Morphology (Appearance and Structure):
* Seedling:
* Small: Typically only a few inches tall.
* Simple structure: Consists of a root, stem, and one or two leaves (cotyledons).
* Undifferentiated: Has not yet developed specialized organs like flowers, fruits, or a complete root system.
* Dependent on seed reserves: Draws energy from the seed's food store for initial growth.
* Adult Plant:
* Larger: Can vary greatly in size depending on the species.
* Complex structure: Possesses a well-developed root system, stem, branches, leaves, flowers (in flowering plants), fruits (in fruiting plants), and seeds.
* Specialized organs: Each organ has a specific function (photosynthesis, water absorption, reproduction, etc.).
* Independent: Relies primarily on photosynthesis for energy production.
Physiology (Functions):
* Seedling:
* Focus on root development: Prioritizes establishing a strong root system for water and nutrient absorption.
* Limited photosynthesis: Early leaves (cotyledons) are small and may not be fully photosynthetic.
* Rapid growth: Expends energy quickly to increase size and establish itself.
* Adult Plant:
* Balanced growth: Invests resources in all organs, including leaves for photosynthesis, stems for support, roots for absorption, and reproductive structures.
* Full photosynthesis: Larger, mature leaves efficiently capture sunlight for energy production.
* Stable growth: Growth is regulated to maintain a balance between resource allocation and environmental conditions.
Function:
* Seedling:
* Primary goal: To establish itself as an independent plant.
* Survival mode: Focuses on maximizing survival and growth in its initial environment.
* Adult Plant:
* Goal: To reproduce and pass on its genes.
* Mature stage: Invests energy in reproduction (flowers, fruits, seeds) and maintaining itself for longevity.
In summary:
A seedling is a young, dependent plant starting its life journey. An adult plant is a mature, independent organism focused on reproduction and long-term survival. The transformation from seedling to adult involves significant developmental changes in structure, function, and resource allocation.
