• leaf
  • There are about 450000 to 800000 chloroplasts for every square millimeter of a leaf. (hubpages.com)
  • The colour of the leaf changes according to the ratio of these two substances ( pigments) very young leaves have red coloured pigment called anthocinin, thus, they look red. (hubpages.com)
  • type
  • One type, called phytochromes, are sensitive to red and far-red light and play a major role in the making of chloroplasts and the growth of the stem, said Chen, who is the first author on the study. (phys.org)