Structural Organisation in Animals NEET PYQReal NEET & AIPMT 2006–2021 questions, year-tagged, with solutions
By the RankUp team, founded by Dr. Deepak Sahu (MBBS Gold Medalist, NEET PG AIR 1731) · Updated
Every Structural Organisation in Animals question from the NEET & AIPMT papers on this site (2006–2021), newest first. Each is tagged with its paper. Tap an option to check your answer and read the explanation.
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Structural Organisation in Animals previous year questions
28 questions. Tap an option to check your answer.
Q1NEET 2021
Which of the following statements wrongly represents the nature of smooth muscle ?
Not quite — the answer is C.
Intercalated discs are found in cardiac muscle, where they let the cells contract as a unit, so attributing them to smooth muscle is wrong. Smooth muscle is non-striated, involuntary and found in the walls of blood vessels and other hollow organs.
Q2NEET 2021
Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.
Not quite — the answer is B.
Tight junctions seal neighbouring cells together and stop substances leaking across a tissue, while gap junctions connect the cytoplasm of adjoining cells for rapid transfer of ions and small molecules. Adhering junctions only cement cells together.
Q3NEET 2020 · Q15
Cuboidal epithelium with brush border of microvilli is found in:
Not quite — the answer is C.
Cuboidal epithelium bearing a brush border of microvilli lines the proximal convoluted tubule of the nephron, where it increases the surface for reabsorption. The intestine is lined by columnar epithelium with microvilli, salivary gland ducts by plain cuboidal epithelium, and the eustachian tube by ciliated epithelium.
Q4NEET 2020 · Q89
Goblet cells of alimentary canal are modified from:
Not quite — the answer is B.
Goblet cells, which secrete mucus in the alimentary canal, are modified columnar epithelial cells. Squamous cells are flat lining cells, compound epithelium is protective, and chondrocytes are cartilage cells.
Q5NEET 2019 · Q101
Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth :
Not quite — the answer is A.
In the cockroach the oesophagus opens into a sac-like crop that stores food, followed by the grinding gizzard; the midgut then leads to the hindgut made of ileum, colon and rectum. The gizzard comes after the crop, not before it.
Q6NEET 2019 · Q104
The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in :
Not quite — the answer is D.
Ciliated epithelium lines hollow organs such as the bronchioles and fallopian tubes, where cilia move mucus or the ovum in one direction. Ducts of glands such as bile, pancreatic and salivary ducts are lined by cuboidal or columnar epithelium without cilia.
Q7NEET 2017 · Q102
Select the correct route for the passage of sperms in male frogs:
Not quite — the answer is D.
In male frogs the vasa efferentia leave the testes and enter the kidney, where they open into Bidder's canal, which joins the urinogenital duct (ureter) that opens into the cloaca. Routes that place Bidder's canal before the vasa efferentia or skip the kidney do not match frog anatomy.
Q8NEET 2017 (Gujarati paper) · Q60
Select the incorrect option with respect to features present in three animals. Characters | Cockroach | Earthworm | Frog
Not quite — the answer is D.
Cockroach development is indirect (paurometabolous, through nymphs) and earthworm development is direct, so the development row is wrong for both. The circulation row (open, closed, closed), body surface and eye rows correctly describe the three animals.
Q9NEET 2017 (Gujarati paper) · Q82
Which of the following structures does not open into the genital chamber of female cockroaches?
Not quite — the answer is C.
Anal cerci are jointed filamentous appendages on the 10th abdominal segment of both sexes and are external sense organs, so they do not open into the genital chamber. The median oviduct (vagina), spermatheca and collateral glands all open into the female genital chamber.
Q10NEET 2016 Phase 2 · Q141
Smooth muscles are
Not quite — the answer is A.
Smooth muscle fibres are spindle-shaped (fusiform), uninucleate, have no striations and are not under voluntary control, as in the walls of the gut and blood vessels. Voluntary, multinucleate, cylindrical and striated fibres describe skeletal muscle.
Q11NEET 2016 Phase 1 · Q142
Which type of tissue correctly matches with its location?
Not quite — the answer is A.
Smooth (visceral) muscle forms the walls of the intestine and other hollow organs. Tendons are dense regular connective tissue, the tip of the nose has cartilage, and the stomach is lined by columnar epithelium.
Q12AIPMT 2015
The terga, sterna and pleura of cockroach body are joined by:
Not quite — the answer is D.
The hardened plates of the cockroach exoskeleton (tergites, sternites and pleurites) are joined by a thin, flexible arthrodial membrane that allows movement. Cartilage and muscle do not join these plates.
Q13AIPMT 2014
Choose the correctly matched pair:
Not quite — the answer is B.
The tubular parts of nephrons are lined by simple cuboidal epithelium (with brush border in the proximal tubule). The buccal cavity is lined by stratified squamous epithelium, bronchioles by ciliated epithelium, and salivary ducts by cuboidal epithelium, so the other pairings are wrong.
Q14AIPMT 2014
Choose the correctly matched pair:
Not quite — the answer is B.
Areolar tissue is a loose connective tissue found beneath the skin. Adipose tissue is also loose (not dense) connective tissue, tendon is dense regular connective tissue, and cartilage is a specialised connective tissue.
Q15AIPMT 2012 Mains
The supportive skeletal structures in the human external ears and in the nose tip are examples of
Not quite — the answer is D.
The external ear (pinna) and the tip of the nose are supported by flexible cartilage. Bone would be rigid, and ligaments join bone to bone rather than forming such frameworks.
Q16AIPMT 2011 Mains
The cells lining the blood vessels belong to the category of
Not quite — the answer is D.
The inner lining of blood vessels (endothelium) is a single layer of flat, thin cells, i.e. simple squamous epithelium, which suits diffusion across the vessel wall. Columnar epithelium lines the stomach and intestine, not blood vessels; smooth muscle lies in the middle layer of the wall, not the lining.
Q17AIPMT 2011 Mains
Which one of the following structures in Pheretima is correctly matched with its function?
Not quite — the answer is C.
The clitellum of Pheretima secretes the cocoon in which the eggs are deposited. Setae help in locomotion, the typhlosole increases the absorptive area of the intestine, and the gizzard grinds food rather than absorbing it.
Q18AIPMT 2011 Prelims
The ciliated columnar epithelial cells in humans are known to occur in
Not quite — the answer is C.
Ciliated columnar epithelium lines hollow organs such as the bronchioles and the Fallopian tubes, where the cilia move mucus or the ovum along. The stomach is lined by non-ciliated columnar epithelium and the oesophagus by stratified squamous epithelium.
Q19AIPMT 2010 Prelims · Q117
The kind of epithelium which forms the inner walls of blood vessels is
Not quite — the answer is A.
Blood vessels are lined by a single layer of thin, flat cells (simple squamous epithelium, the endothelium), which suits diffusion and filtration. Cuboidal epithelium lines ducts and kidney tubules, not vessels.
Q20AIPMT 2010 Prelims · Q149
If for some reason our goblet cells are non-functional this will adversely affect
Not quite — the answer is A.
Goblet cells are unicellular glands in the columnar epithelium of the alimentary canal, and they secrete mucus. Mucus lubricates the gut lining so food moves smoothly. Somatostatin comes from delta cells, and sebum from sebaceous glands, so goblet cells play no part in either.
Q21AIPMT 2009 Prelims · Q51
Which one of the following is correct pairing of a body part and the kind of muscle tissue that moves it?
Not quite — the answer is C.
The muscles of the iris that change pupil size are smooth, involuntary muscles. The abdominal wall is moved by skeletal (striated, voluntary) muscles, so pairing it with smooth muscle is wrong; the biceps is also skeletal and the heart wall is striated cardiac muscle.
Q22AIPMT 2009 Prelims · Q52
The epithelial tissue present on the inner surface of bronchioles and fallopian tubes is:
Not quite — the answer is B.
NCERT states that ciliated epithelium lines hollow organs such as bronchioles and fallopian tubes, where the beating cilia move mucus or the ovum in one direction. Squamous epithelium lines blood vessels and air sacs, not these tubes.
Q23AIPMT 2009 Prelims · Q67
The cell junctions called tight, adhering and gap junctions are found in:
Not quite — the answer is B.
NCERT describes tight, adhering and gap junctions as the special junctions that hold epithelial cells together and link them structurally and functionally. Connective tissue cells are scattered in a matrix and do not form such sheets.
Q24AIPMT 2009 Prelims · Q150
The kind of tissue that forms the supportive structure in our pinna (external ears) is also found in:
Not quite — the answer is C.
The pinna is supported by cartilage, which NCERT says is also present in the tip of the nose, the outer ear joints and between adjacent vertebrae. Ear ossicles and vertebrae themselves are bone, and nails are keratin.
Q25AIPMT 2008 Prelims · Q145
Which one of the following is the true description about an animal concerned?
Not quite — the answer is A.
The cockroach has 10 pairs of spiracles, 2 on the thorax and 8 on the abdomen. In earthworm the gizzard comes before the stomach, the frog has no neck (only head and trunk), and in rat the right kidney lies slightly higher than the left.
Q26AIPMT 2007 Prelims · Q134
In which one of the following preparations are you likely to come across cell junctions most frequently?
Not quite — the answer is D.
Epithelial cells are tightly packed with little intercellular matrix, and they are held together by tight, adhering and gap junctions. Tendon and cartilage cells are scattered in abundant matrix, and platelets are free cell fragments, so junctions are rare there.
Q27AIPMT 2006 Prelims · Q173
Areolar connective tissue joins :
Not quite — the answer is B.
Areolar tissue lies beneath the skin and attaches the skin (integument) to the underlying muscles. Bones are joined to muscles by tendons and to other bones by ligaments.
Q28AIPMT 2006 Prelims · Q174
Mast cells secrete :
Not quite — the answer is C.
Mast cells of connective tissue release histamine (and heparin, serotonin) during inflammation and allergy. Haemoglobin and myoglobin are oxygen-binding proteins of RBCs and muscle, not secretions.
How often Structural Organisation in Animals came up
Questions from this chapter in each paper on this site.
- NEET 2021: 2
- NEET 2020: 2
- NEET 2019: 2
- NEET 2017: 1
- NEET 2017 (Gujarati paper): 2
- NEET 2016 Phase 2: 1
- NEET 2016 Phase 1: 1
- AIPMT 2015: 1
- AIPMT 2014: 2
- AIPMT 2012 Mains: 1
- AIPMT 2011 Mains: 2
- AIPMT 2011 Prelims: 1
- AIPMT 2010 Prelims: 2
- AIPMT 2009 Prelims: 4
- AIPMT 2008 Prelims: 1
- AIPMT 2007 Prelims: 1
- AIPMT 2006 Prelims: 2
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