Question

question 89
the process by which algae make the biomolecules they use for energy storage is.
a cellular respiration.
b photosynthesis.
c unique to algae.
d also found in some animals.
e dependent on oxygen.

question 90
organisms that obtain their own energy from sunlight are called
a autotrophs.
b heterotrophs.
c chemotrophs
d prototrophs.

Explanation:

• Question 89:
• Cellular respiration is the process of breaking down biomolecules to release energy, not making them. So A is wrong.
• Photosynthesis is the process by which algae (and plants) use sunlight to convert carbon dioxide and water into glucose (a biomolecule for energy storage) and oxygen. So B is correct.
• The process of photosynthesis is not unique to algae; plants also perform it. So C is wrong.
• Animals do not perform photosynthesis. So D is wrong.
• Photosynthesis produces oxygen, it is not dependent on oxygen. Cellular respiration is dependent on oxygen. So E is wrong.
• Question 90:
• Autotrophs are organisms that can produce their own food (energy - rich molecules) from sunlight (in the case of photo - autotrophs like algae and plants) or inorganic chemical reactions (chemo - autotrophs). So A is correct.
• Heterotrophs obtain energy by consuming other organisms. So B is wrong.
• Chemotrophs obtain energy from chemical reactions (usually involving inorganic compounds), not sunlight. So C is wrong.
• Prototrophs are organisms that can synthesize all the organic compounds they need from simple inorganic substances, but the term specifically related to energy from sunlight is autotroph. So D is wrong.

Answer:

Question 89: B. photosynthesis
Question 90: A. autotrophs