Class 6 Science worksheet on Assertion-Reasoning and Case-Based MCQs

 

Assertion-Reasoning and Case-Based MCQs
Class 6 Science - 50 Practice Questions

Instructions: For Assertion-Reasoning type questions, two statements are given - one labelled Assertion (A) and the other labelled Reason (R). Choose the correct option:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Assertion-Reasoning MCQs (1 to 25):

  1. A: Multicellular organisms work more efficiently than unicellular organisms.
    R: In multicellular organisms, there is division of labour.

  2. A: Amoeba can change its shape.
    R: It helps it to engulf its food and in locomotion.

  3. A: Oxygen is an end product of photosynthesis.
    R: Photosynthesis helps plants to respire.

  4. A: Safranin is used to stain cells.
    R: Safranin makes the cells look pretty.

  5. A: Mimosa plant dies when touched.
    R: Mimosa plant is sensitive to touch.

  6. A: Plants are autotrophs.
    R: They prepare their own food using sunlight, water, and carbon dioxide.

  7. A: Blood flows only in arteries.
    R: Arteries carry oxygen-rich blood from the heart to the rest of the body.

  8. A: The heart is an involuntary organ.
    R: It works continuously without our control.

  9. A: Leaves are called the kitchen of the plant.
    R: Photosynthesis takes place in leaves.

  10. A: Animals depend on plants for food.
    R: Plants can make their own food; animals cannot.

  11. A: Air is a mixture of gases.
    R: Air contains oxygen, nitrogen, carbon dioxide, and other gases.

  12. A: Stomata are found in the roots.
    R: Roots absorb water from the soil.

  13. A: Water is necessary for germination.
    R: It activates enzymes that start growth in seeds.

  14. A: All green plants need light to grow.
    R: Light is required for photosynthesis.

  15. A: The human skeleton protects internal organs.
    R: The skull protects the brain.

  16. A: Bones are soft and flexible.
    R: Bones are made up of cartilage only.

  17. A: Soil contains living organisms.
    R: Earthworms and microbes live in soil.

  18. A: Evaporation helps in the water cycle.
    R: Water vapour forms clouds.

  19. A: Water boils at 100°C.
    R: Boiling point of water at sea level is 100°C.

  20. A: Shadows are formed when light passes through an object.
    R: Opaque objects allow no light to pass through them.

  21. A: Sound cannot travel through a vacuum.
    R: Sound needs a medium to travel.

  22. A: The moon produces its own light.
    R: The moon reflects sunlight.

  23. A: Plants grow towards sunlight.
    R: This movement is known as phototropism.

  24. A: Iron nails rust when exposed to water and air.
    R: Rusting is a chemical change.

  25. A: Transparent objects do not form shadows.
    R: They allow all light to pass through.

Case-Based MCQs (26 to 50):

Case 1: It has been raining for days and Rashmi notices her plants are drooping.

  1. Organisms that depend on the sun for their food:
    a. Saprotrophs
    b. Producers
    c. Consumers
    d. Parasites

  2. The pigment in leaves that helps in photosynthesis:
    a. Chlorophyll
    b. Mitochondria
    c. Xylem
    d. Phloem

  3. Rashmi should move the plant to a:
    a. Dark room
    b. Sunny spot
    c. Refrigerator
    d. Water tank

  4. Plants need sunlight to:
    a. Grow flowers
    b. Make food
    c. Attract insects
    d. Shed leaves

  5. The energy for photosynthesis comes from:
    a. Soil
    b. Sunlight
    c. Moonlight
    d. Water

Case 2: Ravi touches a hot utensil and quickly pulls back his hand.

  1. This action is called a:
    a. Voluntary action
    b. Reflex action
    c. Habituation
    d. Involuntary action

  2. This action is controlled by:
    a. Spinal cord
    b. Brain
    c. Heart
    d. Kidneys

  3. Which sense organ helped Ravi detect heat?
    a. Nose
    b. Eyes
    c. Skin
    d. Tongue

  4. The reaction time in a reflex is:
    a. Slow
    b. Fast
    c. Delayed
    d. Not needed

  5. Reflex actions help in:
    a. Movement
    b. Growth
    c. Safety
    d. Digestion

Case 3: A group of students observe different shadows formed at different times of the day.

  1. Shadows are longest during:
    a. Noon
    b. Morning and evening
    c. Midnight
    d. Afternoon

  2. The shape of a shadow depends on the:
    a. Colour of the object
    b. Position of the object
    c. Sound of the object
    d. Smell of the object

  3. A transparent object forms:
    a. A clear shadow
    b. No shadow
    c. A dark shadow
    d. A thick shadow

  4. The sun appears to change position because of:
    a. Earth’s rotation
    b. Sun’s movement
    c. Moon’s orbit
    d. Wind direction

  5. Shadows always form on the:
    a. Opposite side of light
    b. Same side as light
    c. Above the object
    d. None of these

Case 4: Riya places a magnet near iron nails and notices some are attracted.

  1. The property observed is:
    a. Magnetism
    b. Reflection
    c. Absorption
    d. Refraction

  2. Magnets attract:
    a. Plastic
    b. Wood
    c. Iron
    d. Glass

  3. The ends of a magnet are called:
    a. Poles
    b. Tips
    c. Sides
    d. Corners

  4. When two north poles are brought together:
    a. Attract
    b. Repel
    c. Break
    d. Join

  5. Magnets are used in:
    a. Pens
    b. Switches
    c. Compasses
    d. Paints

Case 5: An experiment is conducted to check the solubility of different substances in water.

  1. Sugar dissolves in water. It is a:
    a. Soluble substance
    b. Insoluble substance
    c. Suspended matter
    d. Filter

  2. Chalk powder in water is:
    a. Soluble
    b. Transparent
    c. Insoluble
    d. Sweet

  3. To remove insoluble substances we use:
    a. Evaporation
    b. Filtration
    c. Condensation
    d. Freezing

  4. Mixtures can be separated by:
    a. Mixing again
    b. Heating
    c. Different methods
    d. None

  5. A mixture of sand and salt can be separated by:
    a. Sieving and filtration
    b. Boiling only
    c. Using magnets
    d. Melting


ANSWERS 

✅ Assertion-Reasoning MCQs (1 to 25):

  1. (a)

  2. (a)

  3. (c)

  4. (c)

  5. (d)

  6. (a)

  7. (c)

  8. (a)

  9. (a)

  10. (a)

  11. (a)

  12. (d)

  13. (a)

  14. (a)

  15. (a)

  16. (d)

  17. (a)

  18. (a)

  19. (a)

  20. (a)

  21. (a)

  22. (d)

  23. (a)

  24. (a)

  25. (a)

✅ Case-Based MCQs (26 to 50):

Case 1:

  1. (b) Producers

  2. (a) Chlorophyll

  3. (b) Sunny spot

  4. (b) Make food

  5. (b) Sunlight

Case 2:

  1. (b) Reflex action

  2. (a) Spinal cord

  3. (c) Skin

  4. (b) Fast

  5. (c) Safety

Case 3:

  1. (b) Morning and evening

  2. (b) Position of the object

  3. (b) No shadow

  4. (a) Earth’s rotation

  5. (a) Opposite side of light

Case 4:

  1. (a) Magnetism

  2. (c) Iron

  3. (a) Poles

  4. (b) Repel

  5. (c) Compasses

Case 5:

  1. (a) Soluble substance

  2. (c) Insoluble

  3. (b) Filtration

  4. (c) Different methods

  5. (a) Sieving and filtration



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