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?

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

   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?

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

   • Food for the pairs
   • Drinking water
   • Nesting spots
   • The calendar year
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
   • Space
   • The number of years
   • Water
5. 5.

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

   • It keeps speeding up with no end
   • It starts flat, then falls steadily
   • It rises at one steady speed
   • 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 levels off after the first week
   • It grows faster each week
   • It stays the same, then falls
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 B: its line levels off
   • Field A: its line reaches the top
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 pond is growing faster now
   • Plants added are about equal to plants lost
   • The count was skipped those years
   • No new plants are being made
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 pairs moved to a new park
   • Young are still raised, but the count stays steady
   • The nest boxes were taken away
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 is 3 plants, then 4, 5 and 6
    • It keeps rising a little each year
    • It stays about the same from year to year
    • No new plants sprout in those years