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Which of the following statements about eukaryotic cells is/are not true ?

(i) They can be both unicellular and multicellular.
(ii) They have a well organized nucleus.
(iii) Blue-green algae are eukaryotic cells.
(iv) They do not have nuclear membrane.

  • A.(i) and (ii)
  • B.(ii) and (iii)
  • C.(iii) and (iv)
  • D.Only (iv)

Answer: C

The statements that are not true are (iii) and (iv).

Blue-green algae (cyanobacteria) are prokaryotes: their cells have no membrane-bound nucleus, so (iii) is false. Eukaryotic cells are defined by a nucleus enclosed in a nuclear membrane, so (iv), which says they lack one, is also false.

Statements (i) and (ii) are true: eukaryotes include unicellular organisms such as Amoeba and yeast as well as multicellular plants and animals, and they have a well-organised nucleus. So options containing (i) or (ii), and 'Only (iv)', are wrong.

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