EVERYDAY SCIENCE

Detailed explanation-1: -Chloroplasts contain a system of membrane sacs, the thylakoids, some of which are stacked to form grana (singular, granum), whereas others float freely in the stroma. It is on the thylakoid membranes that the electron carriers necessary for photosynthesis reside.

Detailed explanation-2: -tight stacks called grana (singular granum). Grana are connected by stromal lamellae, extensions that run from one granum, through the stroma, into a neighbouring granum.

Detailed explanation-3: -In most higher plants, the thylakoids are arranged in tight stacks called grana (singular granum).

Detailed explanation-4: -So, the correct answer is ‘When stacked, each thylakoid is able to increase their total surface area which allows more electron transport chains to be embedded into each thylakoid membrane’

Detailed explanation-5: -Grana is the plural form of granum, which is the single form. The stroma lamellae connect two grana. Chloroplasts are made up of grana and stroma lamellae. The photosynthetic light reaction takes place in grana.