Question

From the following pairs determine the correctly described cellular parts.

• A. Thylakoids - Flattened membranous sacs forming the grana of chloroplasts
• B. Centrioles - Sites for active RNA synthesis
• C. Ribosomes - Those in chloroplasts are larger $\left(\right.80 \, s\left.\right)$ while those in the cytoplasm are smaller $\left(\right.70 \, s\left.\right)$
• D. Lysosomes - Optically active at a $pH$ of about $8.5$

Answer 1

Answer: (A)

Within the chloroplasts, there are stacks of disc shaped membranous structure called granum and individual disc is called thylakoid. This is a flattened structure which holds the chlorophyll within its lumen, thus, making the site for light reaction. Chloroplasts have $70 \, S$ ribosome within it. Centriole is for cell division in animal cell. Lysosomes are more active at lower pH