Pyrenoids are

✅Explanation:
-Pyrenoids are sub-cellular micro-compartments found in the chloroplasts of many algae and hornworts. They are primarily associated with the carbon-concentrating mechanism (CCM) that enhances the efficiency of photosynthesis.
-Structurally, pyrenoids are composed of a central core of protein (mainly Rubisco, the key enzyme in carbon fixation) surrounded by a sheath of starch grains. The starch acts as a storage reserve of carbon dioxide, which can be readily utilized by Rubisco for photosynthesis.

🔑Key Points:
-Pyrenoids
-Pyrenoid is a protein-rich body found in the members of Chlorophyceae or green algae. It is used for the storage of reserved food material.
-It may be one to many in number in different species of algae.
-The chloroplast is a double membrane-bound cell organelle.
-Out of the two membranes, the inner membrane is relatively less permeable (the outer membrane contains porins)
-The number & shape of chloroplast also varies from one species of algae to another.

• 🛑Additional Information:
-Stomata ​
-Stomata are the tiny pores on the leaves which play a major role in the exchange of gases.
-The intake of carbon dioxide and the outtake of oxygen both takes place through these pores.
-The respiration in leaves takes place through these tiny pores.
-Evaporation of water from the leaf surface occurs through the stomata.
-Thus, the stomata help in the process of transpiration.
-It also closes or opens its pores based on climatic conditions to maintain the moisture balance.
-It remains open during the day and closed at night. This closure at night prevents water from escaping through open pores.
-Carotenoids
-arotenoids also called tetraterpenoids, are yellow, orange, and red organic pigments that are produced by plants and algae, as well as several bacteria and fungi.
-Carotenoids give the characteristic color to pumpkins, carrots, corn, tomatoes, canaries, flamingos, salmon, lobster, shrimp, and daffodils.
-Chlorophyll
-​Chlorophyll or leaf green is a porphyrin derivative with magnesium (Mg) as the central atom and is hence a metal complex dye.
-It is present in the chloroplasts in all green parts of plants as a mixture of blue-green chlorophyll a and yellow-green chlorophyll b and constitutes the catalyst for photosynthesis.
-Chlorophylls are porphyrins, whose molecules contain a flat ring of four-linked heterocyclic groups, based upon magnesium.
-Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria.