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.
Since mononucleosis can cause the spleen to swell, it may in rare cases lead to a ruptured spleen. Rupture may occur without trauma, but impact to the spleen is usually a factor. Mono may resemble strep throat or other bacterial or viral respiratory infections.