Plant Responses and Tropisms

The video discusses plant responses, focusing on phototropism and geotropism. It explains how plants grow towards light (positive phototropism) and against gravity (negative geotropism) in shoots, while roots grow towards gravity (positive geotropism). The role of aux-in, a plant hormone, in these processes is highlighted. Observations of daffodils demonstrate these responses. The video outlines learning outcomes, including understanding these terms and their advantages.

What is the main focus of the video tutorial?

• Human anatomy

• Animal behavior

• Plant responses and tropisms

• Weather patterns

What is phototropism?

• Growth in response to gravity

• Growth in response to light

• Growth in response to water

• Growth in response to temperature

What advantage does phototropism provide to plants?

• Better water absorption

• Increased resistance to pests

• Improved light capture for photosynthesis

• Enhanced nutrient uptake

How does auxin contribute to phototropism?

• By reducing leaf size

• By inhibiting root growth

• By causing cell elongation on the light side

• By causing cell elongation on the dark side

Where does auxin accumulate in a plant shoot?

• In the flowers

• On the dark side

• On the light side

• In the roots

What is geotropism?

• Growth in response to temperature

• Growth in response to light

• Growth in response to gravity

• Growth in response to water

How do roots respond to geotropism?

• They grow sideways

• They stop growing

• They grow downwards

• They grow upwards

What is the advantage of positive geotropism in roots?

• Improved water and mineral absorption

• Increased photosynthesis

• Better light exposure

• Enhanced seed dispersal

What was the likely stimulus for the daffodils to curl?

• Water availability

• Negative geotropism

• Temperature change

• Light from above

What should students be able to describe after watching the video?

• The role of auxin in geotropism

• The role of auxin in thermotropism

• The role of auxin in phototropism

• The role of auxin in hydrotropism