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?

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

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

   • 12 pairs
   • 6 pairs
   • 10 pairs
   • 4 pairs
3. 3.

   The park has 8 nest boxes, plenty of water and plenty of food. Kira sees the line level off at 8 pairs. Which resource ran short?

   • Nesting spots
   • Drinking water
   • The calendar year
   • Food for the pairs
4. 4.

   Luz sees the sunflower line fall in year 4, a dry year. The field is big and sunny. Which resource ran short?

   • Sunlight
   • The number of years
   • Water
   • Space
5. 5.

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

   • It rises at one steady speed
   • It keeps speeding up with no end
   • It starts flat, then falls steadily
   • 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 grows by the same amount each week
   • It stays the same, then falls
   • It grows faster each week
   • It levels off after the first week
7. 7.

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

   • Field A: its line reaches the top
   • Both: the lines start the same
   • Field B: its line levels off
   • Field A: its line keeps rising
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
   • No new plants are being made
   • The pond is growing faster now
   • 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?

   • No young are raised in those years
   • The nest boxes were taken away
   • Young are still raised, but the count stays steady
   • The pairs moved to a new park
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
    • It stays about the same from year to year
    • It is 3 plants, then 4, 5 and 6
    • No new plants sprout in those years