Question

1. explain how each type of organism gets its nutrients:

a: chemoheterotrophs:
b: photoheterotrophs:
c: photoautotrophs:
d: chemoautotrophs:

Explanation:

• A. Chemoheterotrophs: Obtain energy from chemical compounds (organic) and carbon from organic sources. For example, many bacteria and fungi. They break down complex organic molecules (like sugars, proteins) through processes like respiration.
• B. Photoheterotrophs: Use light as an energy source but get carbon from organic compounds. Some purple non - sulfur bacteria are photoheterotrophs. They can use light to generate ATP (adenosine triphosphate) but still rely on organic molecules for carbon.
• C. Photoautotrophs: Utilize light energy to convert carbon dioxide (\(CO_2\)) into organic compounds (such as glucose) through photosynthesis. Plants, algae, and cyanobacteria are examples. The general equation for photosynthesis is \(6CO_2 + 6H_2O+light

ightarrow C_6H_{12}O_6 + 6O_2\).

• D. Chemoautotrophs: Obtain energy from inorganic chemical reactions (e.g., oxidation of ammonia (\(NH_3\)), hydrogen sulfide (\(H_2S\)) etc.) and use carbon dioxide (\(CO_2\)) as a carbon source. Nitrifying bacteria (which oxidize ammonia to nitrites and nitrates) are chemoautotrophs.

Answer:

A. Chemoheterotrophs get energy from chemical compounds (organic) and carbon from organic sources.
B. Photoheterotrophs use light as energy source and carbon from organic compounds.
C. Photoautotrophs use light energy to convert \(CO_2\) into organic compounds.
D. Chemoautotrophs obtain energy from inorganic chemical reactions and carbon from \(CO_2\).