CBSE Class 6 Science Practice Worksheet Set 26

Q-1. Name a transparent object.
Answer: Glass is a transparent object.
In simple words: Transparent objects allow light to pass through them completely so that we can see clearly through them.

Exam Tip: Mention common everyday examples like glass, pure water, or clean air to ensure full credit.

Q-2 Write the name of a food that is rich in calcium.
Answer: Milk is a food item that is rich in calcium.
In simple words: Calcium is a vital mineral that helps in building strong bones and teeth.

Exam Tip: Other acceptable answers include curd, cheese, and green leafy vegetables like spinach.

Q-3 Name any two cold blooded animals.
Answer: Two cold-blooded animals are frog and snake.
In simple words: Cold-blooded animals (ectotherms) cannot regulate their internal body temperature and change it according to the surroundings.

Exam Tip: Lizards, fish, and turtles are also correct examples of cold-blooded animals.

Q-4. What are omnivores? Give two examples.
Answer: Animals that eat both plants and other animals as food are called omnivores. Two examples of omnivores are bear and human.
In simple words: Omnivores get their nutrition from both plant and animal sources.

Exam Tip: Clearly state the definition mentioning both plant and animal food sources along with correct examples to secure full marks.

Q-5. What are synthetic fibres? Give two examples.
Answer: Fibres that are made from chemical substances by human beings in industries, rather than being obtained from plants or animals, are called synthetic fibres. Two examples are nylon and polyester.
In simple words: Synthetic fibres are man-made materials produced using petrochemicals.

Exam Tip: Always distinguish synthetic fibres from natural fibres by highlighting their chemical or man-origin.

Q-6. What is winnowing? How is it done?
Answer: Winnowing is the method used to separate heavier and lighter components of a mixture by blowing air. It is done by taking the mixture in a basket or winnowing fan, standing at a raised platform, and letting the mixture fall down. The wind blows away the lighter husk particles while the heavier grains fall straight down and collect in a heap.
In simple words: Winnowing uses wind or blowing air to separate light waste (like husk) from heavy seeds.

Q-7. Why do we need proteins in our diet? Give two examples of food that contain protein.
Answer: We need proteins in our diet because they are essential for the growth, repair, and building of body tissues. They are often called body-building foods. Two examples of protein-rich foods are pulses and paneer.
In simple words: Proteins help our body grow and heal damaged cells.

Exam Tip: Use the term body-building foods when describing the function of proteins.

Q-8. Do as directed:-
a) Differentiate between Constipation and dehydration
Answer:
- Constipation is a condition characterized by infrequent or difficult evacuation of dry, hard faeces from the large intestine due to lack of roughage and water.
- Dehydration is a condition caused by the excessive loss of water from the body, leading to a lack of sufficient fluid in the body tissues.
In simple words: Constipation is trouble passing hard stool due to poor diet, while dehydration is a dangerous lack of water in the entire body.

Exam Tip: Present differences in clear comparative points or distinct definitions for clarity.

Q-8. Do as directed:-
b) Differentiate between Decomposers and scavengers
Answer:
- Scavengers are animals that feed on dead and decaying bodies of other animals (e.g., vultures, hyenas).
- Decomposers are micro-organisms like bacteria and fungi that break down dead plant and animal remains into simple chemical nutrients.
In simple words: Scavengers eat dead flesh directly, while decomposers break down dead matter at the microscopic level into simple soil nutrients.

Exam Tip: Remember that scavengers are usually animals, whereas decomposers are mostly microscopic fungi and bacteria.

Q-8. Do as directed:-
c) Differentiate between Hemp and flax
Answer:
- Hemp is a bast fibre obtained from the stems of the Cannabis sativa plant, known for its high durability and used to make ropes, canvas, and coarse fabrics.
- Flax is a plant fibre obtained from the stems of the Linum usitatissimum plant, used primarily to produce finer textile fabrics such as linen.
In simple words: Hemp gives rough, strong fibers for ropes, while flax gives softer fibers used to make linen fabric.

Exam Tip: Mention the plant source and end use of each fibre to make the answer comprehensive.

Q-8. Do as directed:-
d) Draw and name 3 foods that is rich in carbohydrates
Answer: Three foods rich in carbohydrates are:
1. Potato
2. Rice
3. Wheat
In simple words: Carbohydrates are energy-giving foods found abundantly in starchy items like rice, wheat, and potatoes.

Q-9. Explain how do we get cotton from cotton plants.
Answer: Cotton is obtained from cotton plants through the following steps:
1. Cotton bolls (fruit of the cotton plant about the size of a walnut) mature and burst open, exposing the white cotton fibres surrounding the seeds.
2. Cotton is picked by hand from these bolls.
3. The process of ginning is then used to separate the cotton fibres from the seeds by combing.
In simple words: Cotton pods open up when ripe, workers pick them by hand, and then seeds are separated from the fluffy white fibers.

Exam Tip: Highlight the specific terms cotton bolls and ginning to earn full credit.

Q-10. How can the solubility of a substance be increased?
Answer: The solubility of a substance in a solvent can be increased by:
1. Heating the solvent (increasing the temperature).
2. Stirring the mixture continuously.
3. Using powdered or smaller solute particles instead of large chunks.
In simple words: Heating and stirring help substances dissolve faster and in greater amounts in water.

Q-11. What is the importance of water in our body?
Answer: Water is extremely important for our body because:
1. It helps the body absorb essential nutrients from the food we eat.
2. It transports various substances within the body.
3. It helps in removing waste products from the body in the form of urine and sweat.
4. It helps maintain the internal body temperature.
In simple words: Water acts as a medium for nutrient absorption, waste removal, and regulating body temperature.

Exam Tip: State at least three clear physiological functions of water to get full marks.