Question

Pyrenoids are made up of

• A. Core of starch surrounded by sheath of protein.
• B. Core of protein surrounded by fatty sheath.
• C. Proteinaceous centre and starchy sheath.
• D. Core of nucleic acid surrounded by protein sheath.

Answer 1

Answer: (C)

Proteinaceous centre and starchy sheath.

Pyrenoids are the subcellular micro-compartments or simply the dense bodies present inside the chloroplasts of certain algae and other plants. Pyrenoids are associated with the storage of starch as layers of starch are found to be present around them.

They consist of a central granular core which is proteinaceous and this core is surrounded by starch plates or starch cells. Pyrenoids are also associated with the carbon concentrating mechanism.

So, the correct answer is C.