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Lecture 72

BIOL 1010 Lecture 72: Lecture 72

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

OS82 Bio 1010 Micronutrients function in plants mainly as cofactors, Iron: Is a component of cytochromes, proteins in the electron transport chains of chloroplasts and mitochondria. Micronutrients can generally be recycled repeatedly, so plants need very little quantities of these elements from the soil. Yet a deficiency from a micronutrient can weaken or kill the plant. Molybdenum: There is only one atom of this rare element for every 60 million atoms of hydrogen in dried plant material. 23.8: The Soil Fertile soil supports plant growth. It can support abundant plant growth by providing conditions that enable plant roots to absorb water and dissolved nutrients. Three distinct soil layers. The A horizon, or topsoil is subject to extensive weathering (freezing, drying and erosion). Topsoil is a mixture of rock particles of various sizes, living organisms and humus, the remains of partially decayed organic material produced by the decomposition of dead organisms and fungi. The rocks provide a large surface area where it retains water and minerals while also forming water spaced containing oxygen for the roots. Topsoil is rich in organic materials and is therefore most important for plant growth. The soils B horizon, contains fewer organisms and much less organic matter than topsoil and is less subject to weathering. Fine clay particles and nutrients dissolved in soil water drain down from the topsoil and often accumulate in B horizon. The C horizon is composed mainly of partially broken-down rock that serves as the “parent” material for the upper layers of soil.
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