Plant Tropisms and Movements

The video explores plant movements, focusing on tropism, a directional growth response to stimuli. It explains different types of tropism, such as phototropism, geotropism, and chemotropism, and contrasts them with nastic movements, which are non-directional. The video also covers how to name tropic movements based on stimuli and provides examples to illustrate these concepts.

What is the primary difference between animal and plant movements?

• Animals move towards food, plants do not move.

• Animals move in response to stimuli, plants do not respond to stimuli.

• Animals move visibly, while plant movements are often growth-related and less visible.

• Animals move randomly, plants move in a fixed direction.

Which of the following best describes phototropism?

• Roots growing away from gravity.

• Growth of plant shoots towards light.

• Leaves closing when touched.

• Movement of plants towards water.

How does gravitropism affect plant growth?

• Shoots grow towards the earth.

• Shoots grow against gravity, while roots grow towards it.

• Roots grow away from the earth.

• Plants grow horizontally.

What characterizes nastic movements in plants?

• They depend on the direction of light.

• They are non-directional and not growth-related.

• They are growth-related and directional.

• They occur only in response to touch.

Which stimulus is associated with thigmotropism?

• Gravity

• Light

• Water

• Touch

What is hydrotropism?

• Movement towards light.

• Movement towards or away from water.

• Movement in response to touch.

• Movement towards gravity.

In chemotropism, what guides the growth of the pollen tube?

• Chemical signals

• Water

• Gravity

• Light

What is the term for movement towards a stimulus?

• Neutral tropism

• Nastic movement

• Positive tropism

• Negative tropism

Which of the following is an example of negative phototropism?

• Shoots growing towards light.

• Roots growing away from light.

• Leaves closing when touched.

• Roots growing towards water.

How do roots typically respond to gravity?

• They grow towards gravity.

• They do not respond to gravity.

• They grow away from gravity.

• They grow horizontally.