Biology TEKS Correlations
(12) Science concepts. The student knows that interdependence and interactions
occur within an ecosystem. The student is expected to:
(E)investigate and explain the interactions in an ecosystem including food chains, food webs, and food pyramids.
47.
Bacteria are essential to a balanced ecosystem because they are —
A.
B.
C.
D.
decomposers
disease carriers
limited by temperature
simple life forms
This item could have been placed under Biology TEKS (4)(D), which is concerned with the
importance of bacteria. But it is important for students to recognize the role decomposers play
in a food web. Most food webs do not have the decomposers labeled. Make sure your students
are aware of the role these important organisms play in the environment.
Number of Coyotes and Jackrabbits
48.
Year
Coyotes
Jackrabbits
1994
19
328
1996
32
141
1998
21
402
2000
36
127
2002
16
351
2004
33
101
The diagram shows the number of coyotes and jackrabbits in a nature preserve from 1994 through 2004.
Which conclusion is best supported by these data?
A.
B.
C.
D.
The jackrabbit population and the coyote population increase at the same time.
Jackrabbits are decreasing in number because coyotes are eating them.
Coyotes destroy the plants that provide food for jackrabbits.
The coyote population increases after an increase in the number of jackrabbits.
Charles A. Dana Center
Science TEKS Toolkit
www.sciencetekstoolkit.org
Microscopic Algae
Daphnia
Hydra
Water Plants
Carp
Dragonfly Larva
Water Beetles
Pond Snails
49.
Leeches
Which organism is both a first-level and a second-level consumer in the food web above?
A.
B.
C.
D.
Dragonfly larva
Carp
Pond snail
Daphnia
Charles A. Dana Center
Science TEKS Toolkit
www.sciencetekstoolkit.org