Chapter 45.2, Problem 1CYL

Summary Introduction

To explain:

The roles of phytohormones in seed germination, seed dormancy, and directional growth of emerging root and shoot.

Introduction:

Phytohormones or plant growth regulators are chemicals that regulate the growth of plants. The term “phytohormones” was introduced by Went and Thimann in 1937. Plant hormones are present in extremely low concentrations within the cell. Plant hormones are present in trace amounts in plants.

Summary Introduction

To explain:

The term thigmotropism.

Introduction:

Plants respond to various stimuli. These stimuli include gravity, water, light, touch, and chemicals. The growth of plant organs in response to these stimuli is termed as tropism. These can be positive or negative.

Summary Introduction

To determine:

The mechanism through which plants balance root and shoot growth.

Introduction:

Phytohormones or plant growth regulators are chemicals that regulate the growth of plants. The term “phytohormones” was introduced by Went and Thimann in 1937. Plant hormones are present in extremely low concentrations within the cell. Plant hormones are present in trace amounts in plants.

Summary Introduction

To determine:

The mechanism by which some plants sense and respond to light and darkness.

Introduction:

Photoperiodism refers to the physiological reaction of different organisms towards the length of night or day. It categorizes plants into long-day, short-day, and day-neutral plants. Plants that flower, when they reach the proper developmental stage after germination independent of photoperiod, are known as day-neutral plants.

Summary Introduction

To explain:

The mechanism by which hormones coordinate maturation of seeds and fruit and control fruit ripening.

Introduction:

Phytohormones or plant growth regulators are chemicals that regulate the growth of plants. The term “phytohormones” was introduced by Went and Thimann in 1937. Plant hormones are present in extremely low concentrations within the cell. Plant hormones are present in trace amounts in plants.

Summary Introduction

To determine:

The mechanism by which hormones control senescence.

Introduction:

The progressive degradation of the functional body system is called senescence. It is basically the process of growing old. It is also referred to as biological aging. Aging refers to both cellular level and organism level. Both the cells and organism start to have continuing deteriorative changes.