What makes a population grow or shrink

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Ari reads a graph of sunflower plants in a field with plenty of room. How many sunflower plants grew in the field in year 3?

   • 3 plants
   • 40 plants
   • 20 plants
   • 80 plants
2. 2.

   Bo reads a graph of duckweed floating on a pond. What percent of the pond surface did the duckweed cover in year 4?

   • 4 percent
   • 80 percent
   • 25 percent
   • 50 percent
3. 3.

   Esme reads a graph from a park where nest boxes were added in year 3. How many bluebird pairs nested in year 4?

   • 10 pairs
   • 4 pairs
   • 12 pairs
   • 6 pairs
4. 4.

   Jun's class grows beans in one small box with plenty of sun and water. The line levels off at 30 plants and the leaves touch. Which resource ran short?

   • The number of weeks
   • Nesting spots
   • Space to grow
   • Shelter from rain
5. 5.

   Milo looks at the line for duckweed on a pond. Which sentence describes the shape of the line?

   • It starts flat, then falls steadily
   • It rises at one steady speed
   • It keeps speeding up with no end
   • It speeds up, then slows and levels off
6. 6.

   A garden bed has plenty of room. Noah reads the line for bean plants. Which sentence describes how the count grows?

   • It stays the same, then falls
   • It grows faster each week
   • It levels off after the first week
   • It grows by the same amount each week
7. 7.

   Pia compares two sunflower fields. Which field's line shows that resources are starting to run short?

   • Field A: its line keeps rising
   • Both: the lines start the same
   • Field A: its line reaches the top
   • Field B: its line levels off
8. 8.

   Ren reads that duckweed covers 90 percent of the pond in years 5, 6 and 7. What does the flat part of the line show?

   • The count was skipped those years
   • The pond is growing faster now
   • No new plants are being made
   • Plants added are about equal to plants lost
9. 9.

   The line for bluebird pairs is flat in years 4, 5 and 6. Tala says nothing happens in those years. What is right?

   • The pairs moved to a new park
   • The nest boxes were taken away
   • No young are raised in those years
   • Young are still raised, but the count stays steady
10. 10.

    Zee sees the sunflower line flat at 120 plants in years 3 to 6. What is true about the number of plants in those years?

    • It keeps rising a little each year
    • No new plants sprout in those years
    • It stays about the same from year to year
    • It is 3 plants, then 4, 5 and 6