Structures for Survival

Grade 4 Science Worksheet

Circle the answer.

1. 1.

   Why do the heart and blood vessels work together?

   • the heart pumps blood through the vessels to every part
   • the vessels take in air for the heart
   • the vessels pump blood into the heart only
   • the heart breaks down food in the vessels
2. 2.

   A rose has sharp thorns on its stem. Which claim do the thorns support?

   • thorns help keep animals from eating the stem
   • thorns help the rose make food
   • thorns help bees find the flower
   • thorns help the rose take in water
3. 3.

   How do a duck's webbed feet help it?

   • they push water so the duck can swim
   • they help the duck grab branches
   • they help the duck dig for worms
   • they keep the duck warm in snow
4. 4.

   A student says, "A rabbit's big ears are only for looks." Which evidence argues against this?

   • rabbits have ears of different colors
   • baby rabbits have shorter ears
   • rabbit ears are soft and furry
   • rabbits turn their ears toward sounds and then run
5. 5.

   Which observation is evidence that roots hold a plant in place?

   • a weed grows small yellow flowers
   • a weed with long roots is hard to pull up
   • a weed has green leaves
   • a weed grows fast after rain