CBSE Class 4 Science Food Our Basic Need Worksheet

I Fill in the blanks:-

Question 1. ___________ help to keep our body warm
Answer: Fats
In simple words: Fats act as a layer of insulation under our skin that traps body heat.

Exam Tip: Remember that fats provide more energy than carbohydrates and keep the body warm.

Question 2. A ______________ ___________ consists of all the nutrients in the right amount.
Answer: balanced diet
In simple words: A balanced diet contains the right amounts of all essential nutrients, water, and roughage.

Exam Tip: Learn the exact definition of a balanced diet for tests and exams.

Question 3. _________________ helps to remove waste materials from our body.
Answer: Roughage (or Water)
In simple words: Roughage adds bulk to the food and helps in easy bowel movements.

Exam Tip: Do not confuse roughage with nutrients; roughage itself provides no nutrients but is vital for digestion.

Question 4. We can preserve meat and fish for a longer time by ________________________
Answer: freezing / refrigeration
In simple words: Low temperatures slow down the growth of germs that spoil food.

Exam Tip: Mention common food preservation methods like freezing, drying, or canning when asked.

Question 5. _________________ is an ancient method of exercise practiced in India.
Answer: Yoga
In simple words: Yoga helps in maintaining good physical and mental health.

Exam Tip: Yoga is widely recognized globally for promoting flexibility and posture.

II Write 'True' or 'False' for the following statements:-

Question 1. Food items rich in proteins are called energy-giving foods.
Answer: False
In simple words: Protein-rich foods are body-building foods, whereas carbohydrates and fats are energy-giving foods.

Exam Tip: Read carefully: Carbohydrates and fats give energy, proteins build the body, and vitamins/minerals protect against diseases.

Question 2. Regular exercise is important to stay healthy.
Answer: True
In simple words: Exercise keeps our muscles strong and body active.

Exam Tip: Regular physical activity combined with a balanced diet ensures fitness.

Question 3. Three-fourth of our body weight is water.
Exam Tip: Remember the fraction three-fourth (\(\frac{3}{4}\)) in relation to body water content.

Question 4. Fats are also called as protective foods.
Answer: False
In simple words: Vitamins and minerals are protective foods, while fats are energy-giving foods.

Exam Tip: Do not confuse energy-giving foods with protective foods.

III Give two examples for each of the following:-

Question 1. Calcium-rich food items.
Answer: Milk, Cheese (or Curd)
In simple words: Calcium is essential for strong bones and teeth.

Exam Tip: Dairy products are the best primary sources of calcium.

Question 2. Iron-rich food items.
Answer: Spinach, Apple (or Pomegranate, Jaggery)
In simple words: Iron helps in the formation of blood in our body.

Exam Tip: Green leafy vegetables are rich sources of iron.

Question 3. Food items that give us roughage.
Answer: Salad vegetables, Whole grains (or Fruits with skin)
In simple words: Plant fibers provide roughage which aids digestion.

Exam Tip: Raw fruits and vegetables are excellent sources of dietary fiber.

Question 4. Protein-rich food items.
Answer: Pulses, Eggs (or Fish, Paneer)
In simple words: Proteins help us grow and repair worn-out tissues.

Exam Tip: Both plant sources (dals, beans) and animal sources (meat, milk) provide proteins.

Question 5. Food items rich in carbohydrates.
Answer: Rice, Potato (or Wheat, Sugar)
In simple words: Carbohydrates provide instant energy to work and play.

Exam Tip: Cereals and starchy vegetables are the main sources of carbohydrates.

IV Write one word for the following:-

Question 1. Preserving food by removing the water content.
Answer: Dehydration (or Drying)
In simple words: Removing water prevents bacteria and fungi from growing on food.

Exam Tip: Drying food in the sun is a traditional dehydration method.

Question 2. The part of the plant food that cannot be digested.
Answer: Roughage (Dietary fiber)
In simple words: Indigestible plant matter helps clear waste from our digestive tract.

Exam Tip: Roughage passes through the digestive system largely unchanged.

Question 3. They protect us from diseases and keep us healthy.
Answer: Vitamins and Minerals (Protective foods)
In simple words: These micronutrients boost our immune system.

Exam Tip: Fruits and vegetables are packed with vitamins and minerals.

Question 4. It gives us energy and is stored in the body for later use.
Answer: Fat
In simple words: Stored fat acts as a reserve energy source when food intake is low.

Exam Tip: Excess carbohydrates in the body get converted and stored as fats.

Question 5. It refers to our body position.
Answer: Posture
In simple words: Maintaining correct posture prevents back pain and fatigue.

Exam Tip: Always sit and stand straight to maintain good posture.

V HOTS Questions:

Q 1. What will happen to a person who is not getting enough carbohydrates?
Answer: A person who does not get enough carbohydrates will feel weak, tired, and lack the energy required to perform daily physical and mental activities.
In simple words: Lack of carbohydrates leads to low stamina and fatigue due to insufficient energy supply.

Exam Tip: Connect carbohydrates directly to energy production in biological systems.

Q 2. Neena never sits straight in the class. Do you think it is right? If not, then why?
Answer: No, it is not right. Neena should always sit straight because poor posture can lead to backaches, neck pain, fatigue, and can deform the natural shape of the backbone over time.
In simple words: Slouching damages the backbone and causes fatigue; correct posture keeps bones and muscles healthy.

Exam Tip: Emphasize the long-term musculoskeletal effects of bad posture in your answers.