Transcript Plants and Photosynthesis

Plants, photosynthesis
and
respiration
Name _____________________
Things needed for photosynthesis
SUNLIGHT
Gives the plant _________
_______ ________
gas comes from the
air.
_________ travels up
from the roots
The green
chemical
that
_______
the light is
called
chlorophyll
Words: water, traps,
energy, carbon dioxide
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
Photosynthesis equations
Carbon dioxide + _____
Sunlight
Chlorophyll
glucose + _____
Sunlight
6CO2
+ 6H20
Chlorophyll
C6H12O6 + 6O2
Plants store the GLUCOSE produced by photosynthesis by
joining it together in a ____________ reaction to make
____________
Words –starch, water, oxygen, polymerisation
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
Gas Exchange
The amounts of gases we breathe in and breathe out are not
the same.
Air breathed in
0.03%
21%
Air breathed out
Oxygen
3%
18%
Nitrogen
79%
Carbon
dioxide
79%
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
Using plants for food
Fruits and
seeds
Roots
Leaves
Stems
Helping plants to grow
Farmers can use a number of chemicals to help plants to grow:
1) ____________
Provide nutrients The elements
plants need are __________,
___________ and __________
2) ____________
3) _____________
Kill pests like
greenfly
4) _____________
Kill bacteria and
prevents plant
Kill weeds
diseases.
Words: herbicides, potassium, pesticides, nitrogen, fungicides,
fertilisers, phosphorus
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.
Small plants
Marine insects
Fish
Kingfisher
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.