Membrane bound organelles are absent in(a) Streptococcus(b) Chlamydomonas(c) Plasmodium(d) Saccharomyces

To determine which of the listed organisms lacks membrane-bound organelles, we need to consider the characteristics of each organism:

(a) Streptococcus: This is a genus of bacteria. Bacteria are prokaryotic organisms, which means they do not have membrane-bound organelles. Their cellular structure is simpler, lacking compartments surrounded by membranes.

(b) Chlamydomonas: This is a genus of unicellular green algae. Chlamydomonas is a eukaryotic organism, meaning it does possess membrane-bound organelles, such as a nucleus, chloroplasts, and mitochondria.

(c) Plasmodium: This is a genus of parasitic protozoa, which includes species that cause malaria in humans. Plasmodium is also a eukaryotic organism and has membrane-bound organelles.

(d) Saccharomyces: This is a genus of yeasts, which are also eukaryotic organisms. Saccharomyces species, such as Saccharomyces cerevisiae (baker's yeast), contain membrane-bound organelles.

Based on this information, the answer to the question is:

Membrane-bound organelles are absent in (a) Streptococcus.