The stem of a plant must elevate the flowers, fruits and leaves of the plant so that the plant can receive enough sunlight to undergo photosynthesis. The cells in the stem of a plant often have thicker cell walls than the other parts of the plant in order to A. Allow more light to penetrate through the stem B. Secrete water and oxygen through the stem C. Provide support and strength to the stem D. Increase gas exchange in the stem

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.