Transport In Plants

Question 1

What do root hair do?

Answer 1

Absorbs water from the soil.the water then passes into the root and move up into the stem. The stem then carries the water up the stem to the leaves.

Question 2

What is evaporation and what does it do?

Answer 2

Evaporation takes place from the surface of the plants leaves.
Evaporation is the process of turning a liquid into a gas.
The evaporation of water from leaves is called transpiration.

Question 3

Which part of a plant absorbs water?

Answer 3

Root hairs

Question 4

Suggest why plants leaves need water.

Answer 4

Photosynthesis

Question 5

What are the specialised cells called in a vascular bundle?

Answer 5

Xylem and phloem

Question 6

What do phloem carry?

Answer 6

Dissolved food such as sugars

And the sugar is used for growth or stored as starch

Question 7

What is translocation?

Answer 7

This is when phloem cells carry dissolved food such as sugar from the leave to other parts of the plants

Question 8

What does xylem carry?

Answer 8

Xylem cells carry water and minerals from the roots to the leaves.

Question 9

What do xylem and phloem form?

Answer 9

Continuous vascular bundles from the roots to the stem and leaves.
This forms the transport system for the plant.

Question 10

Where does the water in the leaf come from?

Answer 10

1) water enters through roots hairs which have a large surface area to make water uptake easier
2) water travels up stem
3) some water is used in photosynthesis
4) some water escapes by evaporation

Question 11

What is a root hair?

Answer 11

A long thin cell

Question 12

What does a root hairs have?

How does it absorb water?

Answer 12

Large surface area which absorbs a lot water from the soil by osmosis.

Question 13

What does evaporation of water creates?

Answer 13

Evaporation of water creates a ‘suction’ effect.

This pulls the water up through the xylem cells in the stem.

Question 14

Why is this movement of water useful (suction effect)?

Answer 14

Because:
>evaporation of water cools a plant
>photosynthesis needs a supply of water
>a cell full of water gives support 
>the water carries useful dissolved minerals

Question 15

Apart from their taste, why are turnips and carrot eaten?

Answer 15

Contain a lot of food

Question 16

Explain how xylem cells support a tree.

Answer 16

Cell use cell wads of xylem has an extra layers of a chemical called lignin.

Question 17

What happens to xylem cells?

Answer 17

They die making long thin tubes of hollow lumen.

They are called vessels and are ideal to carry water

Question 18

What do phloem cell have?

Answer 18

Long and thin forming columns

Question 19

Why is phloem cells different than xylem?

Answer 19

They stay alive to be able to pass chemicals such as sugar from cell to cell

Question 20

What do leaves have to prevent water loss?

Answer 20

> a waxy covering called a cuticle

> stomata,which can open or close,mainly on its shaded underside.

Question 21

What are spongy mesophyll cell covered in?

Answer 21

A film of water

Question 22

How is carbon dioxide in valve with spongy mesophyll?

Answer 22

It dissolves in the water and used in photosynthesis

Question 23

In a tree there are more xylem cells than phloem cells. Suggest why.

Answer 23

Because the xylem cells die therefore more is produced which makes the tree stronger

Question 24

Why is a tree more likely to die if its phloem cells rather than its xylem cells are damaged?

Answer 24

Phloem cells pass chemicals such as sugar to every cell

Therefore if its damaged the cells won’t have any sugar which will kill the tree

Question 25

Why is wood strong?

Answer 25

Wood is made out of xylem and the cellulose cell wall of a xylem cell has extra layer of a chemicals called lignin