Chapter 26, Problem 1TS

Summary Introduction

To determine:

The observation could make to support the hypothesis that “abscisic acid (ABA) is responsible for the turgor pressure changes that permit a plant to track the sun”.

Introduction:

The plant hormones also called as phytohormones. The plant hormones are chemical substances that regulate the growth of plants. There are five types of hormones present in plants: Auxin, Gibberellins, cytokinins, abscisic acid and ethylene. Auxins regulate the growth of plants, Gibberellic acid regulates the elongation of stems, cyokinin regulate the cell division in plants, abscisic acid helps the plant to survive under stress condition and ethylene causes the ripening of fruit.