Unraveling the Control and Coordination of Plant Growth: Understanding Phototropism and Gravitropism

The video explains how plant growth is controlled and coordinated by hormones, particularly auxin. It covers how plants respond to environmental stimuli like light and gravity through processes called phototropism and gravitropism. Phototropism involves plant shoots growing towards light due to auxin distribution, while gravitropism involves shoots growing against gravity and roots growing with gravity. The video concludes with a recap of these concepts.

What is the primary role of plant hormones like auxin?

• To provide energy to the plant

• To supply nutrients to the plant

• To protect the plant from pests

• To control and coordinate plant growth

How do plants exhibit positive phototropism?

• By growing away from the light

• By growing towards the light

• By growing in random directions

• By not responding to light at all

What happens to auxin distribution when light comes from one side?

• Auxin disappears from the plant

• Auxin is evenly distributed

• Auxin accumulates on the shaded side

• Auxin accumulates on the side with more light

In gravitropism, how do plant shoots respond to gravity?

• They grow towards the gravitational pull

• They grow away from the gravitational pull

• They grow horizontally

• They do not respond to gravity

What effect does auxin have on root cells?

• It promotes their growth

• It has no effect

• It inhibits their growth

• It causes them to shrink

Which type of tropism involves plant growth in response to gravity?

• Hydrotropism

• Gravitropism

• Thigmotropism

• Phototropism

What is the main difference in auxin's effect on shoots versus roots?

• It promotes growth in both

• It inhibits growth in shoots and promotes growth in roots

• It inhibits growth in both

• It promotes growth in shoots and inhibits growth in roots