Mass Flow

Question 1

Describe the processes involved in transport of sugars in plant stems

Answer 1

Sucrose is actively transported into the phloem by companion cells. This lowers water potential in phloem and water enters by osmosis, producing high hydrostatic pressure. Mass flow towards sink, where the sugars are removed

Question 2

What is translocation?

Answer 2

Where products of photosynthesis are transported from a source to a sink by phloem

Question 3

How are sieve tubes adapted for mass transport?

Answer 3

Few organelles so easier flow

Question 4

How are companion cells adapted for mass transport?

Answer 4

Mitochondria release energy for active transport

Question 5

What is structure of phloem?

Answer 5

A tube formed from sieve tubes with no end walls between cells