LIFE SCIENCE

Detailed explanation-1: -In green alga, chloroplasts are of various shapes and sizes but chloroplasts of higher plants are disc-shaped with a diameter of 4 to 6 micrometre and thickness of 2 to 4 micrometre. In embryophytes, they are the second-largest cell organelle, smaller only to the nucleus.

Detailed explanation-2: -In animal cell Mitochondria is second largest cellular organelle, but Chloroplast(Plastids) are much larger than Mitochondria. So in Plants, Chloroplast becomes second largest organelle and third largest organelles of plant cell is thus Mitochondria.

Detailed explanation-3: -Largest organelle in animal cell is mitochondria and chloroplast in plant cell.

Detailed explanation-4: -Nearly all living eukaryotic cells contain mitochondria, however their size (  0.5 to 3 µm), shape and number varies considerably, both between different cell types but also within the chondriome (the total mitochondria population of a cell)12, 13.