8.1 How Organisms Obtain Energy

What is the major source of energy for all life on Earth?

• natural gas

• the sun

• coal

• wind power

What does the first law of thermodynamics state?

• entropy increases

• energy is conserved

• metabolism decreases

• chemicals are produced

Autotrophs that convert light energy into chemical energy are called .

• photoautotrophs

• heterotrophs

• chemoautotrophs

• omnivores

All of the chemical reactions in an organism's cells are called ____

• hemotrophy

• autotrophy

• metabolism

• thermodynamics

What catabolic reaction is occurring in this cycle?

• photosynthesis

• cellular respiration

• absorption of sunlight

• conversion of sunlight

What chemical bond in ATP releases energy when broken?

• phosphate

• sulfur

• oxygen

• potassium

The group that makes their own food is ​ (a)   . The organisms in this group are called ​ (b)   . The group that must eat other organisms for food is ​ (c)   . The organisms in this group are called ​ (d)   . Some organisms get their energy from inorganic substances, such as hydrogen sulfide. These organisms are called ​​ (e)   .

• group B
• autotrophs
• group A
• heterotrophs
• chemoautotrophs

Circle the part of the ATP molecule that gets ripped off to release energy.

Which is not a characteristic of energy?

• cannot be created or destroyed

• is the capacity to do work

• exists in forms such as light, chemical, and mechanical

• changes spontaneously from disorder to order

Which organism depends upon an external source of organic compounds?

• autotroph

• heterotroph

• chemoautotroph

• photoautotroph