Grade 6 Science Exam Worksheet (Age 11) — 70 Questions on Respiration, Circulation, Reproduction, Diseases, Food Chains & Properties of Matter

Instructions

Read each question carefully. For multiple-choice questions, circle the best answer. For fill-in-the-blank questions, use the words from the word bank provided. For all other questions, write your answers clearly in the space provided. Answer all 70 questions.

Part A: Objective Questions (30 Questions)

1. Which chamber of the heart is the strongest and pumps oxygen-rich blood to the entire body?
• a) Right Atrium
• b) Right Ventricle
• c) Left Atrium
• d) Left Ventricle
2. What is the main function of red blood cells?
• a) Fight infection
• b) Carry oxygen
• c) Help blood clot
• d) Digest nutrients
3. Gas exchange in the lungs takes place in tiny air sacs called:
• a) Bronchi
• b) The trachea
• c) Alveoli
• d) The diaphragm
4. The large tube that carries air from your throat to your lungs is the:
• a) Esophagus
• b) Trachea
• c) Artery
• d) Ureter
5. The male reproductive cell is known as the:
• a) Ovum
• b) Zygote
• c) Sperm
• d) Embryo
6. The joining of a male and female reproductive cell is called:
• a) Respiration
• b) Circulation
• c) Menstruation
• d) Fertilization
7. Which of the following is a communicable disease?
• a) Asthma
• b) Diabetes
• c) The common cold
• d) Heart disease
8. A disease-causing organism, like a virus or fungus, is called a:
• a) Pathogen
• b) Antibody
• c) Vaccine
• d) Decomposer
9. Which is the most effective way to prevent the spread of germs from your hands?
• a) Wearing gloves all day
• b) Wiping them on your pants
• c) Washing them with soap and water
• d) Using hand sanitizer once a day
10. In any food chain, organisms like plants that make their own food are called:
• a) Consumers
• b) Decomposers
• c) Producers
• d) Predators
11. An animal that only eats other animals is a:
• a) Herbivore
• b) Carnivore
• c) Producer
• d) Decomposer
12. What do the arrows in a food chain or food web represent?
• a) The direction of animal movement
• b) Who eats whom
• c) The flow of energy
• d) The life cycle of an animal
13. Which state of matter has particles that are tightly packed and vibrate in a fixed position?
• a) Gas
• b) Liquid
• c) Plasma
• d) Solid
14. A material that does NOT allow heat or electricity to pass through it easily is called an:
• a) Insulator
• b) Conductor
• c) Element
• d) Alloy
15. Which of the following is an example of a chemical change?
• a) Melting an ice cube
• b) Tearing a piece of paper
• c) Burning a log of wood
• d) Boiling water

16. The tiniest blood vessels that connect arteries to veins are the ____________________.
17. Blood vessels that carry blood back towards the heart are called ____________________.
18. Humans inhale ____________________ from the atmosphere, which is essential for respiration.
19. Strep throat is a common illness caused by harmful ____________________.
20. A ____________________ is a shot that helps your body learn to fight off a specific pathogen.
21. A rabbit that eats grass is an example of a(n) ____________________.
22. Fungi and worms that break down dead plants and animals are known as ____________________.
23. A puddle of water shrinking on a hot day is an example of ____________________.
24. Because it allows electricity to flow through it easily, copper is a good electrical ____________________.
25. Cutting an apple into slices is a ____________________ change.

26. ____ Arteries always carry blood away from the heart.
27. ____ The main purpose of the reproductive system is to create new life.
28. ____ Non-communicable diseases like allergies can be spread from person to person.
29. ____ Styrofoam is a good thermal conductor.
30. ____ When iron rusts, a new substance is formed.

Part B: Subjective Questions (40 Questions)

31. What is the main purpose of the circulatory system?
32. What is the main difference between an artery and a vein in terms of blood flow direction?
33. What is the diaphragm and what role does it play in breathing?
34. What two main gases are exchanged between the alveoli and the capillaries in the lungs?
35. Why is the heart considered a muscle?
36. What is a pulse, and what does it measure?
37. What is the function of the ovaries in the female reproductive system?
38. What is the function of the testes in the male reproductive system?
39. Define "communicable disease."
40. Give one example of a non-communicable disease.
41. List two different ways you can prevent the spread of germs and disease.
42. What is an antibody?
43. In a food chain, what is a "producer"?
44. In a food chain, what is a "consumer"?
45. What is the primary source of all energy in most ecosystems on Earth?
46. What is the key difference between a food chain and a food web?
47. Describe the arrangement and movement of particles in a liquid.
48. What is meant by the "boiling point" of a substance?
49. Give one clear example of a physical change.
50. Give one clear example of a chemical change.

Diagram 1: The Human Heart

Imagine a simplified drawing of the human heart, divided into four chambers.

• Chamber A is the Top-Right chamber.
• Chamber B is the Bottom-Right chamber.
• Chamber C is the Top-Left chamber.
• Chamber D is the Bottom-Left chamber.

51. Which letter (A, B, C, or D) represents the Right Atrium, which receives oxygen-poor blood from the body?
52. Which letter (A, B, C, or D) represents the Left Atrium, which receives oxygen-rich blood from the lungs?
53. Which letter (A, B, C, or D) represents the Right Ventricle, which pumps oxygen-poor blood to the lungs?
54. Which letter (A, B, C, or D) represents the Left Ventricle, which pumps oxygen-rich blood to the body?
55. What is the name of the muscular wall that separates the right side (A & B) from the left side (C & D)?

Diagram 2: A Simple Food Web

Consider the following relationships in an ecosystem:

• Grass is eaten by Grasshoppers and Rabbits.
• Grasshoppers are eaten by Frogs.
• Rabbits are eaten by Hawks.
• Frogs are eaten by Snakes.
• Snakes are eaten by Hawks.

56. Identify the producer in this food web.
57. Name two primary consumers (herbivores).
58. Name one secondary consumer.
59. If a disease wiped out most of the rabbit population, what would likely happen to the hawk population?
60. What organism is at the top of this food web (the apex predator)?

61. Describe the full journey of a single red blood cell, starting from the time it enters the right atrium with oxygen-poor blood until it returns to the right atrium again. Mention the four heart chambers, the lungs, and the body.
62. Explain in detail how the respiratory system (breathing) and the circulatory system (blood flow) work together to deliver oxygen to a muscle cell in your leg.
63. Why do your heart rate and breathing rate increase significantly when you run or play sports?
64. Imagine your classmate sitting next to you has a bad cold and is coughing and sneezing. Describe three distinct and practical actions you can take to reduce your chances of getting sick.
65. Explain the difference between a communicable disease and a non-communicable disease. Provide a clear example for each type and explain why it fits that category.
66. Draw (or describe in words) a simple food chain that might exist in a pond. Your food chain must have four levels. Label the producer, primary consumer, secondary consumer, and tertiary consumer.
67. In a forest food web, wolves prey on deer, and deer feed on young trees and shrubs. If a new disease suddenly kills most of the wolves, what two things are likely to happen to the deer population and the young tree population over the next few years? Explain your reasoning.
68. You are making soup. You place a metal spoon and a wooden spoon into the hot pot. After one minute, the handle of the metal spoon is very hot, but the wooden spoon's handle is not. Explain this difference using the scientific terms "thermal conductor" and "thermal insulator".
69. Explain the difference between boiling and evaporation. Both involve a liquid turning into a gas. What makes them different?
70. You are conducting a science experiment. You mix a clear liquid with a white powder. You observe three things: the mixture starts bubbling and fizzing, the beaker gets cold, and the mixture changes color. Is this a physical or chemical change? Explain why, referencing your observations.

Answer Key

Part A: Objective Questions

1. d) Left Ventricle
2. b) Carry oxygen
3. c) Alveoli
4. b) Trachea
5. c) Sperm
6. d) Fertilization
7. c) The common cold
8. a) Pathogen
9. c) Washing them with soap and water
10. c) Producers
11. b) Carnivore
12. c) The flow of energy
13. d) Solid
14. a) Insulator
15. c) Burning a log of wood
16. Capillaries
17. Veins
18. Oxygen
19. Bacteria
20. Vaccine
21. Herbivore
22. Decomposers
23. Evaporation
24. Conductor
25. Physical
26. T
27. T
28. F
29. F
30. T

Part B: Subjective Questions

31. The main purpose of the circulatory system is to transport blood, oxygen, nutrients, and waste throughout the body.
32. Arteries carry blood away from the heart, while veins carry blood toward the heart.
33. The diaphragm is a large muscle below the lungs that contracts and relaxes to cause inhalation and exhalation.
34. Oxygen (O2) and Carbon Dioxide (CO2) are exchanged.
35. The heart is a muscle because it is made of special cardiac muscle tissue that contracts and relaxes to pump blood.
36. A pulse is the rhythmic expansion of arteries as blood is pumped through them by the heart. It measures the heart rate.
37. The ovaries produce and store female reproductive cells (eggs/ova) and produce female hormones.
38. The testes produce male reproductive cells (sperm) and produce male hormones.
39. A communicable disease is an illness that can be spread from one person or organism to another.
40. Examples: Diabetes, asthma, heart disease, most cancers.
41. Washing hands with soap and water; covering your mouth and nose when you cough or sneeze. (Other answers possible)
42. An antibody is a protein produced by the immune system to identify and neutralize foreign objects like bacteria and viruses.
43. A producer is an organism, usually a plant, that produces its own food through photosynthesis.
44. A consumer is an organism that gets its energy by eating other organisms.
45. The primary source of energy is the Sun.
46. A food chain shows a single path of energy flow, while a food web shows many interconnected food chains in an ecosystem.
47. In a liquid, particles are close together but can slide past one another, allowing the liquid to flow and take the shape of its container.
48. The boiling point is the specific temperature at which a liquid turns into a gas throughout the bulk of the liquid.
49. Examples: Tearing paper, melting ice, chopping wood, dissolving sugar in water.
50. Examples: Burning wood, rusting iron, baking a cake, digesting food.
51. A (Right Atrium)
52. C (Left Atrium)
53. B (Right Ventricle)
54. D (Left Ventricle)
55. Septum
56. Grass
57. Grasshopper and Rabbit
58. Frog, Snake, or Hawk (any one)
59. The hawk population would likely decrease due to having less food available.
60. The Hawk
61. The red blood cell enters the right atrium (oxygen-poor), goes to the right ventricle, is pumped to the lungs where it picks up oxygen, returns to the left atrium (oxygen-rich), goes to the left ventricle, is pumped to the body cells where it drops off oxygen, and then returns to the right atrium.
62. The respiratory system brings oxygen into the body via the lungs. In the alveoli, this oxygen passes into the blood. The circulatory system's heart then pumps this oxygen-rich blood through arteries to all body cells, including a muscle cell in the leg, where the oxygen is delivered.
63. When you exercise, your muscles need more oxygen and produce more waste (carbon dioxide). Your breathing rate increases to get more oxygen in and CO2 out. Your heart rate increases to pump the oxygen-rich blood to your muscles faster.
64. (Sample answers) 1. Avoid touching my face (eyes, nose, mouth). 2. Wash my hands frequently with soap and water. 3. Politely ask them to cover their mouth when they cough or try to keep a bit of distance.
65. A communicable disease can be spread between people (e.g., the flu, which is caused by a virus). A non-communicable disease cannot be spread between people and is often caused by genetics, lifestyle, or environmental factors (e.g., diabetes).
66. (Sample answer) Pond food chain: Algae (Producer) -> Tadpole (Primary Consumer) -> Small Fish (Secondary Consumer) -> Heron (Tertiary Consumer).
67. If the wolf population dies, the deer population will likely increase significantly because their main predator is gone. This increase in deer will lead to a decrease in the young tree population because the deer will eat more of them.
68. The metal spoon is a good thermal conductor, meaning it allows heat to travel through it easily from the hot soup to the handle. The wooden spoon is a thermal insulator, which means it resists the flow of heat, so its handle stays cool.
69. Evaporation is a slow process that happens only at the surface of a liquid at any temperature. Boiling is a rapid process that happens throughout the entire liquid at a specific, high temperature (the boiling point).
70. This is a chemical change. The evidence is: 1) production of a gas (fizzing), 2) a temperature change (getting cold), and 3) a color change/formation of a new substance (precipitate). These are all indicators that a new substance with different properties has been formed.