Salam Hujung MInggu..!!

Kita jumpa lagi.. disini cgu berikan  tambahan nota mengenai PEKA yang kita buat...so jangan lupa untuk melihat hasil eksperimen yang you all jalankan hari isnin nie..Harap2 pokok tu tak mati..maklumlah sekarang nie musim panas yang amat sangat...!! Berdoa je lah ye..!!

Ok..lets begin..!

Experiment

Shoe Box Potato Maze
This experiment requires a sturdy shoe box with a tight fitting lid.
You will also need a sprouting potato planted in a tea cup. Use toothpicks to hold the potato approximately one centimetre above the bottom of the tea cup and add water.
Try not to spill or splash water in the shoe box since water will eventually cause the cardboard to disintegrate.


Installing the light baffles
Open the box and install three light baffles as shown in the diagram to the left.
It is essential that these baffles be absolutely light-tight along all edges and against the lid when it is fitted. If the baffles are glued in place their edges should be light-sealed with a couple of layers of black duct tape.
Finally, cut a circular hole in the end of the box to admit light into the interior.



Installing the cover
It is important to prevent light from leaking over the top of the baffles where they come in contact with the lid. Two methods have proved useful.

1. Cut a thin sheet of foam padding to fit exactly inside the lid.
2. Cut three or four thickness of heavy felt to fit exactly inside the lid.

Carefully install the lid and gently weight it down so that it compresses the padding against the baffles and edges of the box.





Running the experiment
If the box is properly assembled, the only opportunity for light to enter the box is through the hole in the end of the box. Covering the box (leaving the hole exposed) with a black cloth provides additional protection from the effects of unwanted light entering the box.

Observations

This response is known as a phototropic response. The effect is called phototropism .

Explanation

The green leaves of some plants are very sensitive to light. These plants have evolved to spontaneously grow towards a source of light.