ecosystem
Unit 1
Unit 1
Which statement best describes an organism's environment? Tick one box.
The other organisms and physical factors in the surroundings
The other animals in the surroundings
The resources in the surroundings
The amount of water in the surroundings
The other organisms and physical factors in the surroundings
What do the arrows in a food chain represent?
Flow of energy
Describe two physical factors in a desert habitat.
Any abiotic component
Lana says, 'humans could not survive without plants. Is this true? Explain why.
Yes, it is true, because plants form the start of the food chain and ______ on to consumers. We would
________ without plants.
allow energy to be passed
have no food
you sees some tiny insects on a tree trunk.
Name a piece of equipment that you could use to collect these insects.
you decides to make some detailed drawings of the insects she has collected.
What piece of equipment would help her observe the insects in detail?
Pooter
magnifying glass
Explain what is meant by the term bioaccumulation.
Bioaccumulation is the build-up of a substance in
the tissues of an organism because the substance
cannot be broken down and is not excreted.
Organism is given give Habitat
Tilapia fish ,Hawk ,Worm
River
tree
Soil
A reason why the dolphin will have the highest concentration of mercury in its body.
The plankton absorb the mercury from the ocean. The plankton are eaten by the shrimp, but because the shrimp eat lots of plankton the concentration of mercury is higher in the shrimp than in the plankton. This process continues up the food chain so the dolphin ends up with the highest concentration of mercury/the mercury builds up in the food chain.(workbook)
Because of the concept of bio magnification the toxic substance started to build from the producer to the dolphins
How are they used?
quadrat
pooter
pitfall trap
square frame used to take samples of a
population in a habitat
device used to carefully suck small
organisms into a collecting jar
jar buried in the ground to collect small
organisms that walk on the ground
Explain why there are fewer organisms at higher trophic levels.
Energy is lost between each trophic level and so each trophic level contains less energy than the one before and can therefore support fewer organisms.