Among apples, cherries, oranges, and watermelons, a serving of which fruit would raise the level of sugar in blood by the least amount?

I'm not 100% sure but I would say watermelon. Watermelon is predominantly water like most melons. 

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.