High Order Thinking Skills (HOTS) - Class 6 MCQ

Correct answer is A. Seeds and Germination. The activity describes the soaking and sprouting of seeds, and the increase in nutrient content is due to the process of germination. Therefore, the correct answer is A.

When iodine solution is added to a food sample, it reacts with starch to give a bluish-black color. This is a common test to check for the presence of starch in food. In this case, potato is a food rich in starch. Therefore, the correct food product that can be used for this experiment is potato (option b).

The other options are not correct for this iodine test:

• Calcium is not detected with iodine.
• Proteins are not tested with iodine, but with other methods like biuret reagent.
• Vitamin C does not react with iodine in the same way as starch does.

- Thin strands of yarn are made by twisting shorter fibers together.
- Fibers are the basic building blocks of yarn, which can be natural (like cotton or wool) or synthetic (like polyester).
- Yarn is further woven or knitted to create fabrics.
- The correct answer is D: Yarn, fibers, because yarn is composed of multiple fibers twisted together to form a continuous strand.
- This process allows the yarn to be durable and suitable for weaving or knitting into textiles.

1. Weaving:

   • Weaving involves interlacing two sets of yarns at right angles to create a fabric. The two sets of yarns are known as the warp (the set that runs lengthwise) and the weft (the set that runs crosswise). This process is typically carried out on a loom.

2. Knitting:

   • Knitting is a process in which a single thread or yarn is used to create loops, and these loops are interlinked to form a fabric. Knitting can be done by hand or using a knitting machine.

Analyzing the Statements:

1. Swati:

   • Incorrectly defines knitting as making yarn from fibers (which is actually spinning) and incorrectly defines weaving as interlacing yarns (which is correct but does not relate to knitting).

2. Sanchit:

   • Incorrectly defines weaving as making yarn from fibers and incorrectly defines knitting as interlacing yarns at right angles (which is actually weaving).

3. Surbhi:

   • Correctly defines weaving as interlacing two sets of yarns at right angles to make a fabric and correctly states that in knitting, a thread or yarn is used to create a cloth.

4. Sakshi:

   • Incorrectly claims that weaving is done only for silk and knitting only for wool, which is not true.

- Cup B allows her to hold it for a longer time because her hand is in contact with a smaller surface area than with Cup A.
- Less surface area contact means less heat transfer from the cup to her hand, making Cup B feel cooler.
- This results in a more comfortable grip on Cup B, allowing her to hold it longer without discomfort.

• Shyam produces salt from seawater through the process of evaporation. This involves allowing the water to evaporate, leaving salt crystals behind.
• To purify the salt, Shyam uses filteration. This process involves dissolving the impure salt in water, filtering out insoluble impurities, and then allowing the pure salt to crystallize out of the solution as the water evaporates.
• These processes are effective in separating salt from seawater and removing impurities, making the salt suitable for sale.

• Composting vegetable waste involves decomposition, where microorganisms break down organic matter.
• This process is a chemical change because new substances are formed, such as carbon dioxide, water, and humus.
• It is a desirable change as it recycles organic waste into nutrient-rich soil amendment.
• Composting is irreversible because once waste becomes compost, it cannot revert to its original form.

Thus, the correct statement is iv only: a chemical and desirable change.

Baking bread is a chemical change due to irreversible reactions.

• Change in Odour: As bread bakes, new aromas form from reactions between ingredients.
• Change in Texture: The dough transforms into a solid, spongy structure due to heat.
• Change in Taste: New flavors develop from Maillard reactions and caramelization.
• Bread Remains Bread: While true, it doesn't indicate a chemical change.

Thus, the correct answer is C: i, ii, and iii.

Uses of Micro-organisms:  Micro-organisms serve multiple purposes beneficial to humans, such as:

• Food Production: Yeasts are used in baking and brewing.
• Medicine: Bacteria and fungi produce antibiotics.
• Environmental: Aid in decomposing organic matter and bioremediation.

Thus, option A is correct as it focuses on their usefulness to humans.

statements ii and iii are true.

- Organism X has a 4-stage life cycle: egg, larva, pupa, and adult. This is known as complete metamorphosis.
- Organism Y has a 3-stage life cycle: egg, nymph, and adult, which is incomplete metamorphosis.
- The young of organism X (larva) does not resemble the adult, while the young of organism Y (nymph) looks similar to its adult form.
- The ability to fly is not confirmed for both adults based on the diagrams alone.

- When light shines on an object, it blocks light, casting a shadow.
- The size of the shadow depends on distances A (object to torch) and B (object to screen).
- Increasing distance A decreases shadow size since light spreads wider.
- Increasing distance B increases shadow size as the shadow spreads over a larger area.
- Option B correctly illustrates these changes, showing how shadow size varies with A and B.

• In an electric circuit, electricity flows through all components that are part of the circuit and connected in a complete loop.
• The circuit includes a wire, battery, and bulb.
• The wire conducts electricity, the battery provides the electrical energy, and the bulb uses the energy to produce light.
• For electricity to flow, all these components must be connected; thus, electricity passes through the wire, battery, and bulb.
• Therefore, the correct option is C: Wire, battery, and bulb.- In an electric circuit, electricity flows through all components forming a complete loop.
• The circuit includes:
  • Wire: Conducts electricity.
  • Battery: Supplies electrical energy.
  • Bulb: Converts electrical energy into light.
• For a complete circuit, all these components must connect, allowing electricity to flow.
• Thus, electricity passes through the wire, battery, and bulb.

Therefore, the correct option is C: Wire, battery, and bulb.

• In a parallel circuit, the components (like bulbs) are connected in such a way that the electric current can flow along multiple pathways. This means that each light bulb gets the same voltage across it.
• In the given scenario, the light bulbs are connected in parallel because electricity can flow through multiple pathways, one for each light bulb. If one bulb fails, the others will continue to work.

This is in contrast to a series circuit, where the components are connected in a single pathway, and the current flows through each component one by one.

If the nail is magnetized, it could move the compass needle because a compass is affected by magnetic fields. It would attract the paper clip since the clip likely contains iron, which is attracted to magnets. The nail would attract the magnet due to opposite magnetic poles attracting each other, and it would repel the magnet if like poles are facing each other. Therefore, all observations support the nail being magnetized.

- A compass needle aligns itself with the magnetic field lines.
- A bar magnet has a magnetic field with lines that emerge from the north pole and enter the south pole.
- When a compass is near a bar magnet, its north-seeking pole (usually marked) points towards the south pole of the magnet.

The circulatory system is primarily responsible for transporting nutrients, oxygen, and wastes to and from cells. It consists of the heart, blood vessels, and blood. The heart pumps blood through the arteries, which carry oxygen and nutrients to cells, and veins that carry waste products like carbon dioxide and urea back to organs like the lungs and kidneys for excretion.

- The experiment demonstrates that air occupies space.
- When Arav pushed the inverted glass into the water, the air trapped inside prevented water from entering, keeping the paper dry.
- This shows that air takes up space inside the glass, creating a barrier against the water.
- If air did not occupy space, water would fill the glass and wet the paper.
- The experiment effectively illustrates this fundamental property of air.

The amount of precipitation that soaks into the soil depends on various factors:

• How long the rain lasts: The longer it rains, the more water will have a chance to soak into the soil.
• Whether or not there are plants around: Plants can influence how much water soaks into the soil. Their roots can absorb water, and the presence of vegetation can reduce surface runoff, allowing more water to be absorbed.
• Whether the soil is wet or dry: Dry soil can absorb more water initially compared to wet soil, as it has more capacity to soak up water.

All these factors collectively determine the amount of precipitation that will soak into the soil.

When James drops the stone, it moves in a straight line (vertically downward) due to the force of gravity. This type of motion, where an object moves along a straight path, is called rectilinear motion. The stone experiences a constant acceleration due to gravity as it falls.

In circular motion, an object moves in such a way that its distance from a fixed point stays constant. For instance, the blades of a fan. When an electric fan is turned on in your room, it is considered to be in motion, even though it is attached to the ceiling, because the blades continuously change their position over time, moving in a circular path.