Sensitivity in Plants Chapter 15.

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Presentation transcript:

Sensitivity in Plants Chapter 15

Tropisms A tropism is the response of a plant to a stimulus There are different types of Tropisms Phototropism Geotropism Hydrotropism

Phototropism Phototropism is the response of a plant to light. The stem grows towards the light to allow more photosynthesis to take place.

To show phototropism in plants 1. Set up apparatus as shown in diagram 2. Leave in a bright warm place for a few days Results In A the cress seeds bend towards the light In B the cress seeds grow straight upwards In C the cress seeds will have poorly formed yellow leaves

Geotropism Geotropism is the response of a plant to gravity This ensures that the roots grow down into the soil for anchorage, water and minerals.

Geotropism

To show Geotropism in Plants 1.Set up apparatus as shown in diagram 2.Turn the bean seeds in different directions. Result No matter which way the bean seed is turned, the radicle(root) will grow downwards and the plumule(shoot) will grow upwards