Structural Organisation in Animals is a Class 11 Zoology chapter in the NEET (UG) syllabus. NEET720 has 1,131 reviewed practice questions on it, each with a quick answer and a step-by-step explanation. The 8 questions below are free and fixed, so you can bookmark this page; the full chapter, plus mistake tracking and spaced revision, is in the app.
167
easy
765
medium
199
hard
Topics covered
Epithelial Tissue · Connective Tissue · Muscle and Neural Tissue · Morphology and Anatomy of Frog · Frog: External Features · Frog: Skeletal System · Frog: Endocrine glands (structural) · Frog: Muscular System · Frog: External Morphology and Habits · Frog: Digestive System · Frog: Respiratory System · Frog: Nervous System · Frog: Sense Organs · Frog: Reproductive System · Cockroach: Body Organisation (comparative) · Cockroach: Digestive System (comparative) · Comparative anatomy · Earthworm Morphology · Earthworm Anatomy · Cockroach Morphology · Frog Anatomy · Earthworm · Cockroach · Animal tissues · Coelom · Segmentation · Body organisation · Body symmetry · Comparative organ systems · Cockroach Anatomy · Structural Organisation in Animals · Muscle tissue · Frog · Frog dissection landmarks · Cell junctions and organisation levels · Epithelial and connective tissue · Cockroach dissection · Frog dissection · Epithelial vs connective tissue · Neural tissue
8 free Structural Organisation in Animals practice questions with answers
Choose an answer in your head before opening it. Each explanation says why the correct option is right and, where relevant, why the tempting wrong option is wrong.
Question 1 · easy · Connective Tissue
In connective tissues, the intercellular ground substance in which cells and fibres are embedded is called the:
- A.Matrix
- B.Cytoplasm
- C.Basement membrane
- D.Sarcoplasm
Show answer and explanation
Answer: A. Matrix
The matrix is the non-living ground substance of connective tissue, secreted by its cells, and it may be jelly-like, fluid, or dense depending on the tissue type.
NCERT defines connective tissue as having relatively few cells scattered in an extracellular matrix, which is the specific character-determining component. The matrix may be jelly-like (areolar), fluid (blood plasma), or solid/rigid (bone). Cytoplasm (B) is intracellular, not extracellular. Basement membrane (C) underlies epithelium, a separate structure. Sarcoplasm (D) is muscle-fibre cytoplasm.
Common mistake: Students conflate 'matrix' with generic 'cell substance' terms like cytoplasm.
Key point: Matrix = extracellular ground substance of connective tissue; its consistency (jelly/fluid/solid) determines the tissue's specific character.
Question 2 · easy · Connective Tissue
Areolar connective tissue is typically located:
- A.Forming the cartilage caps of joints
- B.Beneath the skin
- C.Within the shaft of long bones
- D.Lining the internal cavity of blood vessels
Show answer and explanation
Answer: B. Beneath the skin
Areolar tissue is present beneath the skin and around blood vessels, nerves, and organs, acting as a packing and supporting tissue.
NCERT states areolar tissue is present beneath the skin and supports internal organs, also providing a medium for nerves and blood vessels to enter organs. Options B, C and D describe locations of bone, endothelium, and cartilage respectively, not areolar tissue.
Common mistake: Mixing up locations of different connective tissue subtypes.
Key point: Areolar tissue lies beneath the skin, packing and supporting organs and providing entry routes for nerves/vessels.
Question 3 · easy · Connective Tissue
The cells specialised for the storage of fat in adipose tissue are called:
- A.Mast cells
- B.Chondrocytes
- C.Adipocytes
- D.Osteocytes
Show answer and explanation
Answer: C. Adipocytes
Adipocytes are large, fat-storing cells that make up adipose tissue, found below the skin and between internal organs.
NCERT identifies adipose tissue as being located below the skin, with adipocytes (fat cells) storing excess nutrients as fat. Chondrocytes and osteocytes belong to cartilage and bone respectively; mast cells are a component of areolar tissue involved in inflammatory responses, not fat storage.
Common mistake: Confusing adipocytes with other connective-tissue cell types by suffix similarity (-cyte).
Key point: Adipocytes = fat-storage cells of adipose tissue; excess nutrients are converted to fat and stored in them.
Question 4 · medium · Connective Tissue
Which connective tissue fibre type is primarily responsible for providing tensile strength?
- A.Muscle fibres
- B.Elastic fibres
- C.Reticular fibres
- D.Collagen fibres
Show answer and explanation
Answer: D. Collagen fibres
Collagen fibres are tough, white fibres in the connective tissue matrix that resist stretching and provide high tensile strength.
NCERT describes three main fibre types in connective tissue: collagen fibres (great tensile strength), elastic fibres (elasticity, allow stretch and recoil), and reticular fibres (form a fine supportive meshwork linking connective tissue to neighbouring tissues). Muscle fibres are not a connective-tissue fibre category at all — they are the cells of muscle tissue.
Common mistake: Assuming all connective tissue fibres serve the same mechanical function.
Key point: Collagen = tensile strength; elastic = stretch and recoil; reticular = supportive meshwork.
Question 5 · medium · Connective Tissue
Fibres that allow a connective tissue to stretch and then recoil back to its original length are called:
- A.Elastic fibres
- B.Keratin fibres
- C.Collagen fibres
- D.Reticular fibres
Show answer and explanation
Answer: A. Elastic fibres
Elastic fibres contain the protein elastin and allow connective tissue to stretch under tension and spring back once released.
Of the three connective tissue fibre types, elastic fibres uniquely confer elasticity — the ability to be stretched and to recoil. Collagen fibres resist stretching (tensile strength, not elasticity). Reticular fibres form a delicate branching meshwork that supports and connects tissue components. Keratin is unrelated — a fibrous protein found in epidermal keratinocytes.
Common mistake: Treating 'strong' and 'elastic' as interchangeable properties.
Key point: Elastic fibres provide elasticity (stretch-and-recoil), distinct from collagen's tensile strength.
Question 6 · easy · Connective Tissue
The connective tissue cells that secrete the matrix and fibres of areolar tissue are called:
- A.Mast cells
- B.Fibroblasts
- C.Osteoblasts
- D.Macrophages
Show answer and explanation
Answer: B. Fibroblasts
Fibroblasts are the principal cells of loose connective tissue that actively secrete the ground substance and fibrous proteins (collagen, elastin) of the matrix.
Areolar tissue contains several cell types — fibroblasts, macrophages, mast cells, and others embedded in the matrix. Among these, fibroblasts are specifically responsible for synthesising and secreting the matrix and fibres. Macrophages perform phagocytosis; mast cells release histamine/heparin; osteoblasts are the analogous matrix-secreting cells of bone, not areolar tissue.
Common mistake: Treating all cells found in areolar tissue as interchangeable in function.
Key point: Fibroblasts secrete the matrix and fibres of connective tissue; do not confuse with macrophages or mast cells, which are also present but functionally different.
Question 7 · medium · Connective Tissue
Areolar tissue is often described as a 'packing tissue' between organs mainly because it:
- A.Forms a rigid mineralised framework that bears the entire body weight
- B.Contracts rhythmically to move organs against one another
- C.Secretes digestive enzymes to break down absorbed nutrients
- D.Fills spaces inside and between organs while supporting them and allowing nerves and blood vessels to pass through
Show answer and explanation
Answer: D. Fills spaces inside and between organs while supporting them and allowing nerves and blood vessels to pass through
Areolar tissue's loosely arranged cells and fibres in a semi-fluid matrix let it fill gaps around organs, giving mechanical support while permitting vessels and nerves to enter.
As a loose connective tissue, areolar tissue lies beneath the skin and around organs, vessels, and nerves. Its loose, semi-fluid matrix lets it occupy the small spaces between structures, cushioning and supporting them, while providing a route through which nerves and blood vessels reach deeper organs. It is not rigid (unlike bone), not contractile (unlike muscle), and not secretory in the digestive sense.
Common mistake: Assuming any 'supportive' tissue must be rigid like bone or cartilage.
Key point: Areolar tissue supports internal organs and provides passage for nerves/vessels because of its loose, space-filling arrangement.
Question 8 · medium · Connective Tissue
The layer of adipose tissue found below the skin contributes functionally to the body mainly by:
- A.Acting as an insulator that reduces heat loss from the body
- B.Generating action potentials that regulate skin sensation
- C.Producing keratin to waterproof the epidermis
- D.Synthesising collagen fibres for tendon strength
Show answer and explanation
Answer: A. Acting as an insulator that reduces heat loss from the body
Fat stored in adipocytes of subcutaneous adipose tissue acts as a poor conductor of heat, insulating the body against heat loss.
Adipose tissue, located below the skin, stores excess nutrients as fat within adipocytes. Because fat conducts heat poorly, this subcutaneous fat layer also serves as thermal insulation, helping the body conserve heat. It has no role in nerve signalling, keratin production, or collagen synthesis for tendons — those belong to neurons, epidermal keratinocytes, and dense connective tissue fibroblasts respectively.
Common mistake: Focusing only on 'storage' and overlooking the equally testable insulation function.
Key point: Beyond fat storage, adipose tissue insulates the body by minimising heat loss.
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Questions about Structural Organisation in Animals for NEET
How many NEET questions does NEET720 have on Structural Organisation in Animals?＋
NEET720 has 1,131 reviewed practice questions on Structural Organisation in Animals (Zoology): 167 easy, 765 medium and 199 hard. 8 of them are free on this page with full explanations; the rest are available in the app.
Is Structural Organisation in Animals a Class 11 or Class 12 chapter for NEET?＋
Structural Organisation in Animals is a Class 11 Zoology chapter in the NEET (UG) syllabus. Read the NCERT chapter first, then practise chapter-wise MCQs and previous-year questions.
How should I practise Structural Organisation in Animals for NEET?＋
Attempt the questions below without looking at the options for more than a few seconds, mark your answer, then read the explanation even when you were right. Record every mistake and revisit it after a gap. On NEET720 this happens automatically: wrong answers go to your Mistake Book and are scheduled for spaced revision.
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Questions are original NEET720 compositions reviewed for correctness, syllabus fit and option quality. Counts update as the bank grows (1,131 active practice questions in this chapter today).