CLASS 6

   QUESTION ANSWER

Here are the answers and diagrams required for your queries:

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E. Differentiate Between:

1. Homogeneous mixture and Heterogeneous mixture

   Homogeneous Mixture	Heterogeneous Mixture
   Components are uniformly distributed throughout.	Components are not uniformly distributed.
   It has a single-phase appearance.	It has two or more phases.
   Example: Saltwater	Example: Oil and water

2. Parallel venation and Reticulate venation

   Parallel Venation	Reticulate Venation
   Veins run parallel to each other.	Veins form a network-like structure.
   Found in monocot plants.	Found in dicot plants.
   Example: Grass	Example: Mango leaf

3. Herbs and Trees

   Herbs	Trees
   Small plants with soft stems.	Large plants with a woody trunk.
   Lifespan is short (usually one season).	Lifespan is long (several years).
   Example: Mint	Example: Neem

4. Autotrophs and Heterotrophs

   Autotrophs	Heterotrophs
   Can prepare their own food using sunlight or chemicals.	Depend on other organisms for food.
   Perform photosynthesis or chemosynthesis.	Do not perform photosynthesis.
   Example: Green plants	Example: Humans, animals

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F. Answer the following questions:

1. What is the importance of water and roughage in our diet?

   • Water: Helps maintain body temperature, supports digestion, flushes out toxins, and ensures the proper functioning of cells and organs.
   • Roughage (Dietary fiber): Aids digestion by adding bulk to stool, preventing constipation, and maintaining gut health.

2. Explain the process of sedimentation and decantation with the help of a diagram:

   • Sedimentation: The process of settling down of heavier, insoluble particles in a liquid when left undisturbed.
   • Decantation: The process of gently pouring the liquid from the top, leaving the sediment behind.
     (Diagram provided in the next section)

3. Give a tabular account of minerals required by our body and their importance:

   Mineral	Importance
   Calcium	Strengthens bones and teeth
   Iron	Essential for hemoglobin formation
   Potassium	Regulates muscle function and fluid balance
   Iodine	Supports thyroid hormone production
   Zinc	Aids in immune system functioning

4. Define excretion. What is the importance of this process?

   • Definition: Excretion is the process by which living organisms remove metabolic waste products from their body.
   • Importance: Maintains homeostasis, prevents accumulation of harmful substances, and regulates water and salt balance.

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G. Well-Labelled Diagrams:

a. A flower
b. A distillation apparatus
c. Ribcage

Would you like me to generate these diagrams for you?

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A. Choose the correct option:

1. Animals of polar regions have a thick layer of _______ under their skin.
   b. fat

2. A body moving in a straight path exhibits which motion?
   c. Translational

3. The SI unit of current is
   a. ampere

4. Which of the following is an example of periodic motion?
   d. A moving swing

5. Which of the following materials can be magnetised?
   d. Iron

6. The source of current in an electric circuit is
   b. battery

7. Plants cannot utilise which component of air directly?
   d. Nitrogen

8. Pick the odd one out.
   b. Plastic

9. Which of the following is a non-luminous object?
   c. Table

10. Which of the following is not a system of standard units?
    b. HWL

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B. Give reasons for the following:

1. Motion of football players in a game is an example of random motion.
   Reason:
   The motion of football players is random because they move in unpredictable directions and speeds based on the dynamics of the game, without a fixed or repetitive pattern.

B. Give reasons for the following:

2. One should not touch electrical appliances and switches with wet hands.
   Reason:
   Water is a good conductor of electricity. Wet hands can increase the risk of electrical shock as electricity can pass through the water on the skin.

3. Birds have hollow bones.
   Reason:
   Hollow bones make the skeleton lightweight, enabling birds to fly easily while maintaining structural strength.

4. A freely suspended magnet always points in N-S direction.
   Reason:
   A magnet aligns itself with the Earth's magnetic field, where the North pole of the magnet points toward the Earth's magnetic North and the South pole points to the Earth's magnetic South.

5. Electrical fires must never be extinguished using water.
   Reason:
   Water is a conductor of electricity and can increase the spread of the current, posing a greater risk of electric shock or further fire hazards.

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C. Define the following terms:

1. Compost:
   Organic matter decomposed by microorganisms, used as a natural fertilizer to enrich soil.

2. Motion:
   The change in the position of an object with respect to time and its reference point.

3. Reflection:
   The bouncing back of light rays when they hit a smooth surface, such as a mirror.

4. Oscillation:
   A repetitive motion of an object about a fixed point or mean position, such as the swing of a pendulum.

5. Circuit:
   A closed loop through which electric current flows, typically consisting of a power source, wires, and a load.

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D. Differentiate between the following:

1. Rectilinear motion and curvilinear motion:

   Rectilinear Motion	Curvilinear Motion
   Moves in a straight line.	Moves along a curved path.
   Example: A car on a straight road.	Example: A ball thrown in a parabola.

2. Closed circuit and open circuit:

   Closed Circuit	Open Circuit
   Electric current flows.	Electric current does not flow.
   Example: A circuit with a connected switch.	Example: A circuit with a broken wire.

3. Reuse and recycle:

   Reuse	Recycle
   Using an item again for the same or a different purpose.	Converting waste into new materials.
   Example: Using old jars for storage.	Example: Recycling plastic into new products.

4. Biodegradable waste and non-biodegradable waste:

   Biodegradable Waste	Non-Biodegradable Waste
   Decomposes naturally by microorganisms.	Does not decompose easily.
   Example: Vegetable peels.	Example: Plastic bags.

5. Transparent object and opaque object:

   Transparent Object	Opaque Object
   Allows light to pass through.	Does not allow light to pass through.
   Example: Glass.	Example: Wood.

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E. Convert the following:

a. 2.059 km to cm
$2.059 \, \text{km} = 2.059 \times 100,000 = 205,900 \, \text{cm}$
Answer: 205,900 cm

b. 5.8 g to kg
$5.8 \, \text{g} = 5.8 \div 1000 = 0.0058 \, \text{kg}$
Answer: 0.0058 kg

c. 5/10 m to mm
$5/10 \, \text{m} = 0.5 \, \text{m} = 0.5 \times 1000 = 500 \, \text{mm}$
Answer: 500 mm

d. 1440 min to hr
$1440 \, \text{min} = 1440 \div 60 = 24 \, \text{hours}$
Answer: 24 hours

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F. Answer the following questions:

1. List two characteristics of shadow.

   • A shadow is always formed on the opposite side of the light source.
   • Shadows are dark and do not show color or details of the object.

2. What is the oxygen cycle? Explain with the help of a diagram.
   The oxygen cycle is the process by which oxygen is exchanged between the atmosphere, living organisms, and the Earth through processes like respiration, photosynthesis, and decomposition.
   (Diagram can be provided upon request.)

3. Rest and motion are relative terms. Explain with the help of an example.
   An object can be at rest or in motion depending on the observer's frame of reference.
   Example: A passenger in a moving train is at rest relative to other passengers but in motion relative to someone standing outside the train.

4. Explain the single-touch method of magnetising an object with the help of a diagram.
   In the single-touch method, a magnet is rubbed repeatedly in one direction along the surface of an iron object to magnetize it. This aligns the domains of the iron in the direction of the magnet's field.
   (Diagram can be provided upon request.)

Would you like diagrams for any of the questions?