Transcript How It Works Presentation - Hillpark Secondary School

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W. McConnell 2004 Kinross High School
Revision Questions for
section (b) How it Works
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1. Give the definition of the
term ‘HABITAT’
Answer:
The area where an
animal or plant lives.
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What term is given to
2.
describe all the organisms
in a pond?
Answer:
Community.
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What is the meaning of the
3.
term ‘POPULATION’?
Answer:
All the organisms of one
kind which live in an area.
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4.
What term means the
community of organisms
together with their habitat?
Answer:
ECOSYSTEM
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5. What 3 parts are present in
all ecosystems?
Answer:
•Population
•Community
•Habitat
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6. What name is given to green
plants which make their food
by photosynthesis?
Answer:
Producers
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7.
What is a consumer?
Answer:
An organism which obtains
its food by feeding on other
organisms.
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8. Consumers can be divided into 3 groups:
a) What is a herbivore?
A consumer that feeds on
plants
b) What is a carnivore?
A consumer that feeds
on animals
c) What is an omnivore?
A consumer that feeds
on plants and animals
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9.
What do the arrows in a
food chain represent?
Answer:
The direction of the
flow of energy.
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10.
LEAVES
THRUSH
SNAIL
Using the organisms above, state which is the
primary consumer?
Answer:
The snail
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What name is given to many
11.
food chains which interconnect?
Answer:
A FOOD WEB
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Herring
12.
Mackerel
Shrimps
Animal Plankton
Blue whale
Plant Plankton
What will happen to the number of herring and mackerel
if fishermen catch large numbers of shrimps?
Answer:
The numbers will decrease.
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13. What happens to the size and number
of organisms as you move along the
food chain?
Size ?
…
…
Number?
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The size increases
The numbers decrease.
14. What is the meaning of the
term ‘Pyramid of Biomass’?
Answer:
The mass of all the
organisms at each level
in the food chain.
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15. How can energy can be lost
in a food chain?
Answer:
•Movement
•Waste
•Heat production
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16. How much energy is passed
on through each link in a food
chain?
Answer:
10%
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17. Suggest reasons for the
human population explosion.
Answer:
•Greater medical knowledge
•More food available
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18. What factors could limit the
growth of a population?
Answer:
•lack of space
•lack of food
•disease
•predators
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19.
Name the group of organisms
which help to release chemical
elements from dead bodies.
Answer:
Decomposers
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20.
Name 2 important elements
recycled by decomposers.
Answer:
•Nitrogen
•Carbon
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21.
Dead organisms
and waste
Ammonia
From the diagram,
state where the
nitrates in the soil
come from.
Answer:
Nitrite
Nitrate
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The dead organisms
and waste
22.
Dead organisms
and waste
Ammonia
Nitrite
Nitrate
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What type of
decomposer is
mainly responsible
for the changes
shown in the
diagram?
Answer:
Bacteria.
23.
Dead organisms
and waste
Ammonia
Nitrite
Nitrate
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What happens
during
‘nitrification’?
Answer:
Bacteria convert
ammonia into
nitrates.
24. What is meant by the term
’denitrification’?
Answer:
Bacteria convert
nitrates into nitrogen
gas.
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25.
How could you naturally increase
the nitrate level of the soil?
Answer:
Plant clover or add manure.
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26.
How could you artificially increase
the nitrate level of the soil?
Answer:
Add fertiliser
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