Transcript Science 10 - SharpSchool

Science 20
Review
• Abiotic factors are physical, non living parts of
the environment
• Biotic factors are living organisms in the
environment
• Ecosystems are all the organisms in an area as
well as the abiotic factors which they interact
Examples of Abiotic and Biotic factors
• biotic- living
dog
cat
humans
fish
worms
abiotic-nonliving
temperature
moisture
light
soil
air currents
Symbiosis
• Symbiosis occurs in mainly ecosystems
– Is a long lasting ecological relationship that benefits at
least one organism of two different species that live in
close contact
• Mutualism – a symbiotic relationship in which
both species benefit
• Commensalism – a form of symbiosis in which
one organism benefits, and the other organism is
neither helped not harmed
• Parasitism – a symbiotic relationship in which one
organism called the parasite, derives benefits at
the expense of another organism called a host
Predator – Prey Interactions
• Predator- Prey Interactions
– This is the interaction between two organisms
that is not long lasting and the species do not
necessarily live together
– Predation – an interaction where one organism,
the predator, kills and eats another organism,
called the prey.
• Competition
– An interaction in which two or more organisms
compete for the same limited resource
Food Chain and Food Webs
• Food Chain – a pathway along which food is
transferred from one trophic level to the next
• Food Web – The interconnecting feeding
relationships within an ecosystem
Energy Pyramid
0.0001%
0.001%
0.01%
0.1%
1%
Biomass Pyramid
Pyramid of Numbers
Answers to Questions
27 – The term food web comes from how
appearance of the chart as it looks like a
spider web. Everything is connected to one
another throughout it.
28) a) Algae
b) Tadpole, mosquito larvae, water flea, and
snail
c) Frog, dragonfly, stickleback, Northern Pike
d) Perch, Giant Water Bug, Grebe, Northern
Pike
• 29
• A) The producers are demonstrated as the
basis for the food web because it is the only
organism connected to the rest. The energy
obtained by the other organism is based on
the plants or producers
• B) Herbivores are the second trophic level
because they eat the plants (producers) and
then they are eaten by other organisms.
• C) The tertiary organisms as they consume the
most secondary organisms which eat the
producers.
• 30)
Grebe, Giant Water Bug, Perch
Northern Pike
Frog, Dragonfly, Stickleback,
Northern Pike
Tadpole, Mosquito, Waterflea, Snail
Algae
• 3) The arrows show where the energy is
transferred. Its shows that the plant is
transferring energy to the herbivore etc.
• 4) Producers are organisms that can make
their own food ie plants through
photosynthesis. Consumers have to receive
food from other organisms.
• 5) Producers