Transport in Plants

Question 1

Why do plants need transport system?

Answer 1

• Needs substances like water, minerals and suagr to live - Need to get rid of waste substances
• Have a small surface area to volume ratio
• Have a relativly high metabolic rate
• Exchanging substances by diffusion is too slow to meet metabolic needs, so need transport systems to move substances fast too and from individual cells

Question 2

Two types of tissue involved in transport?

Answer 2

Xylem and phloem tissue

Question 3

Role of xylem tissue

Answer 3

-Transport water and mineral ions in solution from the roots to the leaves

Question 4

Role of phloem tissue

Answer 4

-Transport sugar (in a solution) up and down the plant

Question 5

What system do xylem and phloem make up?

Answer 5

Vascular system

Question 6

What other function does xylem have?

Answer 6

-Support of plants structure

Question 7

In a plant cross-section, is xylem or phloem shown to be on the outside?

Answer 7

Phloem

Question 8

Where are xylem and phloem in the root?

Answer 8

-The centre providing support for the root as it pushes through the soil

Question 9

Where are xylem and phloem in the stem?

Answer 9

-Near the outside, providing a ‘scaffolding’ that reduces bending

Question 10

Where are xylem and phloem in the leaves?

Answer 10

-Making up a network of veins which support the thin leaves

Question 11

Adaptations of xylem vessles?

Answer 11

• The cells making up the wall are dead, so water can travel up it like a vessel without being used
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Question 12

What are plant cells thicken with?

Answer 12

-A woody substance called lignin

Question 13

What does lignin do?

Answer 13

-Heps support the walls and stop them collapsing inwards