Plants, photosynthesis and respiration

1
Plants, photosynthesisandrespiration
Name _____________________
2
Things needed for photosynthesis
The green chemical that _______ the light is
called chlorophyll
_______ ________ gas comes from the air.
Words water, traps, energy, carbon dioxide
_________ travels up from the roots
3
Things made by photosynthesis
Plants make the carbohydrate called
______________. This is important as a food for
animals.
_________ gas goes into the air. This is
important because animals need it for breathing.
Words oxygen, glucose
4
Photosynthesis equations
Sunlight
Carbon dioxide _____ glucose _____ 6CO2
6H20 C6H12O6 6O2
Chlorophyll
Sunlight
Chlorophyll
Plants store the GLUCOSE produced by
photosynthesis by joining it together in a
____________ reaction to make ____________
Words starch, water, oxygen, polymerisation
5
Respiration
Respiration is the opposite of photosynthesis.
It is a reaction that makes _______ for living
things by reacting glucose and oxygen.
________ comes from the food and _________ comes
from the air.
_________ __________ gas and ________ are
breathed back out.
Words carbon dioxide, energy, water, oxygen,
glucose
6
Gas Exchange
The amounts of gases we breathe in and breathe
out are not the same.
Air breathed in
Air breathed out
21
18
79
79
7
Global warming
It is important that the processes of
photosynthesis and respiration are balanced to
make sure the levels of oxygen and carbon dioxide
in the air stay the _____. Too much carbon
dioxide can cause _______ ________.
The amount of carbon dioxide in the air is
getting higher because of two main reasons.
More trees are being _______ down so they do not
absorb so much carbon dioxide.
We are burning more _______ ________ like petrol
and this makes carbon dioxide.
Words fossil fuels, cut, same, global warming
8
Using plants for food
Fruits and seeds
Roots
Leaves
Stems
9
Helping plants to grow
Farmers can use a number of chemicals to help
plants to grow
Words herbicides, potassium, pesticides,
nitrogen, fungicides, fertilisers, phosphorus
10
disadvantages of pesticides
Pesticides are toxic chemicals so care needs to
be taken when they are being used. They can also
get into our food by being washed into rivers and
streams and moving into the food chain.
Although the level of insecticides in the plants
is small, it will build up through the food chain
due to the number of organisms in each stage.