Plant Stimuli Response Quiz

The turning or bending of a plant, such as climbing plants or other organism in response to a touch stimulus.

• Thigmotropism

• Hydrotropism

The growth of the parts of plants with respect to the force of gravity.

• Phototropism

• Geotropism

The growth or turning of plant roots toward moisture.

• Phototropism

• Hydrotropism

The ability of the plant to re-orient the shoot growth towards a direction of light source.

• Phototropism

• Hydrotropism

Why do plants exhibit phototropism?

• Photosynthesis requires light.

• Photosynthesis avoids light.

What happens to a potted plant placed on its side in terms of geotropism?

• The stem will grow downwards

• The stem will eventually bend to grow upwards

What makes a tropism positive or negative?

• Positive = movement towards stimulus, Negative = movement away from stimulus

• Negative = movement towards stimulus, Positive = movement away from stimulus

Match the following

• Movement of roots of a plant toward gravity

• Phototropism

• Movement of a plant toward light

• Geotropism/Gravitropism

• Movement of roots of a plant toward water.

• Hydrotropism

Which part of the plant is primarily involved in positive gravitropism/geotropism?

• Leaves

• Roots

What is the main difference between tropism and nastic movements in plants?

• Tropism is a growth movement, while nastic movements are non-directional responses.

• There is no significant difference; they are terms used interchangeably.