Organ & Organ System — NEET Biology MCQs with Solutions
Free NEET Biology Organ & Organ System MCQs with step-by-step solutions (24 questions). Part of Structural Organisation in Animals. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Organ & Organ System · easy · theory
A group of different tissues organised to perform a specific function forms an:
A. Organ system
B. Tissue
C. Cell
D. Organ ✓ Correct
Solution: Organs (e.g. stomach, heart) are made of two or more tissue types working together.
Q2 — Organ & Organ System · easy · theory
Organs that together carry out a coherent set of functions constitute an:
A. Tissue system
B. Organ system ✓ Correct
C. Cell
D. Organ
Solution: Organ systems (e.g. digestive, circulatory) are groups of organs coordinating a major function.
Q3 — Organ & Organ System · medium · theory
The correct hierarchy of structural organisation in complex animals is:
A. Cells → tissues → organs → organ systems ✓ Correct
B. Tissues → cells → organs
C. Organs → cells → tissues
D. Organ systems → organs → cells → tissues
Solution: Increasing complexity: cell → tissue → organ → organ system → organism.
Q4 — Organ & Organ System · medium · theory
The division of labour among organ systems increases efficiency because:
A. Each system specialises in a particular set of functions ✓ Correct
B. It reduces the number of cells
C. All cells do everything
D. It removes the need for coordination
Solution: Specialisation of organ systems allows efficient performance of complex life processes, coordinated by neural/endocrine control.
Q5 — Organ & Organ System · hard · theory
The heart is an organ (not a tissue) because it:
A. Is built of several tissue types (cardiac muscle, connective, epithelial, neural) ✓ Correct
B. Is made of a single tissue
C. Has no specific function
D. Cannot function on its own
Solution: Organs contain multiple integrated tissues; the heart combines cardiac muscle, connective, epithelial (endocardium) and neural tissue.
Q6 — Organ & Organ System · hard · theory
Coordination among organ systems in higher animals is achieved chiefly by the:
A. Skeletal system alone
B. Integumentary system
C. Digestive system only
D. Neural and endocrine (nervous + hormonal) systems ✓ Correct
Solution: The nervous system (fast) and endocrine system (slower, sustained) together integrate the activities of all organ systems.
Q7 — Organ & Organ System · easy · numerical
When several different tissues are organised together to perform one specific function, the resulting structure is called an:
A. Cell
B. Organ system
C. Organ ✓ Correct
D. Tissue
Solution: An organ is built of two or more tissue types integrated to carry out a definite function, such as the stomach or the heart.
Q8 — Organ & Organ System · easy · numerical
Several organs working together to perform a common set of functions constitute an:
A. Organelle
B. Organ system ✓ Correct
C. Organ
D. Tissue
Solution: An organ system is a group of organs coordinating to accomplish a broad function, e.g. the digestive system made of mouth, stomach, intestine and glands.
Q9 — Organ & Organ System · easy · numerical
The correct ascending order of structural organisation in a complex animal is:
A. Cells → tissues → organs → organ systems ✓ Correct
B. Cells → organs → tissues → organ systems
C. Organs → organ systems → tissues → cells
D. Tissues → cells → organs → organ systems
Solution: Cells group into tissues, tissues form organs, and organs combine into organ systems — the standard hierarchy of body organisation in complex animals.
Q10 — Organ & Organ System · medium · numerical
The heart is regarded as an organ rather than a single tissue because it:
A. Is built from several tissues — cardiac muscle, connective, epithelial and neural — working together to pump blood ✓ Correct
B. Consists of a single sheet of epithelial cells
C. Has no blood supply and works by simple diffusion
D. Is made of only cardiac muscle fibres and nothing else
Solution: An organ integrates multiple tissue types; the heart combines cardiac muscle with connective, epithelial (endothelial) and neural tissues to function as a pump.
Q11 — Organ & Organ System · medium · numerical
Division of labour among the organ systems of a complex animal increases efficiency because:
A. Each system specialises in a particular function, so tasks are carried out more effectively than by unspecialised cells ✓ Correct
B. Every organ performs all body functions simultaneously
C. It removes the need for any coordination between systems
D. It makes all tissues in the body structurally identical
Solution: Specialisation lets each system handle a specific role with greater efficiency, though the systems must still be coordinated to work as an integrated whole.
Q12 — Organ & Organ System · medium · numerical
Coordination among the various organ systems of higher animals is achieved chiefly by:
A. The digestive system alone
B. The nervous and endocrine systems acting together ✓ Correct
C. The integumentary (skin) system alone
D. The skeletal and muscular systems only
Solution: The nervous system (fast, electrical) and the endocrine system (slower, hormonal) together integrate and regulate the activities of the body's organ systems.
Q13 — Organ & Organ System · medium · numerical
Which of the following statements about levels of organisation is INCORRECT?
A. A tissue is a group of organs performing one function ✓ Correct
B. An organ may contain more than one type of tissue
C. An organ system is formed of several organs
D. Cells are the basic structural units that build tissues
Solution: A tissue is a group of similar cells, not a group of organs; the reverse ordering makes that statement incorrect while the others are true.
Q14 — Organ & Organ System · medium · numerical
Match the level with an example: (i) Tissue (ii) Organ (iii) Organ system — (p) stomach (q) muscular tissue (r) digestive system. The correct match is:
A. (i)-r, (ii)-p, (iii)-q
B. (i)-p, (ii)-q, (iii)-r
C. (i)-q, (ii)-r, (iii)-p
D. (i)-q, (ii)-p, (iii)-r ✓ Correct
Solution: Muscular tissue is a tissue, the stomach is an organ built of several tissues, and the digestive system is an organ system of several organs.
Q15 — Organ & Organ System · medium
Out of the four basic types of tissues, which is not the one?
A. Muscular tissue
B. Epithelial tissue
C. Neural tissue
D. Skeletal tissue ✓ Correct
Solution: The four basic tissue types are epithelial, connective, muscular and neural. Skeletal tissue is not a separate basic category.
Q16 — Organ & Organ System · medium
The function of the gap junction is to
A. stop substances from leaking across a tissue.
B. separate two cells from each other.
C. perform cementing to keep neighbouring cells together.
D. facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules. ✓ Correct
Solution: Gap junctions connect the cytoplasm of adjoining cells, enabling rapid transfer of ions and molecules for communication.
Q17 — Organ & Organ System · hard
Cell junctions (a) are formed in epithelial tissues, (b) provide structural and functional link between adjacent cells of tissues, (c) are alternatively called gap junctions. Select the most appropriate option.
A. a, b, c are correct
B. Only a is correct
C. b and c are correct
D. a and b are correct ✓ Correct
Solution: Statements a and b are correct; gap junction is only one type of cell junction, so cell junctions are not simply 'gap junctions'.
Q18 — Organ & Organ System · hard
Consider the following statements: a) A tissue is composed of similar cells which perform specific functions. b) Epithelial tissues are characterized by a free surface toward body fluid or the outside environment. Select the correct option.
A. Both a and b are false
B. a is true, b is false
C. Both a and b are true ✓ Correct
D. a is false, b is true
Solution: Both statements correctly describe a tissue and the defining free surface of epithelial tissue.
Q19 — Organ & Organ System · hard
Identify the types of cell junctions that help to stop the leakage of substances across a tissue and facilitate communication with neighbouring cells via rapid transfer of ions and molecules, respectively:
A. Adhering junctions and Gap junctions, respectively
B. Tight junctions and Gap junctions, respectively ✓ Correct
C. Gap junctions and Adhering junctions, respectively
D. Adhering junctions and Tight junctions, respectively
Solution: Tight junctions prevent leakage across a tissue, while gap junctions enable rapid communication between adjoining cells.
Q20 — Organ & Organ System · medium
How many statements are correct?
(i) In unicellular organisms, all functions like digestion, respiration and reproduction are performed by a single cell.
(ii) In the complex body of multicellular animals the basic functions of body are carried out by different groups of cells in a well organised manner.
(iii) The body of a simple organism like Hydra is made of different types of cells and the number of cells in each type can be in thousands.
(iv) In multicellular animals a group of similar cells along with intercellular substances perform a specific function, such an organisation is called tissue.
(v) When two or more tissue performs a common function by their physical and/or chemical interaction, they together form organ system.
A. Two
B. Four ✓ Correct
C. Five
D. Three
Solution: Statements (i)-(iv) are correct; (v) is wrong because tissues combining to perform a common function form an organ (organs form an organ system). So four statements are correct.
Q21 — Organ & Organ System · hard
Which characters for cell junctions are correct from given characters?
(i) Three types of cell junctions are found in the epithelium and other tissues, these are called as tight, adhering and gap junctions.
(ii) Tight junctions help to stop substances from leaking across a tissue.
(iii) Adhering junctions perform cementing to keep neighbouring cells together.
(iv) Gap junctions facilitate the cells to communicate with each other.
(v) Rapid transfer of ions, small molecules and sometimes big molecules takes place through adhering junctions.
A. (ii), (iii), (iv) and (v)
B. (iii), (iv) and (v)
C. (i), (iii), (iv) and (v)
D. (i), (ii), (iii) and (iv) ✓ Correct
Solution: Statements (i)-(iv) are correct; (v) is wrong because rapid transfer of ions and molecules occurs through gap junctions, not adhering junctions.
Q22 — Organ & Organ System · hard
Identify the wrong statements for organisation of animals.
(i) Each organ in our body is made of one or more type of tissues.
(ii) Our heart consists of all the four types of tissues, i.e. epithelial, connective, muscular and neural.
(iii) In plants or microbes morphology refers to study of form or externally visible features.
(iv) In case of animals morphology refers to the external appearance of the organs or parts of the body.
(v) The word anatomy conventionally is used for the study of morphology of internal organs in the animals.
A. (ii), and (iii)
B. (i), (iii) and (iv)
C. None of these ✓ Correct
D. (ii), (iii) and (v)
Solution: All five statements are correct as per NCERT, so none of the statements is wrong.
Q23 — Organ & Organ System · hard
Match List-I with List-II. List-I: (A) Adhering junctions (B) Tight junctions (C) Gap junctions (D) Synaptic junctions. List-II: (i) Establish a barrier that prevents leakage of extracellular fluid across a layer of cells (ii) Function like rivets fastening cells together into strong sheets (iii) Pass information through neurotransmitters from one cell to another (iv) Provide cytoplasmic channels from one cell to adjacent cell for communication.
A. A-i, B-ii, C-iii, D-iv
B. A-i, B-iii, C-ii, D-iv
C. A-ii, B-i, C-iv, D-iii ✓ Correct
D. A-iv, B-iii, C-ii, D-i
Solution: Adhering junctions act like rivets (ii), tight junctions form a leakage barrier (i), gap junctions provide cytoplasmic channels (iv), and synaptic junctions pass information via neurotransmitters (iii).
Q24 — Organ & Organ System · hard
Match the following cell structure with its characteristic feature. Column-I: (a) Tight junctions (b) Adhering junctions (c) Gap junctions (d) Synaptic junctions. Column-II: (1) Cement neighbouring cells together to form a sheet (2) Transmit information through chemicals to other cells (3) Establish a barrier to prevent leakage of fluid across epithelial cells (4) Cytoplasmic channels to facilitate communication between adjacent cells.
A. a-4, b-2, c-1, d-3
B. a-4, b-3, c-1, d-2
C. a-3, b-1, c-4, d-2 ✓ Correct
D. a-2, b-4, c-1, d-3
Solution: Tight junctions form a leakage barrier (3), adhering junctions cement cells into sheets (1), gap junctions provide cytoplasmic channels (4), and synaptic junctions transmit information via chemicals (2).