IB Biology 9.2

Which cells are alive but lack organelles?

• xylem cells

• companion cells

• tracheid cells

• sieve tube cells

What is the name of the structure that allows flow of material between phloem cells?

• cellulose

• sieve plate

• sieve cell

• tracheids

which best describes the flow of phloem?

• source to sink; one direction

• root to shoot; one direction

• source to sink; two directions

• root to shoot; two directions

Which are involved in translocation?

• living tissue

• thick cellulose

• starch

• companion cells

which of the following are transported in phloem?

• sucrose

• amino acid

• hormones

• acids

By what process are nutrients transported in phloem?

• transpiration - active

• translocation - active

• transpiration - passive

• translocation - passive

Which of the following allows transport of substances from a sieve element cell to a companion cell?

• pits

• plasmodesmata

• sieve plate

• cell wall

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

• apoplast pathway

• symplast pathwa

Which cells actively transport sucrose?

• Protein channels

• Companion cells

• Golgi apparatus

• phospholipids

What is the function of sinks?

• regulating the volume transported by the phloem

• Moral support for the phloem

• Storing molecules transported by the phloem

• Extracting molecules from the phloem for glycogen production