Why some fruits retain their flavor(sour) even if they ripen?

Question

pls answer..ASAP...ty

Answer 1

Taste is how we evaluate the quality of the food we eat.  Sour & bitter is linked to food going off and toxins in plants so taste there would have been a survival factor for those who spit out unpleasant tasting food that was poisonous.  Sweet is from the food value so we seek it. Fruit that has no sourness left is likely to be going off soon so sweet with sour registers as fresh and is linked with 'good to eat' in fruit but not in meat. Sour meat has gone bad. When we sample fruit we are looking for sweet, because that means there is food value, with no bitter quality because most poisonous berries are bitter. Sour is how fruit should be until ripe when the starch is fully converted to sweet tasting sugar to attract a fruit eater for seed dispersal. Some sourness is retained to continue preservation of the very sugar rich pulp because if bacteria or insects eat it they will not disperse the seeds for the plant. Over time the fruit eaters and the plant came to a balance in enough sourness to prevent disease but not so much the fruit eater was discouraged. Bacteria are very sensitive to low pH.

http://www.discoverychannel.co.uk/scienc...

Different regions offer different food sources so the genes have variations (alleles) that detect with different degrees of sensitivity. People with a very high sensitivity to sour taste may have come from a population with a food, when slightly sour, was not healthy so evolved to avoid it. So to them a fruit is sour while to another person with different alleles the fruit is sweet and 'fresh' tasting.

The degree we taste sourness is genetically varied. Some people inherit a gene to detect sour at lower levels while some require more acidity before it is determined to be sour. Only one sour taste receptor has been identified but more are likely to be found.

http://www.sciencedaily.com/releases/200...

http://www3.interscience.wiley.com/journ...

http://www.rsc.org/chemistryworld/News/2...

Answer 2

fruits countain falvour caus if it doesn't have a falvour we can't taste nothing and we can make alot of things with friuts cause they have taste