CBSE Class 7 Science Advanced Biology Food and Food Preservation Very Short Answer Questions Set 01

Very Short Answer Questions

Question 1. Fill in the blank: ______ is the condition in which there is an imbalance between a person's food intake and requirement.
Answer:
Malnutrition
In simple words: Malnutrition means the food eaten does not match what the body needs.

Teacher's Note:
1. Both too much and too little food can cause it.
2. Remember the word 'mal' means bad.

Question 2. Fill in the blank: Burger, pizza, etc., are examples of ______ food.
Answer:
Junk food.
In simple words: Tasty, oily foods with little nutrition are junk food.

Teacher's Note:
1. Junk food has plenty of oil and salt but few useful nutrients.
2. Eating it too often can lead to obesity.

Question 3. Fill in the blank: ______ is a food-preserving method in which water content of food is reduced to prevent microbial growth.
Answer:
Drying
In simple words: Microbes need moisture, so removing water protects the food.

Teacher's Note:
1. Drying in sunlight is the oldest preservation method.
2. Dry fruits and dry meat are examples.

Question 4. Fill in the blank: Pasteurization was first demonstrated by ______.
Answer:
Louis Pasteur, a French scientist.
In simple words: The process is named after the scientist who first showed it.

Teacher's Note:
1. The name of the process comes from his name.
2. Do not confuse him with Linnaeus or Darwin.

Question 5. Fill in the blank: ______ are tall tower-like structures on a farm meant for food storage.
Answer:
Silos
In simple words: Silos are tall towers used to keep large amounts of grain.

Teacher's Note:
1. Granaries are different: they are raised storehouses.
2. Silos store grain in bulk.

Question 6. Name two artificial preservatives.
Answer:
Vinegar (acetic acid) and sodium benzoate.
In simple words: Vinegar and sodium benzoate are chemicals added to keep food from spoiling.

Teacher's Note:
1. Artificial preservatives are chemicals, not natural methods like drying.
2. Name at least two to get full marks.

Question 7. What is malnutrition?
Answer:
Malnutrition is a condition in which there is an imbalance between the person's food intake and the necessity of the body.
In simple words: The body is getting either too much or too little of what it needs.

Teacher's Note:
1. Under eating and over eating are both forms of it.
2. Write the word 'imbalance' in your answer.

Question 8. What is the difference between silos and granaries?
Answer:
Granaries are large storehouses, often built above the ground, that keep stored food grains away from pests and other animals.
Silos are tall tower-like structures on a farm used to store bulk materials such as large amounts of grain.
In simple words: A granary is a raised store; a silo is a tall tower.

Teacher's Note:
1. Mention the shape or location of each.
2. Both protect stored grain from pests.

Question 9. Name the disease caused due to protein deficiency in children.
Answer:
Kwashiorkor
In simple words: Kwashiorkor is the disease of children who do not get enough protein.

Teacher's Note:
1. Marasmus is different: it is caused by lack of proteins, carbohydrates and fats.
2. Kwashiorkor shows in children aged 1 to 5 years.

Question 10. A food item gives a blue-black colour with iodine. What does this tell you about the composition of this food item?
Answer:
The food item contains starch.
In simple words: Iodine turns starch blue-black, so the food has starch.

Teacher's Note:
1. This is the standard test for starch.
2. The iodine solution turns blue-black only when starch is present.

Question 11. It is not advised to wash fruits and vegetables after cutting them. Why?
Answer:
If fruits and vegetables are washed after cutting, the vitamins and minerals present in them are washed away. So they should be washed before cutting and not after.
In simple words: Cut pieces lose their nutrients into the wash water.

Teacher's Note:
1. Wash first, then cut.
2. Water-soluble vitamins escape easily from cut surfaces.