How is the relation between the BIRTH RATE and DEATH RATE when a population increases in size?
Birth rate > death rate
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20
Which factors limit the population growth?
Predation, competition for resources, famine, wars,diseases ...
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10
A _______ is an organism that gets its energy from dead or waste organic.
decomposer
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15
A _____ __ ______ has levels which represent the dry weight of species in a food chain.
pyramid of biomass
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15
A _____ __ ______ has levels which represent the number of each species in a food chain.
pyramid of numbers
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15
Define the term POPULATION
A group of organisms of one species, living and interacting in the same area at the same time.
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20
Identify the cycle of the picture and name its 4 main processes.
Water cycle. Processes: Evaporation, Condensation, Precipitation, Transpiration.
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15
A food chain shows the transfer of 1._______ from one organism to the next, beginning with a 2._________, which obtains its energy from the 3. __________.
1. energy / 2.producer / 3. sun
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20
In a 1._____ _ ______, we represent the energy at each trophic level. The producers at the bottom, have the _____ amount of enery.
1. pyramid of energy / 2. greatest, largest
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15
Define the term ECOSYSTEM
A biological system that contains a COMMUNITY of organisms together with non-living parts of the envirnment, interacting together.
