Thread: Everyday Science Paper 2012
View Single Post
  #19  
Old Thursday, March 01, 2012
candidguy candidguy is offline
42nd CTP (PG)
CSP Medal: Awarded to those Members of the forum who are serving CSP Officers - Issue reason: CE 2013 - Merit 208
  
Join Date: Mar 2011
Posts: 504
Thanks: 1,946
Thanked 686 Times in 356 Posts
candidguy is a splendid one to beholdcandidguy is a splendid one to beholdcandidguy is a splendid one to beholdcandidguy is a splendid one to beholdcandidguy is a splendid one to beholdcandidguy is a splendid one to beholdcandidguy is a splendid one to behold
Default
Quote:
Originally Posted by mano g View Post
chloroplast is the unique cell organelle found in plant cell only, it is absent in animal cell, now chlorophyll is a pigment inside chloroplast that is used by the plants in the process of photosynthesis, It is only formed in the presence of sunlight.

so, chlorophyll is a pigment in chloroplast of plant cell, it is not a ''cell''.
Exactly.

Sis, Sadia, I know where you're coming from. You're right in saying Mitochondria and chloroplast(a variant of plastids, otheres being chromoplast and leaucoplast etc) have their own genomes. But they still can't be called as cells. Why? Cell is defined as 'The structural and functional unit of life'. What that means is, a cell has all the basic structure and performs all the functions a living thing can perform. These functions include, Growth, digestion, reproduction, response to stimuli, homeostatisis etc etc. A chloroplast though may have DNA, it lacks other above mentioned properties. As to chloroplast, it's a different thing altogether. It's just a pigment, that is formed inside CHLOROPLASTS in the presence of sunlight, necessary for photosynthesis.
Reply With Quote
The Following 5 Users Say Thank You to candidguy For This Useful Post:
azmatullah (Friday, March 02, 2012), mano g (Thursday, March 01, 2012), SADIA SHAFIQ (Thursday, March 01, 2012), seemasheikh (Thursday, April 26, 2012), Syed Imran Ali (Friday, July 06, 2012)