plants have other nutritional requirements the story beyond photosynthesis
TRANSCRIPT
PLANTS HAVE OTHER NUTRITIONAL REQUIREMENTSTHE STORY BEYOND PHOTOSYNTHESIS
PLANTS HAVE OTHER NUTRITIONAL REQUIREMENTS
THE NEED FOR MACRONUTRIENTS
Photosynthesis provides Carbon, Hydrogen and Oxygen in the form of glucose C6H12O6
What other macronutrients are needed?
Write them in your exercise book & why we need them
What is the difference between macronutrients & micronutrients?
Give some examples of micronutrients
PLANTS HAVE OTHER NUTRITIONAL REQUIREMENTS
NITROGEN-FIXING BACTERIA
Nitrogen gas (N2) makes up 78% of the atmosphere however, this is not in a form that most organisms can use.
ENTER: Nitrogen-fixing bacteria!
PLANTS HAVE OTHER NUTRITIONAL REQUIREMENTS
WEATHERING OF ROCKS
Weathering of rocks involves the physical and chemical breakdown of rock particles that produces water-soluble mineral salts.
So what!
The pH of the soil affects the availability of these ions for uptake by plants.
These mineral salts are inorganic compounds that are absorbed as ions into the roots of plants.
What features of plants assist them in taking up mineral salts? Explain the processes involved.
PLANTS HAVE OTHER NUTRITIONAL REQUIREMENTS
MYCORRHIZAL ASSOCIATIONS
Symbiotic relationship between plant roots and mycorrhizal fungi. This relationship increases the effective root surface area for nutrient absorption.
The mycorrhizal fungi act as extended root hair substitutes.
HETEROTROPHIC STRATEGIESHeterotrophs must obtain organic compounds by eating other organisms or their products
HETEROTROPHIC STRATEGIES
Nutritional requirementsof heterotrophs
Carbohydrates & Lipids
Vitamins(organic)
Minerals(inorganic)
Amino Acids
9 EssentialAmino Acids
Glucose usedin cell respiration
Lipids required forcell membranes
Required for protein synthesis
Must be included in diet as heterotrophs cannot make
13 required
Used in enzymes
20 required
Structural components& in enzymes & vitamins
HETEROTROPHIC STRATEGIES
FOOD MUST BE DIGESTED (CLASS ACTIVITY)
Remember you should have your own set of notes from pages 111 to 114 from Heinemann Biology 1 Textbook.