Translocation

Question 1

what is translocation?

Answer 1

the transport of organic compounds in the phloem from source to sink.

Question 2

is translocation an active process?

Answer 2

yes

Question 3

what are assimilates?

Answer 3

the products of photosynthesis that are transported.

Question 4

what is the main assimilate transported around the plant?

Answer 4

sucrose.

Question 5

what are the main sources of assimilates?

Answer 5

• green leaves and green stems.
• storage organs
• food stores in seeds when they germinate.

Question 6

what are the main sinks of assimilates?

Answer 6

• growing roots
• meristems that are dividing
• parts of the plant laying down food stores (developing seeds, fruits, storage organs.)

Question 7

what are the main steps of translocation?

Answer 7

• phloem loading
• phloem unloading

Question 8

what are the two main ways of phloem loading for transport?

Answer 8

• symplast route
• apoplast route

Question 9

how do assimilates move through the symplast route?

Answer 9

moves through the cytoplasm of the mesophyll cellsand into the sieve tubes by diffusion through plasmodesmata .

Question 10

how do assimilates move through the apoplast route?

Answer 10

moves through the cell walls and inter-cell spaces to the companion cells and sieve elements. by diffusion along concentration gradient.