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Assertion (A): A large organism is built from many small cells rather than from a few large ones.
Reason (R): Cells cannot exceed a certain size without starving their own interiors.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the reason gives the constraint that forces the arrangement: since exchange is limited by surface area, growth is achieved by adding cells rather than by enlarging them, which brings specialisation as a further benefit.

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