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SS1: BIOLOGY - 1ST TERM

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  1. Introduction to Biology | Week 1
    6 Topics
    |
    1 Quiz
  2. Recognizing Living Things | Week 2
    3 Topics
    |
    1 Quiz
  3. Organisation of Life | Week 3
    3 Topics
  4. Classification of Living Organisms | Week 4
    7 Topics
    |
    1 Quiz
  5. Kingdom Prokaryotae / Monera & Kingdom Protista | Week 5
    3 Topics
    |
    3 Quizzes
  6. Kingdom Fungi & Kingdom Plantae | Week 6
    9 Topics
    |
    2 Quizzes
  7. Kingdom Animalia I | Week 7
    6 Topics
    |
    1 Quiz
  8. Kingdom Animalia II | Week 8
    5 Topics
    |
    1 Quiz
  9. The Cell | Week 9
    3 Topics
    |
    1 Quiz
  10. The Cell Structure and Functions | Week 10
    4 Topics
    |
    1 Quiz
  11. The Cell and its Environment | Week 11
    4 Topics
    |
    1 Quiz
  12. Nutrition in Plants | Week 12
    4 Topics
    |
    1 Quiz



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Material required: Fresh green leaves from outdoor plants, beaker, burners, boiling tubes, dropping tube white tile, iodine solution.

Method:

Boil the leaf in water for about one minute. This kills the protoplasm and bursts the starch grains.

Remove the leaf and place it in a boiling tube containing about one–third full of 70% alcohol.

Place in a beaker of water. Warm gently, do not allow the water to boil. The purpose of this stage is to decolourize the leaf.

Dip the leaf in boiling water again to soften the leaf. Alcohol makes the cell wall brittle.

Finally, place the leaf on a white tile and drop a few drops of iodine.

test for starch e1659350222530
Procedure to test for starch.

A blue-black colour indicates the presence of starch.

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