Life Cycle - Plants (4B)
Lab 

PROBLEM: Why is starch important to plants?

PREDICTION:

MATERIALS: dilute iodine, medicine droppers, small containers

PROCEDURE: Iodine can test for starch. Crush all the solid substances and place all liquid substances into containers before applying iodine. Place one or two drops of iodine on the items below, record what happens. In the space below, enter + or - to indicate whether it gave a positive or negative starch test result.

ITEM

RESULT

ITEM

RESULT

bread

  

water

  

potato

  

bean

  
candy   orange juice  

banana

  

butter

  

apple

  

oil

  

cracker

  

leaves

  

meat

  

paper

  
potato chip   plastic  

lettuce

  

onion

   

Iodine is used as an indicator for the presence of starch. It is a dark orange liquid but when applied to something that contains starch, it turns what color?

CONCLUSIONS: How is starch produced by a plant?

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