Tropisms and Movement Responses

The video tutorial covers the concepts of taxis, kinesis, and tropisms, explaining how organisms respond to stimuli. It details the stimulus-response pathway, provides examples of different types of movement, and compares taxis and kinesis. Tropisms are introduced with examples of plant growth responses. The video concludes with review questions to reinforce learning.

What is the role of a receptor in the response mechanism of an organism?

• To coordinate a response

• To detect a stimulus

• To change the environment

• To produce a response

Which of the following is an example of positive phototaxis?

• Worms moving away from light

• Algae moving towards light

• Bacteria moving away from glucose

• Plants growing away from gravity

How does kinesis differ from taxes?

• Both are random movements

• Both are directional movements

• Kinesis is directional, taxes is random

• Kinesis is random, taxes is directional

What is a key characteristic of tropisms?

• They involve the whole organism moving

• They are random movements

• They are directional growth responses

• They do not involve stimuli

Which behavior is shown when an organism moves towards a stimulus?

• Positive taxes

• Negative tropism

• Random kinesis

• Negative taxes

What advantage does a control group provide in an experiment?

• It introduces new variables

• It serves as a baseline for comparison

• It ensures all groups are identical

• It helps in avoiding competition

What type of behavior is indicated by random movement and changing speed?

• Tropism

• Kinesis

• Phototaxis

• Taxes

Which of the following is an example of negative gravitropism?

• Roots growing towards gravity

• Algae moving towards light

• Bacteria moving towards glucose

• Shoots growing away from gravity

What is the main difference between taxes and tropisms?

• Both are random responses

• Taxes involve growth, tropisms involve movement

• Taxes are random, tropisms are directional

• Taxes involve movement, tropisms involve growth

Why do roots grow towards gravity?

• To avoid light

• To absorb water from the soil

• To escape predators

• To perform photosynthesis