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a
Definite nucleus but no plastid
b
Definite plastid but no definite nucleus
c
Definite nucleus and plastid
d
Neither definite nucleus nor definite plastid
answer is D.
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Detailed Solution
Cyanobacteria or blue green algae are prokaryotes and hence do not have definite nucleus (but have nucleoid) and plastids (but have chromatophores). Membrane bound organelles are absent in prokaryotes.