Photoperiodicity: Short-day, Long-day and Day-Neutral Plants


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question 1 of 3

Plants such as cucumbers and rice do not require a critical length of daylight in order to bloom. These plants are best known as:

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1. In plants, the _____ are responsible for sensing the amount and length of sunlight.

2. A farmer grows roses and wants to be able to sell freshly blooming roses throughout the year. In order to control the time of flowering in his greenhouse, which would be the best plan?

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About This Quiz & Worksheet

Photoperiodic plants are divided into three categories: short-day, long-day and day-neutral. Test your knowledge on the distinction between these categories with this interactive quiz.

Quiz & Worksheet Goals

In this botany assessment you'll be asked to:

  • Name the term for plants that don't need a certain length of daylight so they can bloom
  • Identify the part of a plant that senses the amount of sunlight
  • State the term for plants that require at least 14 hours of sunlight to produce flowers
  • Name the term for plants that require less than 14 hours of sunlight to reach their blooming time
  • Understand how someone can control the blooming of flowers

Skills Practiced

This quiz and worksheet allow students to test the following skills:

  • Reading comprehension - ensure that you draw the most important information from the related lesson on short-day, long-day and day-neutral plants
  • Knowledge application - use your knowledge to answer questions about the critical length of sunlight for a flowering plant
  • Making connections - use knowledge of a plant's critical length to understand why plants flower in different seasons

Additional Learning

To learn more about flowers and their blooming periods, review the accompanying lesson called Photoperiodicity: Short-day, Long-day, and Day-Neutral Plants. This lesson covers the following objectives:

  • Identify the three classifications of photoperiodic plants
  • Understand what is the critical length for a flowering plant and identify what factors could change the critical length time
  • Define photoperiodism and photoreceptors
  • Give examples for short-day, long-day and day-neutral plants