Geotropism and Plant Responses

The video tutorial explains geotropism, the response of plants to gravity, highlighting that roots are positively geotropic, moving towards gravity, while shoots are negatively geotropic, moving away. It discusses the role of auxins in this process, with auxins accumulating on the lower side of roots, causing downward curvature. An experiment is demonstrated using a petri dish and germinating seeds to observe these effects. The results show roots bending downwards, confirming positive geotropism, and shoots bending upwards, indicating negative geotropism.

What is geotropism?

• The response of plants to light

• The response of plants to water

• The response of plants to gravity

• The response of plants to temperature

How do plant roots typically respond to gravity?

• They move towards gravity

• They move away from gravity

• They do not respond to gravity

• They move sideways

What is the effect of auxins on the lower side of roots?

• They accelerate growth

• They cause roots to curve upwards

• They inhibit growth

• They cause roots to curve downwards

What materials are needed for the geotropism experiment?

• A large petri dish, germinating seeds, and filter papers

• A microscope, soil, and water

• A thermometer, seeds, and a petri dish

• A ruler, seeds, and sunlight

How should the seeds be placed in the petri dish for the experiment?

• All seeds facing sideways

• One seed facing downwards, one upwards, and one sideways

• All seeds facing downwards

• All seeds facing upwards

What is the purpose of placing the petri dish in the dark during the experiment?

• To allow light to reach the seeds

• To ensure the seeds dry out

• To keep the seeds warm

• To prevent light from affecting growth

After a few days, how do the roots in the petri dish respond to gravity?

• They grow sideways

• They bend downwards

• They remain straight

• They bend upwards

What does the bending of young shoots away from gravity indicate?

• Positive geotropism

• No geotropism

• Negative geotropism

• Neutral geotropism

What conclusion can be drawn from the experiment regarding root growth?

• Roots are positively geotropic

• Roots grow randomly

• Roots do not respond to gravity

• Roots are negatively geotropic

What conclusion can be drawn from the experiment regarding shoot growth?

• Shoots are negatively geotropic

• Shoots are positively geotropic

• Shoots grow randomly

• Shoots do not respond to gravity