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.
Stomata and the Lower Epidermis. Remember that the top of the leaf has the protective coating of the cuticle and then a layer of cells known as the upper epidermis. On the bottom of the leaf is another protective layer of cells.Because it is at the bottom of the leaf, this layer is known as the lower epidermis.he Structure of Leaves. Leaves are vital to the survival of plants. They help plants in a variety of ways, including producing food and oxygen through photosynthesis, balancing water loss, regulating gas exchange and transporting the products of photosynthesis.