DP 9.1 Plant Biology

The casparian strip causes:

• Water to move through plasmodesmata

• Water to move from the apoplastic to symplastic pathway

• Water to move from the cytoplasm to the cell wall

• Water to be actively transported with cations in the soil

Which of the following is NOT an adaptation of the structure of the leaf?

• Waxy cuticle to prevent evaporation of water

• Palisade mesophyll cells concentrated on the bottom of the leaf to maximise photosynthesis

• Stomata found on the underside of leaves to reduce transpiration

• All are adaptations

How are minerals transported into root hair cells?

• H+ are pumped into the soil to create a concentration gradient for minerals to diffse into the roots

• H+ are pumped into the soil and bind to positively charged ions before being pumped into the roots.

• H+ are pumped into the soil to displace cations from soil. Cations are pumped into root hair cells.

• The high surface of root hair cells.

(Select all that apply) Xylem vessels are found in:

• Roots

• Stems

• Leaves

What strengthens the walls of xylem to prevent their collapse?

• Tracheids

• Endodermis

• xylem vessels

• lignin

What is the function of xylem?

• Transports water for photosynthesis

• Transports water and minerals bidirectionally to plant tissues that require them.

• Transports water and minerals unidirectionally from the roots to the leaves of plants.

• Transports hormones, amino acids and surcrose for storage

What is transpiration?

• Perspiration of excess water in plants

• The loss of water due to photosynthesis

• The rate of water update

• The loss of water vapour from the stomata of plants

K+ ions diffuse out of guard cells. What will most likely happen immediately after?

• Water will diffuse out of guard cells

• Stomata will open

• Stomata will close

• Water will diffuse into guard cells

The vascular bundle is made up of:

• Xylem

• Casparian strip

• Phloem

• Root hair cells

Which statement is false?

• Mature xylem is non-living

• Transpiration is a consequence of gas exchange

• Xylem facilitates movement of water bidirectionally

• Most water enters a plant via the apoplastic pathway