cell reaction to its environment (irritability) SSS 1

1) A description made using your five senses and/or scientific instruments

• Inference

• Hypothesis

• Observation

• Control

An apparatus commonly used to demonstrate phototropism is

• clinostat

• heliotropic chamber

• potometer

• arc auxanometer

Nastic movements differ from tropic movements in being

• Non directional

• Movements of variation

• Stimulated by chemicals

• Directional

If the stem grows towards sunlight and root grows just opposite to it, the stem movement is known as

• phototropic movement

• negative phototropic movement

• positive phototropic movement

• none of these

Poison ivy growing in a wall is an example of:

• gravitropism

• geotropism

• thigmotropism

• geotropism

Internal stimuli are chemicals, called _________ that a plant produces.

• light

• temperature

• tough

• hormones

The hormone responsible for regulating growth in plants is called:

• adrenaline

• glycogen

• auxine

• growth factor

The stem of a plant growing up is an example of:

• positive thigmotropism

• negative thigmotropism

• positive geotropism

• negative geotropism

Any change in an organisms environment that causes a response is...

• tropism

• photosynthesis

• cellular respiration

• stimuli

Positive tropism is movement...

• away from stimuli

• towards stimuli

• along stimuli

• all of the above