CHAPTER 8 TRANSPORT IN PLANTS (Week 13)

An example of adhesion is

• Water molecules sticking to each other
• Water molecules sticking to cellulose in xylem walls
• Magnets sticking to a metal wall
• Gravity pulling water down

water movement through cellulose cell wall without entering protoplast of root cells is called

• symplast pathway

• vacuolar pathway

• apoplast pathway

• cellulose pathway

which theory of water transport states that hydrogen bonding allows water to maintain a continuous fluid column as water is pulled from roots to leaves

• Fusion

• Evaporation

• Pressure flow

• Cohesion-tension

Root pressure is caused by

• active loading of water molecules into xylem vessels by endordermis cells

• active loading of salts into xylem vessels by endodermis cells

• xylem vessels using energy to actively load water upwards

• movement of water molecules upwards in xylem vessels through osmosis

The casparian strip at the endodermis blocks which pathway

• Apoplast

• Symplast

• Transpiration

• Evaporation

How do water and mineral ions enter a plant?

• water is by active transport in root hari cells, mineral ion is by osmosis in root hair cells

• water is by osmosis in root hair cells, mineral ion is by active transport in root hari cells

• water is through the stomata, mineral ion is through the root

• water is through the root, mineral ion is through the stomata

What happens first during translocation in the phloem?

• water enters the sieve tubes by osmosis

• sucrose enters the sieve tubes by active transport

• water leaves the sieve tubes by osmosis

• sucrose leaves the sieve tubes by active transport

The pressure flow model for phloem translocation states..

• that sink strength drives transport in the pholem

• that transport in treachery elements is pressure dependent

• the water potential gradient in the sieve elements drives transport

• the pressure gradient between the sieve elements at the source and the sink drives phloem transport

What is the best words to describe sugar source and sugar sink

• Both are plants organ and act as storage

• Sugar sink can be either roots, fruit or mature leaves and sugar source is shoots

• Sugar source act as site for sugar production and sugar sink will store sugar

• Companion tube carry food from a sugar source to a sugar sink

In an apple tree, it is expected that the sugars produced by the tree would flow from (i)____________ to (ii)__________________.

Choose the option that would correctly fill in the terms in the sentence above.

• (i) a leaf (ii) a growing apple

• (i) the trunk (ii) a leaf

• (i) the roots (ii) a growing shoot

• (i) a growing shoot (ii) a leaf