Question

for questions 24 to 26, read each question carefully. decide which of the choices best completes the statement or answers the question. place your answer in the blank space given.

1. an example of a biotic factor in an aquatic ecosystem is

a. a ph of soil equal to 6.5
b. a water temperature equal to 13.5°c
c. the presence of coyote tracks
d. the presence of whitestem pondweed

1. an example of an abiotic factor that is common to both terrestrial and aquatic ecosystems is

a. the ph of water
b. the amount of cloud cover
c. soil characteristics
d. the water temperature

1. a soil temperature of 12.2°c at a depth of 10 cm is an example of which type of factor?

a. an abiotic factor in a terrestrial ecosystem
b. a biotic factor in a terrestrial ecosystem
c. an abiotic factor in an aquatic ecosystem
d. a biotic factor in an aquatic ecosystem

Explanation:

• Question 24: Biotic factors are living components. Whitestem pondweed is a plant (living), while pH (chemical), water temperature (physical), and coyote tracks (not living organism itself) are abiotic.
• Question 25: Water temperature affects both land (e.g., soil temperature) and water (aquatic) ecosystems. pH of water is only for aquatic, cloud cover for terrestrial (not directly for aquatic in a common sense as much as temperature), soil characteristics for terrestrial.
• Question 26: Soil is part of terrestrial ecosystem. Temperature is a non - living (abiotic) factor.

Answer:

1. D. the presence of whitestem pondweed
2. D. the water temperature
3. A. an abiotic factor in a terrestrial ecosystem