Free Levels of Biological Organization MCQs with Answers

1. Which of the following shows the CORRECT order of biological levels of organisation fromcomplex to simple?

• A. Spleen → Leucocyte → Mitochondria → Adenine
• B. Mitochondria → Spleen → Leucocyte → Adenine
• C. Mitochondria → Adenine → Leucocyte → Spleen
• D. Spleen → Leucocyte → Adenine → Mitochondria

Explanation: The correct order of biological organization from complex to simple is: Spleen → Leucocyte → Mitochondria → Adenine. The spleen is an organ, which is more complex than a leucocyte, a type of cell. Mitochondria are organelles within cells, and adenine is a nucleotide, a molecular component of DNA and RNA. The other options incorrectly order these structures, either starting with a simpler component or misordering the organelles and molecules.

2. Following is the largest organ in human body.

• A. Skin
• B. Liver
• C. Large intestine
• D. Both A and B

Explanation: Skin covers our entire body hence has the largest surface area out of all the organs.

3. Which of the following is the lowest level of biological organization with respect to others?

• A. Multicellular organisms
• B. Biosphere
• C. Species
• D. Population

Explanation: Option A is correct since Multicellular organism level is the lowest that consist only one organism.Option B is incorrect because Biosphere is the thin layer of earth where all types of life exist, it is highest level.Option C is incorrect because Specie is very similar , potentially interbreeding organisms it is next to organism level.Option D is incorrect because Population is members of one species inhibiting the same area and it is next to specie level.

4. The part of the body which forms a structural and functional unit and is composed of more than one tissue is called

• A. Organ
• B. Organelle
• C. Organ system
• D. Whole organism

Explanation: An organ is defined as a collection of tissues, which combine to form a functional unit within the body, specialized at carrying out a specific task.

5. In humans, the largest body organ is:

• A. Liver
• B. Skin
• C. Brain
• D. Lungs

Explanation: The largest organ in the human body is the skin. It covers and protects our entire body, acting as a barrier against external elements. The skin has several important functions, including regulating body temperature, sensing touch, protecting against harmful UV radiation, and preventing the loss of water from the body. It's like a protective shield that keeps our body safe and maintains its overall health.