Question

The stroma contains a number of _____ made up of disc-like ______

(a) grana, thylakoids

(b) grana, stroma

(c) thylakoids, grana

(d) stroma, grana

This question was addressed to me in a national level competition.

My doubt stems from Sites of Photosynthesis in a Plant Cells in division Photosynthesis in Higher Plants of Biology – Class 11

Answer 1

Right choice is (a) grana, thylakoids

To explain: The stroma actually contains a number of grana made up of disc-like thylakoids. Grana and thylakoids are the main sites of light reaction. A stack of thylakoid discs together forms a granum (plural of grana). Grana ranges from 10 to almost 100 in number.