Cylindrical cell lying immediately beneath the upper epidermis of a leaf. Palisade cells normally exist as one closely packed row and contain many chloroplasts. During the hours of daylight palisade cells are photosynthetic, using the energy of the sun to create carbohydrates from water and carbon dioxide.
Blue symbolizes hope, the clear sky, and the streams of the south. Yellow stands for the sun and the Sahara Desert. Red represents unity, prosperity, and national sacrifice. Effective date: 6 November 1959.