Chapter 23, Problem 14A

Summary Introduction

To write:

The difference between long-day plant and short-day plant.

Introduction:

Flower is the most beautiful part of a plant. Certain plants only flowered at certain times of the year. This response of flowering plant is known as photoperiodism. The beginning of flower development for each plant species was a response to a range in the number of darkness. This range of hours is called the critical period of plants.

Explanation of Solution

Depending upon the critical period flowering plants can be classified into four different groups. They are short-day plants, long-day plants, intermediate-day plants, and day-neutral plants. The difference between short-day plants and long-day plants are given below.

Long-day plants	Short-day plants
The number of exposure hours of darkness is less than its critical period.	The number of exposure hours of darkness is greater than its critical period.
They flower during the summer.	They flower during the winter and spring.

Conclusion

Thus, the long-day plants and short-day plants can be differentiated according to their critical period.