Реферат: Finding About Photosynthes Essay Research Paper

Finding About Photosynthes Essay, Research Paper

Finding out about photosynthesis

Date: __________

Partners: ____________

Aim: To be able to explain the conditions necessary for photosynthesis and to compare experimental results to a control. To recognise tests for some inorganic substances found in plants.

Materials:

h A plant with variegated leaves in a pot which has been in the dark for 24 hours prior to the class

h Iodine

h Alcohol

h Potassium hydroxide

h Hotplate (or Bunsen burner with tripod)

h Petri dish

h Funnel

h 2 flasks (500ml)

h 2 beakers

h Aluminium foil

h Forceps

h Retort stands and clamps

h Cottonwool

h Grolux light or other light source.

Method:

Day 1

The plant you will use has been left in the dark for 24 hours prior to the class.

1. Take one leaf of the plant and test it for the presence of starch as follows:

(a) Place the leaf in a small beaker of alcohol.

(b) Place the beaker in a water bath.

(c) Bring the water in the water bath to the boil.

(d) Leave until the alcohol in the beaker containing the leaf boils.

(e) Using forceps remove the leaf carefully form the alcohol.

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