Biology Plant Growth and Development – Growth Phases, Plant Hormones & Development

Plant Growth and Development is the study of the processes through which plants increase in size, differentiate into specialized tissues, and complete their life cycle. Growth and development are regulated by genetic factors and plant hormones.

This chapter is highly important for NEET Biology and frequently appears in conceptual questions.

What is Plant Growth?

Plant growth is a permanent and irreversible increase in the size, volume, and mass of a plant due to cell division and cell enlargement.

Phases of Growth

Plant growth occurs in three main phases:

Cell Division Phase
Cell Elongation Phase
Cell Maturation Phase

These phases collectively contribute to the overall growth of the plant.

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Plant Development

Plant development includes all the changes that occur during the life cycle of a plant, from seed germination to flowering and fruit formation.

Differentiation

Differentiation is the process by which cells become specialized to perform specific functions.

Dedifferentiation and Redifferentiation

Plants possess the ability to regain and modify cellular functions during growth and regeneration.

Plant Growth Regulators

Plant growth and development are controlled by chemical substances known as plant hormones.

Major Plant Hormones

Auxins
Gibberellins
Cytokinins
Abscisic Acid (ABA)
Ethylene

These hormones regulate growth, flowering, fruit development, dormancy, and other physiological processes.

Importance of Plant Growth and Development

Controls plant life cycles.
Regulates flowering and fruiting.
Supports adaptation to environmental conditions.
Enhances agricultural productivity.
Maintains healthy plant growth.

Importance for NEET

Plant Growth and Development is a high-scoring chapter in NEET Biology. Questions are commonly asked on growth phases, plant hormones, seed germination, differentiation, and physiological effects of growth regulators.

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