حل أوراق عمل Flow of Energy العلوم المتكاملة الصف السابع انسبير
حل أوراق عمل Flow of Energy العلوم المتكاملة الصف السابع انسبير
Answer Key with Questions
Lesson Check: Flow of Energy
1) Consumers produce their own food.
True
False
Correct Answer
False
2) Energy cycles through ecosystems because it returns to the Sun.
True
False
Correct Answer
False
3) Available energy increases as it is transferred from one organism to another in a food chain.
True
False
Correct Answer
False
4) ?Which of the following would eat a dead rabbit
A) carnivore
B) detritivore
C) herbivore
D) omnivore
Correct Answer
B) detritivore
5)? Which of the following would eat a hamburger with lettuce on it
A) carnivore
B) detritivore
C) herbivore
D) omnivore
Correct Answer
D) omnivore
6) ?Which of the following eats only eucalyptus leaves
A) carnivore
B) detritivore
C) herbivore
D) omnivore
Correct Answer
C) herbivore
7) ?Which is most likely the first step in a basic food chain
A) The snake obtains energy by eating the mouse.
B) Plants make energy-rich food using sunlight.
C) The Sun emits energy.
D) The hawk obtains energy by eating the snake.
Correct Answer
C) The Sun emits energy.
8) Which of the following organisms would NOT be in the first trophic level of an energy pyramid
A) dog
B) tree
C) grass
D) algae
Correct Answer
A) dog
9) ?Which is a model of feeding relationships
A) protein building
B) food map
C) food web
D) sugar molecules
Correct Answer
C) food web
10)____. As you move upward, from level to level, in an energy pyramid, available energy
A) decreases
B) increases
C) stays at the same level
D) is destroyed
Correct Answer
A) decreases
11) This food web that shows the interaction of the organisms in an ecosystem.
a. Complete the table by matching the numbers with the organisms in the food web to show the interaction in the ecosystem.
.Answers may vary
Explanation
a. 1 – frog, 2 – snake, 3 – cricket, 4 – grass, 5 – soil bacteria b. Matter is recycled and energy flows one way, starting with input from the Sun
Cycling of matter: The matter recycles among the producer (grass), consumers (cricket, frog, and snake), and decomposers (soil bacteria). The grass uses molecules from the air and soil (carbon dioxide, water) to get the matter to make the sugar The cricket eats the grass, the frog eats the cricket, and the snake eats the frog. Each animal gets matter [carbon compounds] to make the molecules they need from their food. When all these organisms die, the soil bacteria (decomposers) break down the carbon compounds from the organisms’ bodies and so this matter becomes available for use by other organisms
Flow of energy: The grass (producer) absorbs energy from the Sun and stores this energy within sugars [complex carbon compounds]. When the cricket eats the grass, the frog eats the cricket, and the snake eats the frog, each animal gets energy for life processes by breaking down food molecules. The grass, the cricket, the frog, and the snake all release energy as heat. When all these organisms die, the soil bacteria (decomposers) break down the carbon compounds in the organisms’ bodies to get energy for life processes. The soil bacteria (decomposers) also release heat as they use energy. The heat is not available to organisms in the ecosystem to use again for energy. This is why continual energy input from the Sun is necessary for the organisms in the ecosystem to live
Constructed-Response Rubric
:Scoring Notes
:Possible answers include
a. 1 – frog, 2 – snake, 3 – cricket, 4 – grass, 5 – soil bacteria b. Matter is recycled and energy flows one way, starting with input from the Sun.
Cycling of matter: The matter recycles among the producer (grass), consumers (cricket, frog, and snake), and decomposers (soil bacteria). The grass uses molecules from the air and soil (carbon dioxide, water) to get the matter to make the sugar molecules. The cricket eats the grass, the frog eats the cricket, and the snake eats the frog. Each animal gets matter [carbon compounds] to make the molecules they need from their food. When all these organisms die, the soil bacteria (decomposers) break down the carbon compounds from the organisms’ bodies and so this matter becomes available for use by other organisms.
Flow of energy: The grass (producer) absorbs energy from the Sun and stores this energy within sugars [complex carbon compounds]. When the cricket eats the grass, the frog eats the cricket, and the snake eats the frog, each animal gets energy for life processes by breaking down food molecules. The grass, the cricket, the frog, and the snake all release energy as heat. When all these organisms die, the soil bacteria (decomposers) break down the carbon compounds in the organisms’ bodies to get energy for life processes. The soil bacteria (decomposers) also release heat as they use energy. The heat is not available to organisms in the ecosystem to use again for energy. This is why continual energy input from the Sun is necessary for the organisms in the ecosystem to live.
