Biosphere: (How Energy Enters The Biosphere) Flashcards

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1
Q

Study of ecology:

A

•1866 German-scientist Ernst Haekel invented term ecology.
•origin: Greek word —> house/home.
•ecology: the study of the relationships between living things (organisms) and their non-living surroundings, the environment.
•study of ecology may be large or small scale.

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2
Q

Divisions of the biosphere:

A

-biosphere: the narrow zone around the Earth that contains life.

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3
Q

Earths life system:

A

•system: object or group of objects that scientists study. The system may have distinct or arbitrary boundaries.
•TWO types of systems:
-open system: one that allows energy and matter to cross the systems boundary—to enter and leave it.
-closed system: one that allows only energy (but not matter) to cross the boundary.

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4
Q

Is Earth an open or closed system?

A

•in terms of matter, Earth is essentially a closed system.
-all the matter that is here, is here to stay.
-with the exception of meteorites and satellites etc.
•in terms of energy, the Earth is an open system
-suns energy enters, some energy is radiated back into space.

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5
Q

The need for energy:

A

•all organisms need energy to survive.
•energy on earth originates from the SUN.
•photosynthesis takes energy from the sun—> stores in high energy molecules (such as glucose).
•cellular respiration allows organisms to breakdown glucose and release energy that can be used to maintain life processes.

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6
Q

Life processes:

A

Growth, movement, repair, reproduction.

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7
Q

Albedo effect:

A

•albedo = the amount of reflected energy.
•light-coloured, reflective surfaces have higher albedo.
•dark-surfaces have lower albedo.

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8
Q

Fate of energy in the biosphere:

A

•matter cycles within the biosphere BUT energy passes through it and does not cycle.
•second law of thermodynamics: as energy is converted from one form to another, some energy is always lost in the form of heat (as no conversion is ever 100% efficient).
•this “lost” energy in the form of heat is NOT useable to any other living organisms (hence the name “lost”).

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