Movement of Phloem Sap from a Source to a Sink

question 67

Multiple Choice

Movement of phloem sap from a source to a sink

• A) occurs through the apoplast of sieve-tube elements.
• B) depends ultimately on the activity of proton pumps.
• C) depends on tension, or negative pressure potential.
• D) depends on pumping water into sieve tubes at the source.
• E) results mainly from diffusion.

---

Definitions:

Excess Supply

Excess Supply, also known as surplus, occurs when the quantity supplied of a good exceeds the quantity demanded at the current price.

Unregulated

Activities or industries that operate without governmental control or oversight.

Tires

Manufactured products designed to cover wheels, providing traction and absorbing shock for vehicles.

Excess Supply

A situation where the quantity of a good or service supplied exceeds the quantity demanded at the current price, leading to surplus.