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Topic 4/C: Ecology part 1 Flashcards | StudBud
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Topic 4/C: Ecology part 1
Topic 4/C: Ecology part 1
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IB Biology SL Topic 4: Ecology
Flashcards
20 cards
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Practice quiz
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Host live
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Questions
20
Answers
1
why must marking technique not harm the animal?
to prevent mark from rubbing off
to prevent changes in their survival rate
to prevent animal from learning to avoid trap
all of the above
2
Which of the following ecological units includes abiotic factors?
An ecosystem
A community
A population
A trophic level
3
what is MSY?
a level of fishing achieved by non-commercial fishing
a level of fishing that does not scrape the ocean floor
a level of fishing that guarantees fish stock will remain
the level of fishing that guarantees fisherman keep jobs
4
which is not a harvesting management strategy for fisheries?
longer/more closed seasons
establish marine reserves
use of drift nets
quotas
5
In a food chain, what does the arrow represent?
Is eaten by
The movement of the animal
Eats
Agression between species
6
What sort of organisms is mark and recapture used for?
Plant populations
Mobile animal populations
Sedentary animal populations
Extremely rare or shy animal populations
7
What are the characterisitics of an “r” strategy?
Few offspring, short life expectancy and low parental care
Many offspring, short life expectancy, and low parental care
Few offspring, long life expectancy and high parental care
Many offspring, long life expectancy and low parental care
8
Why are there usually no more than 3 or 4 trophic levels?
Competition for territory
Loss of energy between trophic levels
There can only be one king of the kingdom!
Droughts and floods
9
which method is most often used to estimate fish age?
Lincoln Index
Echo location
quadrat sampling
Growth rings in the ear
10
Which characteristic describes a detritivores' digestion?
Internal digestion of dead matter
External digestion of dead matter
Internal digestion of live/only recently dead organic matter
No digestion - produces own energy
11
Which conditions are likely to favour an “r” strategy?
a stable environment
a predictable environment
an unstable environment
an old population
12
What is the energy transfer level from kangaroo rat to the weasel shown in the food web above?
1/4 of the energy transfer from the quail to the bobcat
About the same as the energy from meadow mouse to opossum
3x greater than the energy from the roadrunner to the bobcat
1/2 the energy from chaparral plants to the meadow mouse
13
What is a mesocosm?
An experiment we need to know for our IB biology exam?
Closed system to act an an experimental area
Jar/tank with orgaisms in it
Closed system which recyles energy and nutrients
14
What is the purpose of chi-squared testing?
To determine the standard deviation between two sets of data
To determine if two sets of data are significantly different
To make the IB bio exam harder by incorporating more maths
To deterine the average number of organisms in a quadrat
15
Which group converts carbon into a form that is available to primary consumers?
decomposers
Saprotrophs
producers
detritivore
16
How do sapratrophs digest dead matter?
Secrete digestive enzymes then absorb products
Act as a parasite and use another organism's nutrients
They don't
Internally in a digestive system
17
What is wrong with a long time interval between the sampling in mark and recapture?
too much chance for birth, death or migration
species can disperse evenly again
sampling will not be random
mark will wear off
18
What characteristics describe a detritovore's digestion?
External digestion of dead matter
Internal digestion of live/only recently dead organic matter
Internal digestion of dead matter
No digestion - produces own energy
19
Estimate pop. size if 20 were caught & marked, then 50 were caught and 10% of those had marks?
200
5
100
20
20
What is the usual units used in an energy pyramid?
kJ m-2 year-1
J m-2 year-1
J km-2 month-1
J year-1
