Olympiad Test Level 2: Our Body and Health- 1 - Class 4 MCQ

Enamel contains the highest percentage of minerals and it is the hardest substance in the human body.

- The correct answer is D: A-3, B-1, C-4, D-2.
- Matching typically involves aligning each item in one column with its corresponding item in another column.
- In this case, each letter (A, B, C, D) is paired with a number (1, 2, 3, 4).
- The pairings in option D suggest that A matches with 3, B with 1, C with 4, and D with 2, which is determined to be the correct alignment based on the given information or context.

The correct path for oxygen is: nose, wind pipe,  lungs,  blood.

A. Heart → 4. is a hollow, muscular organ
B. Stomach → 3. digests food
C. Intestine → 1. is located between the stomach and the anus
D. Lungs → 2. are paired organs

So the correct answer is:

(d) A-4, B-3, C-1, D-2

Platelets (a type of blood cell) and proteins in your plasma (the liquid part of the blood) work together to stop the bleeding by forming a clot over the injury.

Nebulizer is used to treat asthma patients and is not a common item found in the first-aid kit.

Tuberculosis is an infections  disease because it can transfer from one person to another. 

Nervous system controls our whole body and transmits/receives messages from the brain and the body.

The small intestine (small bowel) is a hollow, tubular structure with an average adult length of 22 feet (7 meters), making it the longest portion of the gastrointestinal (GI) tract, where the majority of digestion occurs.

Stapes is present in the ear and is the smallest bone in human body.