Plant Hormones - Tropisms & Auxins #52

The video tutorial explains how plants respond to environmental stimuli using hormones, particularly auxins. Unlike animals, plants rely on hormones to sense light, gravity, and touch, enabling them to grow towards light and anchor themselves in the soil. Auxins, a group of plant hormones, play a crucial role in controlling growth at the tips of shoots and roots. The video covers phototropism (response to light) and geotropism (response to gravity), detailing how auxins accumulate on shaded or lower sides, affecting growth rates and causing curvature in shoots and roots. The tutorial also discusses how roots respond to light exposure and gravity, emphasizing the opposite effects of auxins in roots compared to shoots.

How do plants primarily respond to environmental stimuli?

• By moving quickly

• By using hormones

• Through a nervous system

• Through sound waves

What is the primary role of auxins in plant growth?

• To transport water

• To produce seeds

• To control growth at the tips of shoots and roots

• To inhibit photosynthesis

What is phototropism?

• A response to gravity

• A response to light

• A response to water

• A response to temperature

In shoots, where do auxins accumulate to stimulate growth?

• On the lower side

• On the upper side

• On the shaded side

• On the sunny side

How do roots respond to light exposure?

• They grow towards the light

• They grow away from the light

• They grow upwards

• They stop growing