Plant Responses OL - LC Biology

Plants react to things in their environment. Select some of the external stimuli they react to. Select 3.

• Light

• Chemicals

• Touch

• Sound

• Air flow

The reaction of a plant to an external stimulus is called a tropism. What is the name given to the tropism in the picture?

• Phototropism

• Geotropism

• Hydrotropism

• Chemotropism

• Thigmotropism

The reaction of a plant to an external stimulus is called a tropism. What is the name given to the tropism in the picture?

• Phototropism

• Geotropism

• Hydrotropism

• Chemotropism

• Thigmotropism

The reaction of a plant to an external stimulus is called a tropism. What is the name given to the tropism in the picture?

• Phototropism

• Geotropism

• Hydrotropism

• Chemotropism

• Thigmotropism

Tropisms can either be positive or negative responses. Positive grows with the factor negative grows away. Which part of the plant is positively geotropic?

• Root

• Stem

• Leaves

• Flowers

These responses to their environment are controlled by growth regulators. Where in the plant are these regulators produced?

• Meristematic tissue

• Vascular tissue

• Stems

• Flowers

Growth regulators are similar to human hormones. Select some of the things that are similar below. Select 3

• Produced in one place but work in another

• They are very fast acting

• Their affects are long lasting

• They are transported in the vascular tissue

• Produced in the same tissue

Growth regulators can be either promoters or inhibitors. Select the growth promoters from the list below. Select 2

• IAA

• Auxins

• Ethene

• Abscisic Acid

Growth regulators can be either promoters or inhibitors. Select the growth inhibitors from the list below. Select 2

• IAA

• Auxins

• Ethene

• Abscisic Acid

Growth regulators can be used to help food production and horticulture. Select 3 positive uses shown below.

• Seedless Fruit

• Ripening fruit after transport

• Tissue culture - to grow plants

• Produce smaller fruits

• Make the fruit fall from the trees.