Transpiration and translocation

Question 1

what is the process of phloem tubes transporting food

Answer 1

1) made of columns of elongated living cells with small pores in the end walls to allow cell cap to flow through

2) they transport food substances made in leaves to the rest of the plant for immediate use or for storage

3) the transport goes in both directions

4) this process is called translocation

Question 2

what is the process of xylem tubes taking water up

Answer 2

1) made of dead cells joined end to end with no end walls between them and a hole down the middle. they are strengthen with a material called lignin

2) they carry water and mineral ions from the roots to the stem and leaves

3) the movement of water from the roots, through the xylem and out of the leaves is called the transpiration stream.

Question 3

what is transpiration( loss of water from the plant) caused by

Answer 3

1) by the evaporation and diffusion of water from a plants surface. most transpiration happens at the leaves

2) this evaporation creates a slight shortage of water in the leaf, and so more water is drawn up from the rest of the plant through the xylem vessels to replace it

3) this in turn means more water is drawn up from the roots, and so there is a constant transpiration stream of water through the plant