Question

1.6. Sierra is asked to demonstrate how carbon travels from the atmosphere to living organisms, then

back to the atmosphere. She draws a diagram showing carbon dioxide from the atmosphere being
taken in by a plant. An animal then consumes the carbon dioxide in the plant, uses it as a source of
energy, then exhales, returning the carbon dioxide to the atmosphere.
What step in this diagram needs to be corrected?
A. Animals do not release carbon dioxide; only plants do.
B. Animals do not use carbon dioxide as an energy source; they use carbohydrates.
C. Plants do not transfer carbon to animals; animals absorb it directly from the atmosphere.
D. Plants do not absorb carbon dioxide from the atmosphere; they only absorb it from the ground.

Answer 1

B. Animals do not use carbon dioxide as an energy source; they use carbohydrates.

Step-by-step explanation:

The most readily form of energy that an animal requires is carbohydrate molecules. Monosaccharide carbohydrates can be easily broken down and hence are the best sources of energy. Carbohydrates are broken down in the process of cellular respiration to generate ATP. ATP is the energy driving molecule which is required by every cell of an organisms body to carry out its normal metabolic functions. Hence, animals use carbohydrates as a source of energy, not carbon dioxide.