Plant Tropisms and Responses

This video tutorial covers the science standards for Texas 7.13a, 7.13b, and 7.7c, focusing on plant responses to external stimuli. It explains four types of tropisms: phototropism (response to light), geotropism (response to gravity), thigmotropism (response to touch), and hydrotropism (response to water). Each section details how plants react to these stimuli, with examples and explanations of positive and negative responses.

What is the primary focus of the tutorial video?

• Animal behavior

• Plant tropisms

• Human anatomy

• Weather patterns

What does phototropism refer to?

• A plant's response to water

• A plant's response to light

• A plant's response to touch

• A plant's response to gravity

Which direction do roots grow in response to gravity?

• Away from gravity

• Away from water

• Towards light

• Towards gravity

What is the response of a plant stem to gravity?

• Positive phototropism

• Negative geotropism

• Positive geotropism

• Negative phototropism

Which tropism involves a plant's response to the earth's gravitational pull?

• Phototropism

• Thigmotropism

• Geotropism

• Hydrotropism

What is the term for a plant's response to touch?

• Phototropism

• Geotropism

• Thigmotropism

• Hydrotropism

Which plant is known for closing its leaves when touched?

• Mimosa pudica

• Sunflower

• Cactus

• Bamboo

What is a common feature of plants that exhibit thigmotropism?

• They respond to gravity

• They respond to touch

• They grow towards water

• They grow towards light

What is the main stimulus in hydrotropism?

• Light

• Gravity

• Touch

• Water

How do roots behave in hydrotropism?

• They grow away from water

• They grow towards water

• They grow towards light

• They grow away from gravity