In morphology: Embryology. The development of the seed plant is basically different from that of an animal. The egg cell of a seed plant is retained within the enlarged lower part, or ovary, of the seed-bearing organ (pistil) of a flower; two sperm nuclei pass through a structure called a pollen tubeâ¦ Read More; wheat grains
Spleen Pain Causes 1  : Swelling of spleen is called splenomegaly. It can be caused by liver diseases, infections and blood related problems and also irregularity in the lymph system.  Certain infections like mononucleosis (caused by virus), toxoplasmosis (caused by parasite) and endocarditis (caused by bacteria) may cause pain in the spleen.
Other causes of an enlarged spleen include: 1  Inflammatory diseases such as sarcoidosis and rheumatoid arthritis. 2  Trauma, such as an injury during contact sports. 3  Cancer that has spread (metastasized) to the spleen. 4  A cyst, a noncancerous fluid-filled sac.