Question

CLASS VII
SCIENCE
Answer the following questions: 1x6=6
1. What is nutrition?
ich-1)
2. What are Villi? (ch-2)
3. What are acids? (Ch-5)
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4. Burning of coal is what change? (CH-6) cut)
5. What is the basic unit of speed? (Ch-13)
6. Name any effect of electric current? (Ch-14)
H. Answer the following questions: 2x6=12
1 What are the components of food? (Ch-1
2. Why do we get instant energy from glucose?
Explain why an antacid tablet is taken when you suffer from acid
lain how painting of gate prevents it from rusting
distance between​

Answer 1

Answer:

1. Nutrition is defined as the processes by which an animal or plant takes in and utilises food substances. Essential nutrients include protein, carbohydrate, fat, vitamins, minerals and electrolytes
2. Villus, plural villi, in anatomy any of the small, slender, vascular projections that increase the surface area of a membrane. ... The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions.
3. Acid, any substance that in water solution tastes sour, changes the colour of certain indicators (e.g., reddens blue litmus paper), reacts with some metals (e.g., iron) to liberate hydrogen, reacts with bases to form salts, and promotes certain chemical reactions (acid catalysis).
4. Burning of Coal is a chemical change.
5. The unit of distance is the metre (m) and of time is second(s). Therefore the basic unit of speed is m/s.
6. The two effects of electric current are; heating effect and magnetic effect. ... The magnetic field causes deflection in the magnetic
7. There are six main components present in food: carbohydrates, fats, proteins, vitamins, minerals, and roughage or dietary fibres. These nutrients fulfill different needs of the body.
8. Glucose is a simple sugar which can be readily absorbed by the body. Once inside, glucose undergoes oxidation, which results in the release of ATP, a high-energy molecule that provides energy for the cell. ..
9. .Acidity is caused due to the excess production of acids in the stomach. An antacid tablet contains bases, such as milk of magnesia(magnesium hydroxide, gelusil,etc. These bases react with excess of acids and neutralize the effect of excessive acid and brings relief.
10. For rusting, the presence of air(oxygen) and moisture(water) is required. Painting prevents direct interaction of iron, air and moisture. Hence, painting of an iron gate prevents it from rusting.