Question

chapter 3

1. an ecosystem consists of

a) a physical environment within which a biological community lives.
b) the species with which a biological community interacts.
c) a biological community and its physical environment.
d) the primary producers within a biological community.
e) all the species in a biological community.

1. the length and complexity of a food - web in the arctic would be ________ when compared to one in the tropical rainforest.

a) short and less complex
b) short and more complex
c) long and less complex
d) long and more complex
e) about the same

1. producers rely on the process of ______ to release chemical energy and consumers rely on the process of ______ to release chemical energy.

a) cellular respiration; photosynthesis
b) cellular respiration; cellular respiration
c) photosynthesis; cellular respiration
d) photosynthesis; photosynthesis
e) the sun; the sun

1. primary consumers are also known as

a) carnivores.
b) scavengers.
c) decomposers.
d) herbivores.
e) top carnivores

Explanation:

• Question 27: An ecosystem is defined as a biological community and its physical environment, which includes both biotic and abiotic components interacting with each other.
• Question 28: The Arctic has a harsher environment with fewer species and less biodiversity compared to the tropical rain - forest. So, the food web in the Arctic is shorter and less complex.
• Question 29: Producers (like plants) use photosynthesis to convert light energy into chemical energy stored in glucose. Consumers (animals and other non - producers) use cellular respiration to break down glucose and release chemical energy.
• Question 30: Primary consumers feed on primary producers (plants). Herbivores are organisms that eat plants, so primary consumers are also known as herbivores.

Answer:

1. C. a biological community and its physical environment
2. A. short and less complex
3. C. photosynthesis; cellular respiration
4. D. herbivores