Transcript answer - Calderglen High School

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1.
Name the process where green
plants make their own food?
answer
Photosynthesis
2.
What is the food made by green
plants during photosynthesis?
answer
Starch
(the plant produces glucose and
then stores this as starch)
3. Name some foods which
contain starch?
Pasta
Bread
Potatoes
Rice
answer
4.
Give the word equation for
photosynthesis
answer
Carbon
dioxide + Water
Sunlight
----->
Starch + Oxygen
(plants
makes
glucose stored as
starch)
5.
Name the chemical test for starch?
answer
Iodine solution
6.
How can you tell if a green plant has
been carrying out photosynthesis?
answer
It will contain STARCH in the leaves
7.
Give the colour change for an iodine
solution test with starch?
answer
The iodine solution changes
from brown to blue-black
8.
Which of the two plants will be able to
make glucose (stored as starch) from
photosynthesis?
answer
The plant in light
9.
Put these steps to test a leaf for starch
in the correct order ?
answer
•
1.
2.•
•
3.
4.•
Rinse the leaf - to remove the excess
alcohol
Boil
the leaf – this bursts the plant cells open.
Add iodine
to test
for starch
Place
the leafsolution
in ethanol
(alcohol)
– to remove
Place
thecolour.
leaf in ethanol (alcohol) - to
the
green
remove
colour. the excess alcohol
Rinse
the the
leafgreen
- to remove
Boiliodine
the leaf
– this bursts
Add
solution
to test the
for plant
starchcells
open.
10. Why would these plants be kept in the dark
prior to use in a photosynthesis experiment
answer
So that there is no starch in the leaves before carrying out the experiment
11.
Which plant can make its own food by
photosynthesis.
answer
The plant with carbon dioxide
can make its own food by
photosynthesis
Water
Plant with carbon
dioxide
Carbon
dioxide
absorber
Plant with NO carbon
dioxide
12. Which gas will be collected in the
measuring cylinder? Why?
•Oxygen.
•Because the plant is
carrying out photosynthesis
answer
13.
What is the test for STARCH?
answer
IODINE
turns from
BROWN to BLUE / BLACK
14 What is the test for oxygen?
The oxygen will relight a
glowing wooden taper
answer
15.
What do you call the process in which
a plant makes its own food using the
energy from the sun?
answer
Photosynthesis
16. Why should ethanol NOT be heated
using a bunsen burner?
answer
Ethanol is flammable and
cannot be taken near the
Bunsen burner.
17. What is bicarbonate indicator used to
test for?
answer
carbon dioxide levels.
18.
Complete the table to show the
correct bicarbonate indicator colours
answer
Carbon dioxide level Colour of bicarbonate
in air
indicator
Low
Lowlevel
level
Purple
Normal
Normallevel
level
Red
High
High level
level
Yellow
19.
What colour would bicarbonate
indicator show for a water plant in light?
Purple (low level carbon dioxide)
This is because the plants use up
carbon dioxide
answer
20.
What colour would bicarbonate
indicator show for a water plant kept in the
dark?
answer
Yellow (high level of carbon dioxide) This is
because the plants cannot photosynthesise
21. What do plants provide us with?
answer
Oxygen and food.
22. How is photosynthesis affected as you
move the plant closer to the light?
answer
The more light the more it will
photosynthesise.
The closer the light is moved
towards the beaker – the more
bubbles of oxygen are produced.
23. What can plant growers use to help
plants grow successfully?
answer
Plant growers can use
chemicals to help plants grow
successfully.
24.
What does a HERBICIDE do?
answer
Herbicides kill unwanted
plants (weed killers)
25.
What does a FUNGICIDE do?
answer
Fungicides kill fungal
infections
26.
What do INSECTICIDES do?
answer
Insecticides kill insects that
would eat the plants
27.
What do fertilisers contain?
answer
Fertilisers contain chemical
such as nitrogen that help the
plants to grow.