Chloroplast

Chloroplast is an organelle found in plant cells which allows plants to harvest energy from sunlight. This process is known as photosynthesis and occurs in special organelles called chlorophyll.

As shown in the figure above the Chloroplast is made up of stacks of thylakoids which contain the chlorophyll. These coin-like stacks are called granum and make it easier to store thylakoids and by extension, more chlorophyll.

When it comes to chloroplasts and different typer of cells, chloroplast can only be found in plant cells. As stated above, the chloroplast contains chlorophyll which is a green pigment. The reason plants are green are because the plant's cells contain enough chlorophyll to make it so.

In fact, chloroplasts bear a close resemblance to another organelle, the mitochondria. Both chloroplasts and mitochondria replicate by division, have their own genetic systems, create metabolic energy, and have several crucial jobs in creating ATP. media type="google" key="-8139187002927068738&hl=en&fs=true" width="400" height="326" Source: http://video.google.com/videoplay?docid=-8139187002927068738&hl=en

SOURCES:http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=cooper.section.1655 http://micro.magnet.fsu.edu/cells/chloroplasts/chloroplasts.html