HOTs for Science Olympiad -3 - Class 4 MCQ

'P' is the mouth where digestion of food starts with the help of saliva.
'Q' is the oesophagus which acts as a passage for the conduction of food from the mouth to the stomach. 
No digestion takes place here. 'R' is the stomach where food is mixed with digestive juices. Digestion of all food components takes place in the small intestine. 
In the large intestine, 'S', water is absorbed from the undigested food.

Food that you eat is broken down into smaller pieces and then it enters the oesophagus, the stomach and then, the small intestine.

In the given flow chart 'Y' is the mouth and Z is the stomach.

The balanced diet pyramid emphasizes carbohydrates at the base, followed by fruits and vegetables, protein-rich foods, and fats at the apex, reflecting recommended intake levels for each group.

Proteins are body-building foods.

Saliva gets mixed with the food and makes it easy to swallow. Thus (c) is an incorrect match.

A. False - The heart beats continuously.
B. False - Blood primarily carries oxygen, not hydrogen, to body parts.
C.False - Digestion breaks down food for nutrients; waste removal is a separate process.
D. True - We derive energy from food.

Epiglottis prevents the entry of food into the windpipe.