Movement of Substances through Plants
1. The diagram shows a section through a plant leaf.
A
B
(a) Name two tissues in the leaf that transport substances around the plant.
.............................................................. and ...........................................................(1)
(b) Gases diffuse between the leaf and the surrounding air.
(i) What is diffusion?
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................................................................................................ (2)
Name one gas that will diffuse from
(ii) point A to point B on the diagram on a sunny day. ............................................
(iii) point B to point A on a sunny day......................................................................
(iv) point A to point B when it is dark.........................................................................
(v) point B to point A when it is dark.........................................................................
(vi) point A to point B all the time……………………………………….......................………(5)
(c) Circle a GUARD CELL on the diagram.
(1)
2. The xylem brings water and dissolved mineral salts up from the roots to the leaves.
(a) Evaporation of water through the stomata is called …………………………............….(1)
(b) Fill in the table below to show how different conditions affect the rate of water loss
from the leaf
Environmental
conditions
Effect on transpiration
rate
(faster / slower)
Reason it has this effect
High temperature
High humidity
High light intensity
Windy
(6)
(c) Wilting occurs when …………………………………………………….............................………..
.................................................................................................................................... so
that………………………………………………………………………………………………………………….(1)
(d) Fill in this table to compare phloem and xylem:
Transport tissue
xylem
phloem
What does it
transport?
Which direction does it
carry materials?
Where does it take
materials?
Alive or dead?
Thick or thin cell walls?
(8)