it is green when immature , reaching yellow or red when ripe . its shape is elongated and may, however, vary greatly in form depending on the crop varieties . this variation also occurs with the pulp , which can be hard or soft , medium or hard to scale , as well as sweeter or more sour taste . bunches of bananas, pending the end of the false stem of the banana may have 5-20 bunches and can weigh 30 to 50 kg. each banana weighs an average of 125g , having a composition of 75 % water and 25 % dry matter . bananas are substantial source of vitamin a, vitamin c, fiber and potassium.