Which type of haploid unicellular enicaryote cells has a diameter of-10 µm, and about half of their volume la occupied by cup-shaped chloroplasts?
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Correct answer: C
Explanation
The correct answer is option 3 i.e. Chlamydomonas.
The haploid unicellular eukaryotic cells described are Chlamydomonas. These are green algae that belong to the phylum Chlorophyta. Chlamydomonas cells are typically about 10 µm in diameter and possess a distinct cup-shaped chloroplast, which occupies nearly half of the cell’s volume. This chloroplast contains chlorophyll for photosynthesis and often has a central pyrenoid involved in carbon fixation. The cells are motile due to two anterior flagella and have a single nucleus, contractile vacuoles, and an eyespot that helps in detecting light. Chlamydomonas reproduces both sexually and asexually and is commonly found in freshwater environments. Its simple structure makes it an important model organism in studies of photosynthesis, cell motility, and genetics.