Tropism, Taxis and Nastism

What is the difference between tropism and taxis?

• Tropism is the growth or movement of an organism in response to a stimulus, while taxis is the movement of an organism toward or away from a stimulus.

• Tropism is only found in plants, while taxis is only found in animals.

• Tropism and taxis are the same thing.

• Tropism is the movement of an organism toward or away from a stimulus, while taxis is the growth of an organism in response to a stimulus.

Explain how phototropism works in plants.

• Phototropism in plants is the response to gravity by growing upwards.

• Plants respond to light by growing away from it, a process known as phototropism.

• Plants respond to light by growing towards it, a process known as phototropism.

• Phototropism is the process of plants growing in response to touch.

Give an example of a positive and negative tropism in plants.

• Positive tropism: Plant growing towards darkness. Negative tropism: Plant growing towards water.

• Positive tropism: Plant growing away from sunlight. Negative tropism: Plant growing towards a toxic substance.

• Positive tropism: Plant growing towards gravity. Negative tropism: Plant growing towards nutrients.

• Positive tropism: Plant growing towards sunlight. Negative tropism: Plant growing away from a toxic substance.

How do cells respond to a stimulus in positive phototaxis?

• Moving randomly in all directions

• Moving away from the source of light

• No response to the stimulus

• Moving towards the source of light

What is the role of auxin in plant tropism?

• Inhibits cell elongation on the shaded side of the stem

• Causes wilting of the plant

• Promotes cell elongation on the shaded side of the stem

• Stimulates root growth in response to gravity

Describe the process of gravitropism in plant roots.

• Roots grow upward in response to gravity

• Roots grow sideways in response to gravity

• Roots do not respond to gravity at all

• Roots grow downward in response to gravity

What is the difference between tropism and nastism?

• Tropism involves random movement, while nastism involves directional response

• Tropism is a plant response, while nastism is an animal response

• Tropism involves directional growth or movement, while nastism does not involve directional response.

• Tropism and nastism are the same thing

Explain the concept of thigmotropism with an example.

• The growth of a vine wrapping around a trellis is an example of thigmotropism.

• Thigmotropism is the movement of plants in response to gravity, such as the growth of roots downwards into the soil.

• The growth of a vine towards sunlight is an example of thigmotropism.

• Thigmotropism is the response of plants to touch, such as the closing of a Venus flytrap when triggered by an insect.

How do single-celled organisms exhibit taxis?

• By moving toward or away from a stimulus in their environment

• By undergoing mitosis in response to a stimulus

• By photosynthesizing in response to light

• By communicating with other organisms

Discuss the role of environmental factors in influencing plant tropism.

• Tropism in plants is solely determined by genetic factors.

• Environmental factors have no impact on plant tropism.

• Environmental factors trigger hormone responses in the plant.

• Plants are not affected by environmental factors.