This document contains 8 questions about plant and organism responses to stimuli. The questions ask about: 1) positive and negative tropisms using gravity as an example, 2) the difference between tropisms and nastic movements, 3) whether magnetotropism in organisms is a taxism, kinesis, tropism, or nastic movement, 4) where positive thigmotropism would be found, 5) why organisms can sense stimuli, 6) the difference between taxis and kinesis with an example, 7) that Dondiego de la noche opening its petals at night is an example of nyctinasty and why this occurs, and 8) whether bacteria can respond to stimuli and how.

1. ANSWER THE QUESTIONS:
1) Use the example of gravity to explain how a tropism can be positive or
negative. Draw a picture.
2) What is the difference between tropisms and nastic movements? Give an
example.
3) Some organisms have the ability to sense a magnetic field and coordinate
movements in response, orienting toward the Earth´s poles. Is this a taxism, a
kinesis, a tropism or a nastic movement? Which organisms must have this
ability?Why?
4) Thigmotropism is a movement in which a plant grows in response to touch
or contact stimuli. In what type of plant do you expect to show a positive
thigmotropism?
5)Why are we able to sense stimuli?
6)What is the difference between taxisms and kinesis? Give an example.
7) Dondiego de la noche is a plant that opens it petals at night. It is an example
of what?Why do you think that happens?
8) Can a bacteria respond to sitimuli? Explain.