Transport in plants

Question 1

what does the phloem tube transport

Answer 1

sucrose food substances and sugars

Question 2

what does the xylem transport

Answer 2

water and mineral ions from root to leaves

Question 3

what is the structure of phloem tubes

Answer 3

elongated living cells with small pores to allow easy flow

Question 4

what is the structure of xylem tube

Answer 4

dead cells lignified for strength free passage of water

Question 5

by what method does phloem tubes work

Answer 5

translocation require energy from respiration both ways for immediate use of storage

Question 6

by what method do xylem tubes work

Answer 6

• transpiration from roots through xylem and out of leaves

Question 7

what is the transpiration stream

Answer 7

water is evaporated and diffused from leave causing slight shortage this is compensated by water drawn up from rest of plant through xylem to replace and drawn up from roots so constant transpiration stream

Question 8

how are plants adapted to photosynthesis

Answer 8

contain stomata which are tiny pores on lower surface of leave ( gas exchange) which allow co2 to and oxygen to be diffused in and out and water vapour to be lost via transpiration

Question 9

what is the role of guard cells

Answer 9

change shape to change size of pores when turgid stomata open and when flaccid stomata close

Question 10

what are the 3 factors to transpiration

Answer 10

• light intensity: photosynthesis only occur during day when bright if dark stomata close preventing co2 in and water vapour out
• temperature : particles have more kinetic energy so diffuse out
• air flow: diffusion of water vapour occurs when surrounding is low concentration of water so if better air flow water vapour swept away allowing low concentration outside of leave for diffusion