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Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution1 Mark
MCQ
According to Darwin, evolution is :
  • A
    A sudden but discontinuous process.
  • ✓
    A slow, gradual and continuous process.
  • C
    A sudden but continuous process.
  • D
    A slow and discontinuous process.
✓

Answer

Correct option: B.
A slow, gradual and continuous process.
Darwin believed that certain variations are better adapted to environmental conditions.
These adaptations got accumulated over a period of time in each generation, and ultimately gave rise to new species.
Thus, time was the most important requirement in speciation.
Further evolution is a continuous process in the sense that intermediate forms between ancestors and present-day modern species did exist in past but later on got extinct.

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