Match Structures to Functions - 4th Grade Science

1. What is the main function of a plant's stem?

   Support the plant and transport water and nutrients. The stem acts as the plant's highway system and structural support.

2. What is the function of fruit on a flowering plant?

   Protect seeds and help spread them. Fruits develop from flowers after pollination.

3. What is the function of a flower in most plants?

   Reproduction by making seeds. Flowers contain reproductive organs that produce seeds.

4. Which external structure is best matched to the function of flying: wings, hooves, or scales?

   Wings. Wing shape creates lift when air flows over them.

5. What is the function of gills in many fish and aquatic animals?

   Take oxygen from water and release carbon dioxide. Water flows over gills, allowing gas exchange.

6. What is the main function of a leaf?

   Make food for the plant using photosynthesis. Leaves contain chlorophyll to convert sunlight into glucose.

7. What is the function of xylem in a plant?

   Carry water and minerals from roots to the rest of the plant. These tube-like vessels transport water upward through the plant.

8. What is the main function of gills in a fish?

   Take in oxygen from water and release carbon dioxide. Fish extract dissolved oxygen as water flows over gill filaments.

9. What is the function of a flower in a flowering plant?

   Reproduction by making seeds (often after pollination). Flowers contain male and female parts for sexual reproduction.

10. What is the main function of a bird's beak?

    Gather and eat food (shape helps with the diet). Beak shape matches food type: curved for meat, flat for seeds.

11. What is the function of an animal skeleton (bones)?

    Support the body, protect organs, and help movement. Bones form a framework that muscles pull against.

12. What is the function of a seed for a plant?

    Contain an embryo and stored food to grow a new plant. Seeds can survive harsh conditions until ready to germinate.

13. Identify the best match: Feathers are an external structure mainly used for what function?

    Flight and insulation (keeping warm). Feathers enable birds to fly and trap air for warmth.

14. What is the main function of an animal's skeleton (bones)?

    Support the body, protect organs, and help movement. Bones form framework and shield vital organs.

15. Which external structure is best matched to the function of swimming: fins, claws, or feathers?

    Fins. Fins push against water to propel the body forward.

16. What is the function of seeds in a plant life cycle?

    Grow into a new plant when conditions are right. Seeds contain embryos that germinate when moisture and temperature are suitable.

17. What is the function of the heart in an animal?

    Pump blood to move oxygen and nutrients through the body. Heart muscles contract rhythmically to circulate blood.

18. What is the function of stomata on leaves?

    Allow gas exchange and release water vapor. These tiny pores open and close to control gas and water movement.

19. Which structure helps an owl hunt at night: large eyes or hooves?

    Large eyes. Enhanced vision gathers more light in darkness.

20. Which external animal structure is primarily used for protection: fur, shell, or tongue?

    Shell. Hard shells shield soft bodies from predators and damage.

21. What is the main function of the heart in an animal?

    Pump blood to move oxygen and nutrients through the body. This muscular organ contracts rhythmically to circulate blood.

22. Which external structure helps a fish move through water: fins or fur?

    Fins. Flat surfaces push water for swimming.

23. What is the function of phloem in a plant?

    Carry sugars (food) from leaves to other parts of the plant. These vessels transport food made in leaves to all plant parts.

24. What is the function of lungs in many animals?

    Exchange gases: take in oxygen and release carbon dioxide. Air sacs in lungs allow oxygen to enter blood.

25. What is the main function of a plant root system?

    Absorb water and minerals and anchor the plant in soil. Roots have tiny hairs that increase surface area for absorption.

26. What is the main function of lungs in a land animal?

    Take in oxygen from air and release carbon dioxide. Air sacs in lungs exchange gases between air and blood.

27. What is the function of thorns or spines on some plants?

    Protect the plant from animals that might eat it. Sharp structures discourage herbivores.

28. What is the function of muscles in an animal body?

    Contract to move body parts and help the body work. Muscles work in pairs to pull bones and create movement.

29. What is the main function of the stomach in digestion?

    Break down food using acids and mixing. Churning and acid begin digestion process.

30. What is the main function of a plant's roots?

    Absorb water and minerals and anchor the plant. Roots extend underground to access soil resources and stabilize the plant.

31. What is the function of the skeleton (bones) in most animals?

    Support the body, protect organs, and allow movement. Bones form a framework that muscles pull against.

32. What is the function of a flower on a plant?

    Help the plant reproduce by making seeds. Flowers contain reproductive organs for seed production.

33. What is the function of flat teeth (molars) in many animals?

    Grind and crush food, often plants. Broad surfaces crush tough plant material.

34. Which external structure helps many animals move from place to place?

    Legs (or other limbs) used for movement. Limbs provide locomotion through walking, running, swimming, or flying.

35. What is the function of leaves in most plants?

    Make food using sunlight (photosynthesis). Leaves contain chlorophyll to capture sunlight.

36. What is the function of a plant stem?

    Support the plant and transport water, minerals, and sugars. Stems contain vascular tissues (xylem and phloem) for transport.

37. What is the function of chlorophyll in plant leaves?

    Capture sunlight energy for photosynthesis. This green pigment absorbs light energy needed for making food.

38. Which plant structure takes in carbon dioxide and releases oxygen and water vapor?

    Stomata. These tiny pores open and close to control gas exchange.

39. Which structure is best for grabbing and tearing meat: flat molars or sharp canines?

    Sharp canines. Pointed teeth pierce and rip flesh easily.

40. What is the main function of the stomach in an animal?

    Break down food during digestion. Acids and enzymes chemically break down food into nutrients.

41. What is the function of sharp teeth (canines) in many animals?

    Tear meat and help catch prey. Pointed teeth pierce and hold struggling prey.

42. What is the main function of the lungs in many animals?

    Take in oxygen and remove carbon dioxide. Gas exchange occurs in tiny air sacs.

43. What is the function of fruit on a plant?

    Protect seeds and help spread them. Fruits develop from flowers to aid in seed dispersal.

44. What is the main function of the intestines in an animal?

    Absorb nutrients and water and move waste through the body. Villi in intestines increase surface area for absorption.

45. What is the function of muscles in an animal's body?

    Pull on bones to create movement. Muscles contract and relax to move body parts.

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