EXERCISE 3
Page 42
Interactions and interdependencies
Interactions and interdependencies
1 Give one word for the following descriptions:
1.1 The sum total of all the ecosystems on Earth.
Biosphere
1.2 Interdependence in ecosystems
Symbiosis
Interactions and interdependencies
1.3 A group of one type of living organism found in one
habitat.
Population
1.4 The variety of life that is found in one ecosystem.
Biodiversity
Interactions and interdependencies
1.5 A relationship where one party benefits while the other
party is neither advantaged nor disadvantaged.
Commensalism
1.6 All the organisms of a specific type that live in an
ecosystem.
Population
Interactions and interdependencies
1.7 All the populations in one habitat
Community
1.8 An area where all living and non-living factors interact with
each other and are interdependent on each other, e.g. a
jungle.
Ecosystem
Interactions and interdependencies
1.9 A relationship where both parties benefit.
Mutualism
2. Match column A to column B by writing down the correct
letter next to the description:
Interactions and interdependencies
Column A
Column B
The relationship
between
ants and plant lice
C A. Parasitism
The area where plants and animals
live.
E B. Ecology
Interactions and interdependencies
Column A
The relationship
between a clown
fish and an
anemone.
Column B
C. Mutualism
D
Interactions and interdependencies
Column A
Column B
D.
A herd of springbok on the grasslands F
Commensalism
The study of living organisms and the
B E. Habitat
places they live.
Interactions and interdependencies
Column A
The relationship
between humans and
tapeworms
Column B
A F. Population
Interactions and interdependencies
3 Study the photos below and answer the questions that
follow:
Interactions and interdependencies
3.1 What is the difference between biotic and abiotic factors
in an ecosystem?
Biotic factors: living organisms in an ecosystem
Abiotic factors: non-living factors in an ecosystem
3.2 Name four biotic factors you can observe in the photos.
Any four:
Elephant, leopard, giraffes, buffalo, trees, grass
Interactions and interdependencies
3.3 Name three abiotic factors you can observe in the photos.
Any three:
Soil, climate, sunlight, oxygen, carbon dioxide
3.4 What type of symbiosis exist between the leopard and
the tree?
Commensalism
Interactions and interdependencies
3.5 Explain your answer to Question 3.4.
The leopard finds shelter in the tree.
Leopards pull their prey into trees to protect it from
larger and stronger predators.
The leopard benefits from this relationship, but the tree
is not disadvantaged.