Plant Transport OCR A A-Level Biology

Which of the following is not a reason large plants need transport systems?

• Low surface area to volume ratio

• High metabolic rate

• Ability to photosynthesise in all cells

• Large size

In a root, the xylem is arranged:

• In a ring near the outside

• In an X-shape in the centre

• Randomly scattered throughout

• In bundles between phloem

Which plant tissue transports water and minerals?

• Phloem

• Cambium

• Xylem

• Epidermis

Which structure forces water into the symplast pathway in roots?

• Casparian strip

• Cuticle

• Companion cell

• Sieve plate

In a dicot stem, the vascular bundles are arranged:

• In the centre in a star shape

• In a ring near the outer edge

• Evenly spaced in the cortex

• Randomly dispersed

Which is true of xylem vessels?

• They are living cells with sieve plates

• They have lignified walls and no cytoplasm

• They actively pump water

• They have companion cells for energy supply

Which cell type contains many mitochondria to provide ATP for active loading?

• Sieve tube element

• Xylem vessel

• Companion cell

• Guard cell

Which environmental factor would increase transpiration rate?

• High humidity

• High light intensity

• Low temperature

• Still air

Why does wind increase transpiration rate?

• Increases stomatal opening

• Removes boundary layer of moist air

• Increases relative humidity

• Increases root pressure

In the cohesion-tension theory, cohesion refers to:

• Attraction between water molecules and xylem walls

• Attraction between water molecules

• Attraction between water molecules and ions

• Attraction between water and guard cells