Tagged: Pollen grains

The structure of typical flowers

The Living Organisms

April 13, 2015

What is the structure of the typical flower?

The flower The flower is a short stem whose leaves are modified to form different parts of the flower, It is the organ of sexual reproduction in the flowering plants, It arises from a...

The sperm

The Living Organisms

March 4, 2015

The structure of the sperm in the male reproductive system

The sperms The testes of the adult human male produce about 2 billion sperms per day , the lifetime of a single sperm inside the female vagina ranges from 2 to 6 hours, this...