OCR translocation

What is translocation in plants?

• Release of water vapour into the atmosphere through stomata
• Movement of assimilates such as sucrose in the phloem
• Absorption of water through root hair cells
• Uptake of minerals through roots

What is the primary function of translocation in plants?

• Providing water for photosynthesis
• Transporting minerals to the roots
• Moving sucrose between sources and sinks
• Facilitating gas exchange in leaves

How is sucrose loaded into companion cells in the phloem?

• Osmosis
• Active loading with ATP
• Diffusion
• Facilitated diffusion

What causes water to enter sieve tube elements in the phloem?

• Increase in sucrose concentration
• Decrease in sucrose concentration
• Increase in pressure potential
• Decrease in pressure potential

How does water move in the phloem tube?

• From an area of low pressure to an area of high pressure
• From an area of higher pressure to an area of higher pressure
• From companian cells to sieve tube elements
• From roots to leaves

What causes sucrose to be removed from sieve tube elements at the sink?

• Diffusion
• Active transport
• Osmosis
• Photosynthesis

What is the role of plasmodesmata in translocation?

• Transport sucrose into companion cells
• Facilitate water movement into sieve tube elements
• Link companion cells and sieve tube element cells
• Release water vapour into the atmosphere

What happens to pressure in the phloem at the sink?

• Increases
• Decreases
• Remains constant
• Fluctuates

What drives the mass flow of water in translocation?

• Hydrostatic pressure gradient
• Sucrose concentration gradient
• ATP production
• Photosynthesis

What is the ultimate destination of sucrose in translocation?

• Companion cells
• Xylem vessels
• Phloem sieve tube elements
• Surrounding cells at the sink