Stimulus/Response/Tropisms

Roots growing down is an example of

• negative hydrotropism

• positive geotropism

• negative geotropism

• tropism

Which the correct position of force arrows when a plant cell vacuole is turgid?

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Eventually overtime the stem (shoots) of a plant in a pot that is knocked over grows upward, not sideways. What type of tropism is this describing?

• hydrotropism

• negative geotropism

• positive geotropism

• positive hydrotropism

What is the stimulus that will cause a plant to grow toward a window?

• the stimulus of gravity

• turgor pressure

• the stimulus of light

• the stimulus of water

Two microorganisms are in a petri dish. A scientist adds sugar (stimulus) to the petri dish. One organism moves towards the sugar, the other does not, but is alive. What can be said about the organism that did not move?

• it does not have a mechanism that allows it move

• it does not respond to sugar stimulus

• it does not move fast enough for the scientist to see

• it only moves when stimulated by light

What causes a plant to wilt?

• roots not able to reach the water table

• the plant is not getting enough sunlight

• the plant is being pulled by gravity

• when there is little water in the plant cells

A rabbit sees a predator. What would be the appropriate flight or fight response?

• the rabbit will have a fight response to protect itself from the predator

• the rabbit will have a fight response to protect its food source

• the rabbit will have a flight response to protect itself from the predator

• the rabbit will have a flight response to find a new home

The following is an example of a negative tropism response.

• a seedling growing upward

• a plant growing towards a window

• a pea plant wrapping around a wire

• a sunflower following the sun

Which movement of water is responsible for turgor pressure?

• hypertonic

• isotonic

• hypotonic

A lizard is laying on the rocks on a sunny day. The lizard is trying to

• get a suntan

• confuse its predators

• getting water

• regulating its body temperature