Plant Responses and Growth Review & Reinforce

List three stimuli that produce responses in plants and give the name for each response.

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What is gravitropism? How can a plant show both a positive and a negative gravitropism?

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What is photoperiodism? What is its effect in many plants?

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What happens when a plant enters a state of dormancy?

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critical night length

• a hormone that controls a plant’s response to light

• a plant that flowers when the nights are shorter than

  a critical length

• a plant that flowers when the nights are longer than

  a critical length

• the number of hours of darkness that determines

  whether or not a plant will flower

auxin

• a hormone that controls a plant’s response to light

• a plant that flowers when the nights are shorter than

  a critical length

• a plant’s growth response toward or away from a

  stimulus

• a chemical that affects the growth and development

  of a plant

short-day plant

• a plant that flowers when the nights are shorter than

  a critical length

• a plant’s growth response toward or away from a

  stimulus

• a plant whose flowering cycle is not sensitive to

  periods of light and dark

• a plant that flowers when the nights are longer than

  a critical length

long-day plant

• a plant that flowers when the nights are shorter than

  a critical length

• a plant’s growth response toward or away from a

  stimulus

• a plant whose flowering cycle is not sensitive to

  periods of light and dark

• a plant that flowers when the nights are longer than

  a critical length

hormone

• a hormone that controls a plant’s response to light

• a chemical that affects the growth and development

  of a plant

• g. the number of hours of darkness that determines

  whether or not a plant will flower

day-neutral plant

• a plant that flowers when the nights are shorter than

  a critical length

• a plant’s growth response toward or away from a

  stimulus

• a plant whose flowering cycle is not sensitive to

  periods of light and dark

• a plant that flowers when the nights are longer than

  a critical length