explains the adaptation of plants to their environment over time?
  • A. Survival of the fittest
  • B. Adaptive radiation
  • C. Niche differentiation
  • D. Phenotypic plasticity
Q. Which evolutionary concept explains the development of new species from a common ancestor due to geographic isolation?
  • A. Allopatric speciation
  • B. Sympatric speciation
  • C. Parapatric speciation
  • D. Adaptive radiation
Q. Which evolutionary concept explains the development of new species from a common ancestor?
  • A. Speciation
  • B. Extinction
  • C. Adaptation
  • D. Migration
Q. Which evolutionary concept explains the development of similar traits in unrelated plant species due to similar environmental pressures?
  • A. Convergent evolution
  • B. Divergent evolution
  • C. Co-evolution
  • D. Parallel evolution
Q. Which evolutionary concept explains the emergence of new plant species from a common ancestor?
  • A. Speciation
  • B. Extinction
  • C. Hybridization
  • D. Gene flow
Q. Which evolutionary concept explains the similarities between unrelated plant species due to adaptation to similar environments?
  • A. Convergent evolution
  • B. Divergent evolution
  • C. Parallel evolution
  • D. Co-evolution
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