Ch. 37 Warm-Up

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Ch. 37 Warm-Up

• What conclusions should we draw from van
  Helmonts experiment?
• Where would you expect a deficiency of a
  relatively immobile element to be seen first in a
  plant? (pg. 756)
• What are the possible consequences of selling off
  water rights to cities and developments?

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Chapter 37

• Plant Nutrition

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What you need to know

• Mutualistic relationships between plant roots and
  the bacteria and fungi that grow in the
  rhizosphere help plants acquire important
  nutrients.
• Nonmutualistic nutritional adaptations enable
  plant survival in adverse habitats.

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Nutritional Requirements

• Essential element required for plant to complete
  life cycle and produce another generation
• Macronutrients (large amounts) CHNOPS K, Ca,
  Mg
• Nitrogen most important!
• Micronutrients (small amounts) Fe, Mn, Zn, Cu,
  etc.

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Soil Quality

• Texture topsoil w/ humus (decayed organic
  material) prevents packing of clay ? porous
  (retain H2O) yet aeration of roots
• Chemical composition
• cation exchange roots add H to soil to replace
  cations (K, Ca2, Mg2) absorbed by plant

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Unusual nutritional adaptations epiphytes,
parasitic plants, canivorous plants
Epiphyte grow on another plant, absorb H2O from
rain through leaves
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Parasitic Plants not photosynthetic absorb
sugar and minerals from living hosts
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Carnivorous Plants photosynthetic, but obtain
some nitrogen and minerals by digesting small
animals