Plant Anatomy and Physiology

The margin is the outer edge of the leaf blade. Leaf margins can take many shapes, such as serrated, entire, or lobed.

Plant science is generally divided into three major fields: Agronomy (field crops), Horticulture (garden/specialty crops), and Forestry (trees and timber).

The midrib is the central, thickened vein that runs through the middle of a leaf blade, providing structural support and transport for nutrients.

Root hairs are tiny, hair-like extensions of the root epidermis that significantly increase the surface area for water and mineral absorption.

The root cap is a protective layer of cells at the very tip of the root that protects the apical meristem as the root pushes through the soil.

A complete flower must have all four whorls: sepals, petals, stamens, and pistils. If it is missing a male or female part, it is incomplete.

A perfect flower must contain both male and female reproductive parts. If it is missing either, it is considered imperfect (or unisexual).

Pollination is the transfer of pollen to the stigma. Fertilization occurs only when the pollen tube grows down the style and the male gametes fuse with the ovule. If the pollen is stuck in the style, fertilization has not occurred.

The terminal bud is located at the apex or tip of the stem and is responsible for primary growth in length.

Lenticels are small, porous openings in the bark of stems and roots that facilitate gas exchange between the internal tissues and the atmosphere. Xylem transports water, while nodes and internodes are structural regions of the stem.

Dioecious plants have male and female flowers on separate individual plants. Monoecious plants have both on the same plant.

Monoecious plants possess both male and female reproductive structures on the same individual plant. Dioecious plants have these structures on separate plants.

Roots perform multiple critical functions for a plant, including anchoring the plant in the soil, absorbing water and dissolved minerals, and storing food reserves like starch.

Leaves are the primary site of photosynthesis, where plants convert light energy into chemical energy (food). While other parts may contain chlorophyll, leaves are specialized for this process.

The four primary vegetative and reproductive parts of a typical angiosperm are the roots, stems, leaves, and flowers.

Plant Science is the broad field encompassing the study of plant structure, function, growth, and protection. Horticulture, Agronomy, and Forestry are specific branches or applications within this field.

An internode is the section of a plant stem located between two successive nodes, which are the points where leaves or buds attach.

The palisade mesophyll layer, located just beneath the upper epidermis, contains the highest concentration of chloroplasts and is the primary site for photosynthesis in most leaves.

In dicotyledonous stems, vascular bundles (xylem and phloem) are arranged in a distinct ring pattern around a central pith. Monocots have scattered bundles.

The two primary types of root systems found in plants are taproot systems (one main root) and fibrous root systems (many branching roots of similar size).

The apical meristem is the region of actively dividing cells at the tip of the root, responsible for primary growth and the development of new root tissues.

Carbon dioxide is a primary reactant in photosynthesis, along with water and light energy. Oxygen is a byproduct.

Glucose is the primary sugar produced during photosynthesis. Carbon dioxide is a reactant, and table salt is not involved.

Dicotyledonous plants typically have flower parts in multiples of four or five, whereas monocots typically have parts in multiples of three.

Monocotyledonous plants typically have flower parts in multiples of three, while dicots typically have parts in multiples of four or five.

Dicot stems are characterized by vascular bundles arranged in a ring pattern. Monocots have scattered vascular bundles throughout the stem.

Monocot stems are characterized by vascular bundles that are scattered throughout the ground tissue, unlike the ring arrangement found in dicots.

Dicotyledons, or dicots, are named for having two seed leaves (cotyledons) in their embryo. Monocots have only one.

Monocotyledons, or monocots, are named for having a single seed leaf (cotyledon) in their embryo. Dicots have two.