Question 1

Which of the following best describes the four main stages of food processing in animals, in the correct order?

Accepted Answer

Ingestion, digestion, absorption, elimination

Question 2

Which feeding mechanism is used by animals such as whales that strain small organisms or food particles from the surrounding medium?

Accepted Answer

Filter feeding

Question 3

In the enzymatic hydrolysis of sucrose by sucrase, which of the following equations correctly represents the reaction?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11}} + \mathrm{H_2O} \xrightarrow{	ext{Sucrase}} \mathrm{C_6H_{12}$$O_6$$} + \mathrm{C_6H_{12}$$O_6$$}$

Question 4

Why is chemical digestion necessary for animals?

Accepted Answer

Because animals cannot directly use large molecules in food as they are too large to pass through cell membranes and are not identical to the molecules needed by the animal.

Question 5

Which of the following is a key evolutionary adaptation that prevents animals from digesting their own tissues during food processing?

Accepted Answer

Processing food within specialized digestive compartments

Question 6

In hydras, digestion begins in the gastrovascular cavity. What is the next step after digestive enzymes break down food into small particles?

Accepted Answer

Food particles are engulfed and digested in food vacuoles by cells of the gastrodermis.

Question 7

Which of the following best distinguishes a gastrovascular cavity from an alimentary canal?

Accepted Answer

A gastrovascular cavity functions in both digestion and distribution of nutrients, while an alimentary canal is a complete digestive tube with separate mouth and anus.

Question 8

Which feeding mechanism is characterized by animals living in or on their food source and eating their way through it, as seen in caterpillars and earthworms?

Accepted Answer

Substrate feeding

Question 9

A python swallows a deer whole, a process that best exemplifies which feeding strategy?

Accepted Answer

Bulk feeding

Question 10

Which of the following statements about absorption is correct?

Accepted Answer

Absorption is the uptake of small molecules such as amino acids and simple sugars by the animal’s cells.

Question 11

Why are nutrients from a recently ingested meal not considered 'inside' your body prior to absorption?

Accepted Answer

Because they are still in the digestive tract, which is continuous with the outside environment.

Question 12

Which of the following is a similarity between digestion in an animal body and the breakdown of gasoline in an automobile engine?

Accepted Answer

Both processes involve the breakdown of large molecules to release usable energy.

Question 13

Which of the following best describes the function of lysosomes in intracellular digestion?

Accepted Answer

They fuse with food vacuoles to bring hydrolytic enzymes into contact with food particles.

Question 14

Which of the following animals is most likely to have a crop for storing food and a gizzard for grinding food, based on the alimentary canal diagrams?

Accepted Answer

Bird

Question 15

Which feeding mechanism is used by animals such as mosquitoes and bees, which suck nutrient-rich fluid from a living host?

Accepted Answer

Fluid feeding

Question 16

What is the main advantage of having an alimentary canal over a gastrovascular cavity?

Accepted Answer

It allows for the ingestion of food while earlier meals are still being digested.

Question 17

Which of the following best explains why mechanical digestion is important before chemical digestion?

Accepted Answer

It increases the surface area of food, making chemical digestion more efficient.

Question 18

In the context of food processing, what is the primary role of enzymatic hydrolysis?

Accepted Answer

To break covalent bonds in macromolecules by adding water, producing smaller molecules.

Food Processing in Animals: Ingestion, Digestion, Absorption, and Elimination

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