Biology · CELL THE UNIT OF LIFE

In the sectional view of the chloroplast shown below (Figure 8.8), identify the structure and arrangement represented by 'Granum' and 'Stroma lamella':

1. Granum is a single unfolded spherical vesicle; stroma lamella represents circular double-stranded DNA.
2. Granum represents the non-membranous 70S ribosomes; stroma lamella represents the semipermeable outer membrane.
3. Granum consists of thylakoids arranged in stacks like piles of coins, and stroma lamellae are flat membranous tubules connecting the thylakoids of different grana.
4. Granum contains starch grains stored in elaioplasts; stroma lamellae represent contractile proteins causing organelle fission.