Wednesday, 17 May 2017
Mycorrhizas are symbiotic relationships between fungi and plant roots (the term means literally 'fungus root') Perhaps more than 80% of the species of higher plants have these relationships, and so do many pteridophytes (ferns and their allies) and some mosses (especially liverworts). They are as common on crop plants (cereals,
Wednesday, 3 May 2017
In addition to water, carbon dioxide, mineral salts, and heat, light is one of the factors which are of vital importance for the green plant. It provides energy for the photosynthesis and brings about the growth and development of plant forms. In addition to the light on itself, also the light intensity plays an important role. The leaves of deciduous trees are the place where the energy required for the plant is formed by photosynthesis and assimilation. This is done in the chlorophyll-containing cells of the palisade layer. There below is loose fill and aerenchyma tissue. Outwardly a leaf is sealed off by a layer of epidermal cells, the outer walls thereof are thickened.
In fact, the light influences the construction of the plant and its leaves. We find sun leaves on the outer edge of the crown and on the south side of it, shade leaves