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What is the main source of energy in a clear-water stream in an open area?

◯ A. Dead leaves

◯ B. Chemosynthetic bacteria

◯ C. Algal blooms

◯ D. Sunlight

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Related questions

1) A chemoautotroph would use _____ as an energy source.

A carbon dioxide
B chemical bonds within high energy molecules
C sunlight
D heat energy

2) A photoheterotroph would use _____ as a source of carbon atoms.

A high energy organic molecules (e.g., sugars)
B sunlight
C carbon dioxide
D inorganic molecules

3) Biologists sometimes divide living organisms into two groups: autotrophs and heterotrophs. These two groups differ in _____.

A their electron acceptors
B their mode of nutrition
C the way that they generate ATP
D their sources of energy


1. Bacteria _______________ oxidize inorganic or organic chemical compounds to obtain their energy and _______________ derive their energy from sunlight.
2. If an organism uses CO2 as a carbon source it is _____________________, but if it extracts its carbon from organic compounds it is _____________________.
3. The vast majority of bacteria use ___________ _____________ as an energy source, _______________ ____________ as a carbon source and ____________ _____________ as a source of electrons and hydrogens because they are _________________________________.
4. If a bacterium that uses light and organic compounds to obtain its other nutrients is __________________________________, but if it uses light and CO2 as a carbon source it is ____________________________.
5. Fungi and most protozoa due to their C, energy and electron requirements are classified as _______________________________.
6. Bacteria that oxidize chemical compounds to obtain their energy and obtain their source of carbon and electrons from organic compounds say that they are ________________________.
7. Bacteria that oxidize inorganic chemical compounds to obtain their energy and electrons, but use CO2 as a carbon source are _______________________________.
8. Cyanobacteria are _________________________ because they use __________ as a source of energy, _____________ as a carbon source and _______________ as a source of electrons and hydrogen.
9. Nutrition in most bacteria occurs mainly by ___________________.
10. Most bacteria reproduce by _____________________, but some can be reproduced alternately by _______________ or ______________________.

Using a lake area as an example, match the following organisms with their appropriate group.

All of the trout in a lake

All the trout, birds, bacteria, algae, frogs, snakes, and insects around a lake

all the living things around a lake as well as the air, soil, and water

all the earthworms around a lake

A plant absorbing sunlight to produce chemical energy is an example of which characteristic of life?
A.

population
B.

community
C.

ecosystem

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