How helpful traits become more common over many generations
Grade 7 Science Worksheet - Building Confidence
Circle the best answer.
Ari measures seeds from four plants in one wildflower patch. The sizes differ. Which step of natural selection does the chart show?
- Fitting: the plants changed to suit the patch
- Variation: the plants differ in seed size
- Selection: the biggest seeds are picked
- Inheritance: seeds copy the parent plant
Bo counts what two wildflower plants made. Each made many seeds, but few grew into plants. Which step does the chart show?
- Inheritance: seedlings copy the parent plant
- Fitting: the plants changed to suit the patch
- Variation: the seeds differ in size
- Too many young: more seeds than can grow
Esme grows seedlings from big-seeded and from small-seeded parents. The seedlings make seeds like their parents' seeds. Which step is this?
- Selection: the largest seeds are picked
- Inheritance: seeds pass on parent traits
- Sameness: the seedlings share one seed size
- Need: the seedlings grew big seeds to suit the patch
Jun reads the finch chart. What was the average beak depth of the medium ground finches before the 1977 drought?
- 10.2 mm
- 9.2 mm
- 9.0 mm
- 9.7 mm
Kira reads the finch chart. What was the average beak depth of the offspring born after the drought?
Use the picture in question 4.
- 9.2 mm
- 7.9 mm
- 9.7 mm
- 10.7 mm
Milo reads a science word list. Which meaning goes with the word variation?
- A change that is complete after one generation
- A change a body makes to fit its place
- A trait that helps a living thing where it lives
- Differences in a trait among living things of one kind
Noah reads a science word list. Which meaning goes with the word adaptation?
- A change a body makes when it needs something
- A difference seen between two kinds of living things
- An inherited trait that helps a living thing survive and have young
- A trait shared by the whole group, with no differences
Pia reads a science word list. Which meaning goes with the words natural selection?
- Each living thing changes its body to fit its place
- People choose which plants or animals have young
- A trait that shows up in the whole group at once
- Helpful inherited traits become more common over generations
Ren fills in the finch chart for the 1977 drought. Which answer goes in the cell with the question mark?
- Finches with deeper beaks
- Finches that needed deeper beaks
- Finches with shallower beaks
- Finches that grew deeper beaks
Tala fills in the peppered moth chart. Which answer goes in the cell with the question mark?
- light-colored
- half dark, half light
- dark-colored
- changing color to match