social order (social orders plural) The social order in a place is the way that society is organized there. n-var. ...the threat to social order posed by right-wing extremists. social science (social sciences plural). 1 n-uncount Social science is the scientific study of society. 2 n-count The social sciences are the various types of social science, for example sociology and politics. usu pl. social scientist (social scientists plural) A social scientist is a person who studies or teaches social science.
They have to be let in through special doors called stomata. Stomata can be on both sides of the leaf, but are usually concentrated on the bottom of the leaf to limit water loss due to evaporation. If you collect leaves from many different plants, youâll notice that they donât all look the same.
9.1.3 Explain the relationship between the distribution of tissues in the leaf and the functions of these tissues. Upper epidermis-Consists of a single layer of cells found on the upper surface of the leaf. It is covered by a thick waxy cuticle.The main function of the upper epidermis is water conservation.It prevents the loss of water from the upper surface where the light intensity and heat are the greatest.pongy mesophyll-Made up of loosely packed cells. This tissue is found in the lower half of the leaf (lower surface) and has few chloroplasts. It provides gas exchange (CO 2 uptake and O 2 release) and therefore needs to be close to the stomata found in the lower epidermis.