Chapter 5

Question 1

What is the definition of nutrition?

Answer 1

The process by which organisms obtain their own food.

Question 2

What are the three types of heterotrophic nutrition?

Answer 2

1. Holozoic
2. Saprophytic
3. Parasitic

Question 3

What are the five steps of holozoic nutrition?

Answer 3

1. Ingestion
2. Digestion
3. Absorption
4. Assimilation
5. Egestion

Question 4

What are two adaptations of the ilium?

Answer 4

Long to ensure a large absorbing surface, the interior surface is not smooth but is folded

Question 5

What are the adaptations of a villi?

Answer 5

1. Each villus is lined with a hair-like structure called micro-villi to increase surface area for absorption
2. Each is richly supplied with blood vessels.
3. Each is lined by a thin epithelium to facilitate absorption.