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Phototropism Lab report

Aim - To investigate the response of plants to light.

RQ - What impact does the light intensity have on the growth and movement of plants?

Hypothesis- In response to the light, the mustard seeds will grow towards the direction of the light.

Independent variables: The light intensity

Dependent variables: Growth response of plants

Controlled Variables: The plant type, amount of seeds

Method:

Take a cardboard box.

Divide the cardboard box into 3 sections.

In one section of the cardboard box, make a opening on the side for the light.

In the second section of the cardboard box, make a opening on the top for the light.

Leave the third section closed with no opening for light.

Take 3 petri dishes and place cotton wool in each of them.

Sprinkle mustard seeds on the petri dishes containing cotton wool.

Pour some water into each of the petri dishes.

Add a few more mustard seeds to each of the petri dishes.

Put one of the petri dish in the section of the cardboard box where there is light from the side.

Put the second petri dish in the section of the cardboard box where there is light from the top.

Put the last petri dish in the section of the cardboard box where there is no light at all.

Place the carboard box along near a window for about 1 - 2 weeks.

Make sure to check on the mustard seeds during these 1-2 weeks.

Remove the petri dishes from the cardboard box.

Observe the movement of growth of the shoots in each of the petri dishes.

Record your results in a table.

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Geotropism Lab report

Aim: To investigate the growth response of plants with gravity.

RQ : How does gravity affect the growth response of plants?

Hypothesis: Due to gravity, the stems will grow in the upward direction, the roots will grown in the downward direction.

Independent variables: Gravity

Dependant variable: Growth response of plants.

Controlled variable: Light , type of seed, amount of seeds

Method:

Take 5 corn seeds and soak them in water for 24 hours.

Take a petri dish and place those 5 corn seeds in different positions.

Take a filter paper and trace the shape of the petri dish.

Next cut out the traced circle.

Place the cut filter paper over your seeds in the petri dish. Push it around to the edges

Take 20-25 ml of water and pour over the filter paper in the petri dish.

Place cotton balls all over the filter paper in the petri dish. Press the cotton against the seeds.

Tape around the outside edge of the petri dish, keeping the front and the back side secured.

Place inside a cabinet door using tape for 1 week.

After a week, observe the growth of stems and the roots and record your results.

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