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3 constute 60 of nal course grade

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Unformatted text preview: CAL/FAMILY BEREAVEMENT EMERGENCIES ARE ACCEPTABLE EXCUSES FOR MISSING EXAM –  no other excuses accepted –  Prac<ce ques<on set posted –  see BB for TA review session <mes determinate vs. indeterminate growth •  growth des<ned to form a terminal structure (e.g. leaf, flower) = determinate –  programmed, ends with differen<a<on into non- dividing cell types •  indeterminate –  in meristems –  undifferen<ated cells persist while new roots and shoots grow •  contain poten<al to develop into all root and shoot structures Indeterminate growth Box Huckleberry in PA covers 10 sq mi and may be over 13,000 years old secondary growth •  is a dicot characteris<c –  depends on func<on of vascular cambium and cork cambium, which are not present in monocots –  cork surrounds stems and roots •  waterproofing •  few monocots have thickened stems –  e.g. palms –  use a different mechanism for this growth rings of annual growth are most prominent in temperate trees pith: spongy perenchyma cells func<on in storage leaf anatomy Leaf Cross Sec<on Plant nutri<on •  Common nutrients (easy for plants to obtain) –  Carbon –  Hydrogen –  Oxygen •  More precious nutrients (obtained) from "soil solu<on" as ions –  Sulfur –  Phosphorous –  Magnesium (needed in Chlorophyll) –  Iron (needed in cytochromes) Plants are... •  photoautotrophs –  but some plants rely on bacterial chemolithotrophs to provide nitrogen and sulfur •  sessile –  unlike sessile animals, which use moving water to bring food to them, most plants need to use growth as their movement •  microenvironments very important –  defined by availability of nutrients and light –  some good, some bad, preven<ng survival/growth macro- and micronutrients •  Macronutrients - needed in concentra<ons of >1 g /kg dry weight •  Micronutrients - needed in < 100 mg / kg dry weight •  (aside: what is dry weight and how do you measure it?) How to tell if a plant is deficient in a mineral nutrient? •  N deficiency = most common •  N is almost always limi<ng for plants growing in nature •  N is needed for chlorophyll; N deficient plants are deficient in chlorophyll pigment; yellow (carotenoid pigments) is seen (normally masked...
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