Arrange the following levels of organisation in living beings from the smallest to the largest:
1. Organ
2. Cell
3. Organism
4. Tissue
5. Organ system
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 2, 4, 1, 5, 3
Each level is made up of the one before it, from the smallest to the largest:
2. Cell — The basic unit of life.
4. Tissue — A group of similar cells doing one job is a tissue.
1. Organ — Different tissues together make an organ, such as the heart.
5. Organ system — Organs working together make an organ system, such as the digestive system.
3. Organism — All the organ systems together make the whole organism.