This question checks where pyrenoids sit among the algal groups and what job they do. A pyrenoid is a small proteinaceous body inside a chloroplast that collects the sugar made during photosynthesis and packs it away as starch.
- Food storage bodies in Rhodophyceae: Red algae store their reserve food as floridean starch scattered in the cytoplasm, not inside a pyrenoid, so this pairing is wrong.
- Food storage bodies in Chlorophyceae: Green algae are the classic group where pyrenoids sit inside the chloroplast and build up starch grains around themselves. This is the textbook pairing.
- Food storage bodies in Phaeophyceae: Brown algae keep their reserves as laminarin and mannitol, again without using pyrenoids for storage in the same way, so this option fails.
- Food storage bodies in Cyanophyceae: Blue green algae are prokaryotes and have no true chloroplast at all, so they cannot host a chloroplast bound pyrenoid.
Since a pyrenoid is by definition a chloroplast structure, and only green algae are described as commonly having chloroplast bound starch storing pyrenoids, Chlorophyceae is the right group.
Let's summarize:
- A pyrenoid sits inside a chloroplast and stores starch.
- Rhodophyceae and Phaeophyceae store food differently (floridean starch, laminarin and mannitol).
- Cyanophyceae lack chloroplasts entirely.
So the correct answer is food storage bodies in Chlorophyceae.