One parent or two: how living things reproduce

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   A strawberry plant sends out a runner, a stem along the ground that grows a new plant. Ari fills in the Offspring box. What goes in it?

   • A mix of genes set P and genes set Q
   • Half of genes set P, with half missing
   • Genes set P, the same as the one parent
   • New genes that are different from set P
2. 2.

   Yeast is a living thing made of one cell. A yeast cell grows a bud that breaks away as a new cell. Bo fills in the Offspring box. What goes in it?

   • Genes set Y, copied from the parent cell
   • Different genes from the parent cell
   • Part of genes set Y, split with the parent cell
   • Genes set Y and set Z from two parent cells
3. 3.

   A hydra is an animal. It grows a bud that becomes a new hydra and breaks away. Esme fills in the Offspring box. What goes in it?

   • Genes set H and set J from two parents
   • New genes that differ from the parent
   • Genes taken in from the water nearby
   • Genes set H, matching the one parent
4. 4.

   Kira reads a science word list. Which meaning goes with the words sexual reproduction?

   • Egg and sperm cells from two parents join
   • A seed lands in soil and begins to grow
   • Egg cells from two parents join with no sperm cells
   • One parent makes a copy of itself
5. 5.

   Luz reads a science word list. Which meaning goes with the word variation?

   • The number of offspring a parent makes
   • Differences in genes and traits among offspring
   • Sameness that protects offspring when the weather changes
   • Offspring that are copies of one parent
6. 6.

   Milo reads two cases. Which case shows sexual reproduction?

   • Case Y, because two parents give sperm and egg cells
   • Case X, because the runner needs a partner plant nearby
   • Case X, because the new plant is a copy of its parent
   • Case Y, because the new plant grows from a runner
7. 7.

   Pia reads two cases. Which case gives offspring more likely to include some that cope with a change in the weather?

   • Case Y, because it makes offspring much faster
   • Case Y, because its offspring have varied genes
   • Case X, because copies of one parent suit any weather
   • Case X, because a bud is a new and different cell
8. 8.

   Ren studies a flower with bright petals and a sweet scent. What job do these parts do for the flower?

   • They make the seeds heavier before they fall
   • They draw pollinators such as bees to the flower
   • They hook onto an animal’s coat so seeds travel
   • They keep pollinators away from the pollen and nectar
9. 9.

   Tala reads about a cocklebur seed pod with hooks that cling to an animal’s coat. What job do the hooks do for the plant?

   • They hold the egg cell inside the flower
   • They make nectar for pollinators to drink
   • They draw bees that carry pollen from flower to flower
   • They carry seeds to a new place on an animal’s coat
10. 10.

    Zee listens to a bird sing in spring. What job does bird song do for reproduction?

    • It helps attract a partner of the same species
    • It carries pollen from flower to flower
    • It holds the eggs and keeps the young birds warm
    • It tells the plants in the garden when to bloom