Tropism

What is tropism?

• Tropism is the biological phenomenon where an organism responds to an environmental stimulus by growing or moving in a particular direction.

• Tropism is the study of ancient artifacts

• Tropism is a type of weather pattern

• Tropism is a type of musical instrument

What is phototropism?

• Phototropism is the growth of an organism in response to temperature

• Phototropism is the growth of an organism in response to gravity

• Phototropism is the growth of an organism in response to light, either towards or away from it.

• Phototropism is the growth of an organism in response to sound

What is the role of auxin in phototropism?

• Auxin causes the plant to remain stationary and not respond to the light source in phototropism.

• Auxin promotes cell elongation on the shaded side of the plant, causing it to bend towards the light source in phototropism.

• Auxin inhibits cell elongation on the shaded side of the plant, causing it to bend away from the light source in phototropism.

• Auxin has no role in phototropism, it is solely controlled by other plant hormones.

What is geotropism?

• Geotropism is the process of a plant growing towards water

• Geotropism is the growth or movement of a plant in response to gravity, such as the roots growing downward and the stems growing upward.

• Geotropism is the movement of a plant in response to light

• Geotropism is the ability of a plant to change color based on temperature

What is the difference between positive and negative phototropism?

• Positive phototropism is when a plant grows towards the light source, while negative phototropism is when a plant grows away from the light source.

• Positive phototropism is when a plant grows in the absence of light, while negative phototropism is when a plant grows in the presence of light.

• Positive phototropism is when a plant grows downwards, while negative phototropism is when a plant grows upwards.

• Positive phototropism is when a plant grows away from the light source, while negative phototropism is when a plant grows towards the light source.

What are the factors that influence phototropism in plants?

• Soil pH, temperature, and humidity

• Plant size, leaf color, and root depth

• The factors that influence phototropism in plants include light intensity, light direction, and the presence of plant hormones such as auxin.

• Water availability, air pressure, and wind speed

Explain the mechanism of phototropism in plants.

• Phototropism is the growth of plants in response to sound waves.

• Phototropism is caused by the movement of water within the plant.

• Phototropism is the growth of plants in response to light. It is controlled by the hormone auxin, which moves to the shaded side of the plant, causing elongation of cells and bending towards the light source.

• Phototropism is controlled by the hormone gibberellin.

What is the reaction that is shown by the plant in the figure above?

• Positive hydrotropism.

• Negative phototropism.

• Positive thigmotropism.

• Negative geotropism.

Auxins are responsible for _____________ of a plant

• Colour change

• Watering

• Phototropism

• Growth

Where is auxin formed

• Tip of stem and root

• Leaves

• Embryo

• All