Plant Transport and Physiology

Mosses are non-vascular plants that lack true roots. Instead, they use root-like structures called rhizoids to anchor themselves and absorb water from their environment.

Plants that lack specialized vascular tissue (xylem and phloem) for transporting water and nutrients are classified as non-vascular plants, such as mosses and liverworts.

The cuticle is a waxy, waterproof layer covering the leaves and stems of plants that helps prevent excessive water loss through evaporation.

Xylem is the vascular tissue responsible for transporting water and dissolved minerals from the roots to the rest of the plant. It consists of hollow, dead cells that form tubes for efficient water movement. Phloem transports food, while xylem handles water and mineral transport.

Bryophytes and hepatophytes lack true vascular tissue (xylem and phloem) to transport water and nutrients efficiently over long distances. Consequently, they rely on osmosis and diffusion, which requires a moist environment to prevent desiccation and facilitate reproduction.

Desert plants, or xerophytes, have evolved specialized adaptations such as succulent stems or leaves to store water, allowing them to survive in arid environments for extended periods.

Roots are the primary organs responsible for absorbing water from the soil to support the plant's physiological needs.

The xylem tissue within the stem acts as a transport system, moving water and dissolved minerals from the roots to the rest of the plant.

Monocot leaves are typically isobilateral, meaning they have stomata on both the upper and lower epidermis to facilitate gas exchange.

Guard cells are specialized cells that surround the stoma and regulate its opening and closing by changing their turgor pressure.

Carbon dioxide enters the leaf through the stomata via the process of diffusion, moving from an area of higher concentration in the atmosphere to an area of lower concentration inside the leaf.

Phloem is the vascular tissue responsible for the translocation of organic nutrients (sugars/food) from the leaves to other parts of the plant.

Xylem is the vascular tissue that transports water and dissolved minerals from the roots upward to the leaves and other parts of the plant.

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

Diffusion is a slow process and is not dependent on a living system. Diffusion is very important to plants since it the only means for gaseous movement within the plant body. Intake of carbon dioxide and release of oxygen through stomata occurs through the process of diffusion. Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.