Plant Tropisms

What is phototropism?

• The process of converting light energy into mechanical energy.

• The process of converting light energy into heat energy.

• The growth or movement of an organism in response to light.

• The process of converting light energy into chemical energy.

Which plant hormone is responsible for phototropism?

• cytokinin

• auxin

• gibberellin

• ethylene

What is thigmotropism?

• Phototropism

• Geotropism

• Hydrotropism

• Thigmotropism

Which of the following is an example of thigmotropism?

• Growth of roots towards water

• Curling of leaves towards sunlight

• Curling of tendrils around a support structure

• Opening of flowers in response to light

What is hydrotropism?

• The growth or movement of a plant in response to gravity.

• The growth or movement of a plant in response to water or moisture.

• The growth or movement of a plant in response to temperature.

• The growth or movement of a plant in response to light.

Which of the following is an example of hydrotropism?

• Plant roots growing towards a water source

• Plant roots growing towards a heat source

• Plant roots growing towards sunlight

• Plant roots growing away from a water source

What is gravitropism?

• The process of plants converting sunlight into energy.

• The process of plants releasing oxygen into the atmosphere.

• The process of plants absorbing water from the soil.

• The growth or movement of a plant in response to gravity.

Which plant part shows positive gravitropism?

• root

• flower

• leaf

• stem

What is the main stimulus for phototropism?

• light

• water

• temperature

• gravity

What is the main stimulus for thigmotropism?

• mechanical stimulation or touch

• light

• gravity

• temperature