Four Basic Tissues & Organ Systems — NEET Biology
📚 Practice ConceptYou may be surprised to know that all complex animals consist of only four basic types of tissues. These tissues are organised in specific proportion and pattern to form an organ like stomach, lung, heart and kidney. When two or more organs perform a common function by their physical and/or chemical interaction, they together form organ system, e.g., digestive system, respiratory system, etc. Cells, tissues, organs and organ systems split up the work in a way that exhibits division of labour and contribute to the survival of the body as a whole.
Assertion (A): Organ systems exhibit division of labour in multicellular animals. Reason (R): An organ system is formed when two or more organs perform a common function by their physical and chemical interaction.
View solution & NCERT explanation
Correct answer: B — If both assertion and reason are true but reason is not the correct explanation of the assertion.
NCERT states “Cells, tissues, organs and organ systems split up the work in a way that exhibits division of labour” and “When two or more organs perform a common function by their physical and/or chemical interaction, they together form organ system.” Both statements are true from NCERT. However, the Reason defines what an organ system IS, but doesn’t explain WHY division of labour occurs. The structural definition doesn’t explain the functional principle.
What does NCERT say about You may be surprised?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.