Structural Organisation in AnimalsNEET MCQs with solutions
Structural Organisation in Animals covers the four animal tissues and then studies three animals in detail. NEET questions pick up the exact location of each tissue type and very specific morphological facts about the cockroach and the frog — segment numbers, chamber counts and organ positions.
- Class
- 11 Biology
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- 24 questions
- In the RankUp app
- 697 questions
- ELITE questions
- 69
- NCERT topics
- 4
Practise 24 questions
Tap an option to check it. Questions from every NCERT topic in this chapter, from easy to hard.
Q1Animal Tissues
The apical (free) surface of absorptive epithelial cells in the small intestine is specialised by the presence of:
Not quite — the answer is A.
Microvilli on the apical surface form the brush border, dramatically increasing absorptive surface area. Tight junctions are on the lateral surface near the apex; hemidesmosomes are on the basal surface; cilia are present in respiratory and reproductive epithelia, not the small intestine.
Q2Animal Tissues
Mucus secreted by goblet cells protects the epithelial lining primarily by:
Not quite — the answer is A.
Mucus lubricates the epithelial surface (reducing physical friction) and forms a gel barrier that traps pathogens and protects against digestive enzymes and acid. It does not enhance diffusion — if anything, a thick mucus layer slightly impedes it.
Q3Animal Tissues
Glandular epithelium is classified on multiple bases. Which of the following is a correct basis of classification of exocrine glands?
Not quite — the answer is D.
Exocrine glands are classified by: (1) number of cells (unicellular/multicellular), (2) structure (tubular/acinar/tubuloacinar), and (3) mode of secretion (merocrine — secretion by exocytosis; apocrine — part of cell released; holocrine — entire cell disintegrates). Germ layer origin is not a functional classification criterion.
Q4Animal Tissues
The extreme thinness of simple squamous epithelium makes it ideally suited for locations requiring:
Not quite — the answer is D.
Flat, thin simple squamous cells offer minimal barrier to diffusion — making them ideal for alveoli (gas exchange), glomeruli (filtration), and vessel walls. Active secretion requires metabolically active cuboidal or columnar cells.
Q5Animal Tissues
Pseudostratified epithelium appears to be multilayered under a microscope, yet is classified as simple epithelium. Which observation best justifies this classification?
Not quite — the answer is B.
The defining criterion for "simple" epithelium is that every cell rests on the basement membrane — even if not all cells reach the lumen. The varied nuclear heights create the false appearance of stratification. This is exactly why it is called pseudo (false) stratified.
Q6Animal Tissues
Epithelium is avascular. How do epithelial cells receive nutrients?
Not quite — the answer is A.
Epithelium lacks blood vessels and depends entirely on diffusion from the richly vascular connective tissue beneath it. Active transport and lymphatic supply do not substitute for this.
Q7Animal Tissues
Simple epithelium is highly efficient for exchange of materials because it:
Not quite — the answer is D.
A single cell layer means substances need to cross only one cell, minimizing diffusion distance. Multilayering (stratified epithelium) actually reduces exchange efficiency but increases protection.
Q8Earthworm
Earthworm is described as a detritivore because it:
Not quite — the answer is D.
Detritivores consume decomposing organic material (detritus). Earthworm ingests soil rich in dead organic matter, making it a detritivore and an important decomposer in ecosystems.
Q9Earthworm
Which layer lies immediately below the circular muscle layer in the earthworm body wall?
Not quite — the answer is C.
The sequence from outside inward is: cuticle → epidermis → circular muscle → longitudinal muscle → peritoneum. Peritoneum (option D) lies below longitudinal muscle, not directly below circular muscle.
Q10Earthworm
Which of the following correctly explains the hydrostatic skeleton mechanism in earthworm?
Not quite — the answer is A.
When circular or longitudinal muscles contract, the incompressible coelomic fluid transmits the pressure to other body regions, producing elongation or shortening. The cuticle is flexible, not rigid; setae aid grip, not structural support.
Q11Earthworm
The outermost layer of the body wall of earthworm is the cuticle. Which cell type secretes it?
Not quite — the answer is A.
The cuticle is secreted by the epidermis (single-layered columnar epithelium beneath it). This is a common NEET-style mechanism question that goes one step beyond simple identification.
Q12Earthworm
Which of the following combinations of features is INCORRECTLY stated about external morphology of earthworm?
Not quite — the answer is C.
Clitellum is present in segments 14–16, NOT 10–12. All other statements are correct. This is a direct NCERT factual trap where a plausible-sounding segment number is substituted.
673 more questions on this chapter are waiting in the app
Every one with a detailed explanation, plus flashcards and chapter tests.
Get RankUp on Google PlayQ13Cockroach
The compound eyes of cockroach are located on:
Not quite — the answer is D.
A pair of large compound eyes are present on the dorso-lateral sides of the head, providing a wide field of mosaic vision. They are not located on the thorax or abdomen.
Q14Cockroach
The male reproductive system of cockroach consists of:
Not quite — the answer is A.
The male system has a pair of testes (4th–6th abdominal segments) connected by vas deferens to a common ejaculatory duct. Spermatheca belongs to the female system; collateral glands are female accessory glands.
Q15Cockroach
Which of the following correctly explains why cockroach excretes uric acid rather than ammonia or urea?
Not quite — the answer is D.
Cockroach is a terrestrial organism that conserves water by excreting uric acid as a semi-solid paste — this requires minimal water for elimination. Ammonia requires large amounts of water and is toxic; urea needs moderate water. Uricotely is a key terrestrial adaptation.
Q16Cockroach
The type of circulatory system in cockroach is:
Not quite — the answer is B.
Cockroach has an open circulatory system — haemolymph is not confined to vessels but flows freely in the haemocoel. Double circulation is a vertebrate feature.
Q17Cockroach
Which of the following correctly explains why the midgut is the principal site of digestion in cockroach?
Not quite — the answer is A.
Gastric caeca, attached at the anterior midgut, secrete enzymes into the midgut, making it the main digestion site. Chitinous lining is absent in midgut (it is a distractor — foregut and hindgut have it, not midgut).
Q18Cockroach
Salivary glands in cockroach open into:
Not quite — the answer is B.
Salivary ducts open at the base of the hypopharynx in the buccal cavity. They do not open into the crop or gizzard.
Q19Frog
The small intestine of a frog consists of:
Not quite — the answer is C.
Small intestine in frog comprises the duodenum (receives bile and pancreatic juice) and ileum (primary absorption site). Rectum and colon are parts of the large intestine.
Q20Frog
The larval stage (tadpole) of a frog respires primarily through:
Not quite — the answer is D.
Tadpoles possess gills (branchial respiration) as the primary mode of respiration, analogous to fish. Lungs and skin-based respiration develop as the tadpole undergoes metamorphosis into an adult frog.
Q21Frog
Which of the following best explains why cutaneous respiration is indispensable for a frog, unlike most reptiles?
Not quite — the answer is D.
Reptile skin is dry, thick and heavily keratinised — impermeable to gases. Frog skin remains permanently moist through mucous gland secretion and is densely vascularised, making it an effective respiratory surface. Frogs cannot survive if their skin dries out.
Q22Frog
The teeth of a frog function primarily to:
Not quite — the answer is B.
Frog teeth (maxillary and vomerine) are small, conical and used only to grip prey — frogs do not chew. Food is swallowed whole. This distinguishes them from mammals with differentiated dentition.
Q23Frog
During submersion in water, entry of water through the nostrils of a frog is prevented by:
Not quite — the answer is C.
Frog nostrils are equipped with muscular valves that actively close during aquatic submersion, preventing water entry while allowing air intake on land. Nictitating membrane protects the eye, not the nostrils.
Q24Frog
Which of the following structures is absent in an adult frog?
Not quite — the answer is B.
Adult frogs lose their tail after metamorphosis from the tadpole stage. All other listed structures — tympanum, nictitating membrane, and cloaca — are present in the adult frog.
ELITE question · AIR under 50 level
This chapter has 69 ELITE questions for students aiming at the very top. They are only in the app.
Unlock ELITE questions in the appTissues and animal facts to remember
Quick revision: most questions in this chapter test these facts.
| Topic | Key fact |
|---|---|
| Squamous epithelium | Walls of blood vessels and air sacs of lungs |
| Cuboidal epithelium | Ducts of glands and tubular parts of nephrons |
| Columnar epithelium | Lining of stomach and intestine; ciliated form in bronchioles and fallopian tubes |
| Compound epithelium | Dry surface of skin, buccal cavity, pharynx, ducts of salivary glands and pancreas |
| Cell junctions | Tight junctions stop leakage; adhering junctions cement cells; gap junctions let cells communicate |
| Dense regular connective tissue | Tendons join muscle to bone; ligaments join bone to bone |
| Cartilage and bone | Cartilage: tip of nose, outer ear, between vertebrae; bone: osteocytes in lacunae, marrow makes blood cells |
| Muscle types | Skeletal (striated, voluntary); smooth (non-striated, involuntary, gut wall); cardiac (branched, intercalated discs) |
| Neural tissue | Neurons plus neuroglia; neuroglia make up more than half the volume |
| Earthworm (Pheretima) | Clitellum on segments 14–16; female pore on 14th, male pores on 18th; gizzard in segments 8–9; typhlosole from 26th segment |
| Cockroach (Periplaneta americana) | Gastric caeca at foregut–midgut junction; Malpighian tubules at midgut–hindgut junction; 13-chambered heart; ootheca |
| Cockroach: male vs female | Anal styles only in males; anal cerci in both sexes |
| Frog (Rana tigrina) | Cold-blooded; three-chambered heart (two atria, one ventricle); nictitating membrane; tympanum; cloaca |
| Frog respiration | Skin in water; lungs on land; tadpoles breathe through gills |
What the app covers in this chapter
697 questions in total, each with a detailed explanation.
| Animal Tissues | 121 |
| Earthworm | 175 |
| Cockroach | 100 |
| Frog | 101 |
| Mixed practice and chapter tests | 200 |
Questions students ask
Is Structural Organisation in Animals important for NEET?
Yes. The animal tissues section appears regularly, and questions on the cockroach and frog test very precise NCERT facts. Because the facts are specific, they are easy marks once memorised.
Which topics should I revise first?
Start with where each epithelium and connective tissue is found, then the three muscle types, and finally the numbers and positions in the cockroach and frog (use the table on this page).
How many questions from this chapter are on RankUp?
The RankUp app has 697 questions on Structural Organisation in Animals, including 69 ELITE questions written for students aiming at AIR under 50. Every question has a detailed explanation.
Can I download these questions as a PDF?
Yes. The free PDF on this page has all 24 questions with the answer key and explanations. No signup is needed.
