Movement of Substances Quiz

Guard cells regulate the opening and closing of stomata by changing their shape and controlling the size of the stomatal pore.

Oxygen (O2) is primarily exchanged through stomata during transpiration, while carbon dioxide (CO2) is taken in for photosynthesis.

Transpiration is the process of losing water vapor from the aerial parts of a plant, mainly through stomata in the leaves.

Phloem transports organic nutrients bidirectionally, both upward (from source to sink) and downward (from leaves to roots).

Stomata are the small openings on the surface of leaves that allow for the exchange of gases (such as carbon dioxide and oxygen) and the loss of water vapor through transpiration.

Transpiration pull, driven by the evaporation of water from the leaves, creates a negative pressure that pulls water and minerals up through the xylem from the roots to the leaves.

Root pressure is the process by which water and minerals are absorbed from the soil by plant roots and transported to the rest of the plant.

The phloem is responsible for the transport of organic nutrients, including sugars, from the leaves (source) to other parts of the plant (sink).

The primary function of the xylem is to transport water and minerals from the roots to other parts of the plant.