Food Chains and Food Webs 3rd Grade

Question 1 In this food chain, the arrows are used to show the flow of energy. The grasshopper gets its energy directly from the ---- Sun  Grass  Grasshopper  Frog   A. Grass B. Snake C. Frog D. Sun

Answer A. Grass

Question 2 Which statement correctly describes how energy flows in the food chain shown here?   Sun  Plant  Mosquito  Bird A. From plant to Sun B. From snake to mosquito C. From bird to plant D. From mosquito to bird

Answer D. From mosquito to bird

Question 3 The squirrel gets its energy directly from ----   Sun  Tree  Squirrel  Hawk A. the Sun B. the tree C. the other squirrels D. the hawk

Answer B. the tree

Question 4 The diagram shows an incomplete food chain. Which of the following would complete the food chain?   Sun  ________  Insects  Frogs  Snakes A. Small fish B. Mosquitos C. Green plants D. Bald eagles

Answer C. Green plants

Question 5 If the mice are removed from this food chain, which animal population would most likely be affected first?   Sun  Plant seeds  Field mouse  Snake  Mountain Lion A. Plant seeds B. Field mice C. Snakes D. Mountain lions

Answer C. Snakes

Question 6 Which of the following is represented in the food chain below?   Sun  Plants  Insects  Fish  Humans A. Evaporation of water B. Transfer of energy C. Reflection of light D. Changing of phase

Answer B. Transfer of energy

Question 7 What is most likely this first thing to result from having fewer field mice in the food chain pictured here?   Sun  Plant seeds  Field mouse  Snake  Eagle A. The snakes would have to find another food source. B. The plants that make seeds would decrease in number. C. The eagles would have to fly away to a different location. D. The new fish population will decrease.

Answer A. The snakes would have to find another food source.

Question 8 A new fish is introduced in a pond that also eats the plants. What changes would occur in this pond ecosystem? A. The large fish population will decrease B. The plant population will decrease. C. The small fish population will increase. D. The new fish population will decrease.

Answer B. The plant population will decrease.

Question 9 Which of the following correctly shows how energy moves through a food chain? A. Sun  meat eaters  plants  plant eaters B. Sun  plants  plant eaters  meat eaters C. Sun  plant eaters  meat eaters  plants D. Sun  plants  meat eaters  plant eaters

Answer B. Sun  plants  plant eaters  meat eaters

Question 10 Based on the food chain illustrated below, what effect would most likely be a direct result of increasing the number of fish?   Sun  Plant  Beetle Fish A. Beetles would have trouble finding food. B. There would be more kinds of plants. C. The population of beetles would decrease. D. Plants would no longer survive in this habitat.

Answer C. The population of beetles would decrease.

Question 11 Which of the following uses the Sun’s energy to grow? A. Plants B. Humans C. Birds D. Water

Answer A. Plants

Question 12 List two organisms that use the Sun’s energy to survive:   1. _____________________________ 2. _____________________________

Answer Any type of plant uses the Sun’s energy

Question 13 List two organisms eat other animals to survive: 1. _____________________________ 2. _____________________________

Answer Any type of meat eater gets its energy from other animals

Question 14 Use the following words to correctly fill in the food chain: grains, mouse, fox, and Sun. _______________  ______________  _______________  _______________

Answer Sun  grains  mouse  fox

Question 15 What is the original source of energy for all organisms in a pond ecosystem? A. Water B. Plants C. Animals D. Sun

Answer D. Sun

Question 16 Which food chain shows the correct flow of energy through a prairie ecosystem? A. Bird  Mouse  Plant  Sun B. Sun  Plant  Mouse  Bird C. Mouse  Plant  Sun  Bird D. Plant  Sun  Bird  Mouse

Answer

Question 17 A disease is causing plants not to grow in this habitat. How will this affect the food chain? The number of ----   Sun  Plant  Small fish  Large fish A. large fish will increase B. small fish will increase C. small fish will decrease D. sunlight will increase

Answer C. small fish will decrease

Question 18 A __________________ shows how energy moves through the environment. A. decomposer B. list C. graphic chart D. food chain

Answer D. food chain

Question 19 A model that shows how food chains overlap is called a _________________. A. food chain B. organism list C. food web D. predator

Answer C. food web

Question 20 An animal that hunts another animal for food is called a _______________________. A. prey B. consumer C. decomposer D. predator

Answer D. predator