Structural Organisation in Animals (Animal Tissues)
29 solved NEET Biology previous year questions on Structural Organisation in Animals (Animal Tissues), each with the correct answer and a full explanation.
Q1
The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of:
✓ Correct answer: a) Potassium urate
ExplanationUrate cells absorb nitrogenous waste products from haemolymph and synthesise uric acid from it for storage.
Q2
Histamine secreting cells are found in:
✓ Correct answer: a) Connective tissues
ExplanationHistamine is produced by basophils and by mast cells found in connective tissue.It increases the permeability of capillaries to WBCs \& some proteins, to allow them to engage pathogens in infected tissues.
Q3
Mineral found in red pigment of vertebrate blood is:
✓ Correct answer: b) Iron
ExplanationHaemoglobin is red pigment found in blood of vertebrate.Its molecule comprises 4 subunits, each containing an iron atom bound to a haem group.
Q4
Male and female cockroaches can be distinguished externally through
✓ Correct answer: a) anal styles in male
ExplanationMale and female cockroaches show external sexual dimorphism mainly based on the presence or absence of anal styles.Male cockroach → possesses a pair of anal styles (short, unsegmented appendages near the anus).Female cockroach → does not have anal styles.Anal cerci are present in both male and female, so they cannot be used to distinguish the sexes.Antennae are also present in both sexes.Correct answer: A — anal styles in male
Q5
An epithelial tissue which has thin flat cells, arranged edge to edge so as to appear like closely packed tiles, is found to be present at:
✓ Correct answer: d) Inner lining of cheeks
ExplanationCompound stratified squamous epithelium covers moist surfaces where there is little wear and tear by friction such as inner lining of cheeks.
Q6
Characteristic of simple epithelium is:
✓ Correct answer: b) They make a definite layer
ExplanationSimple epithelium is composed of a single layer of cells and functions as lining for body cavities, ducts and tubes.
Q7
What will happen if ligaments are cut or broken?
✓ Correct answer: c) Bone will become unfix
ExplanationLigaments joins bone from another bone at the joint.Its absence may lead to improper articulation among bones and thus bone will become unfix.
Q8
Ommatidia serve the purpose of photoreception in:
✓ Correct answer: a) Cockroach
ExplanationIn cockroach, the compound eyes are situated at dorsal surface of the head and each eye consists of about 2000 hexagonal ommatidia.With the help of these ommatidia, a cockroach can receive several images of an object.
Q9
Cell junctions will be frequent in:
✓ Correct answer: d) Ciliated epithelium
ExplanationIn ciliated epithelium cells are interconnected via desmosomes and tight junctions, creating semipermeable membrane that is more selective than membrane found in other type of cells.
Q10
Lining layer of fallopian tubes, nasal passages, bronchi and bronchioles consists of:
✓ Correct answer: b) Ciliated columnar epithelium
ExplanationLining layer of fallopian tubes, nasal passages, bronchi and bronchioles consists of ciliated columnar epithelium
Q11
Cell junctions called tight, adhering and gap junctions are found in:
✓ Correct answer: d) Epithelial tissue
ExplanationAll animal tissues have specialised junctions which providing structural and functional link between its individual cell.E.g., tight, adhering, gap junction.All three of them present in epithelium.
Q12
Frogs differ from humans in possessing:
✓ Correct answer: a) Nucleated red blood cells
ExplanationRBC's of frogs are nucleated and contain red coloured pigment namely haemoglobin.Mature human RBCs lack a cell nucleus and most of the organelles.
Q13
Which one of the following characteristics is common both in humans and adult frogs?
✓ Correct answer: d) Ureotelic mode of excretion
ExplanationIn human beings, some mammals and amphibians (frog, toad etc.) excess of nitrogenous waste is urea and this mode is called ureotelic mode of excretion.
Q14
Choose the correctly matched pair:
✓ Correct answer: d) Tubular parts of nephrons - Cuboidal epithelium
ExplanationTubular part of nephron - Cuboidal epithelium.Moist surface of buccal cavity \& inner lining of salivary ducts - Compound epithelium Inner surface of bronchioles - Ciliated epithelium
Q15
The terga, sterna and pleura of cockroach body are joined by:
✓ Correct answer: a) Arthrodial membrane
ExplanationIn each segment of Periplaneta americana, exoskeleton has hardened plates called sclerites (tergites dorsally and sternites ventrally) that are joined to each other by a thin and flexible articular membrane (Arthrodial membrane).
Q16
Which type of tissue correctly matches with its location? Tissue Location
✓ Correct answer: d) Smooth muscle Wall of intestine
ExplanationAreolar tissue is found in spaces between organs, not in tendons.Transitional epithelium is found in urinary bladder, not the tip of the nose.Cuboidal epithelium is found in glands and not in the lining of the stomach.Smooth muscle lines the walls of the intestine to help with peristalsis.Hence, the correct answer is option D.
Q17
Select the correct route for the passage of sperms in male frogs:
✓ Correct answer: d) Testes → Vasa efferentia → Kidney → Bidder’s canal → Urinogenital duct → Cloaca
ExplanationIn male frog the sperms will move as follows: Testes → Vasa efferentia → Kidney → Bidder’s canal → Urinogenital duct → Cloaca.
Q18
Which of the following features is used to identify a male cockroach from a female cockroach ?
✓ Correct answer: b) Presence of caudal styles
ExplanationThe correct answer is: B. Presence of caudal styles Explanation: In cockroaches, males and females can be distinguished by the presence of caudal styles, which are: Short, paired appendages found only in male cockroaches, located near the anal cerci on the 9th abdominal segment.Function: They are sensory structures that may play a role in mating.
Q19
If the head of cockroach is removed, it may live for few days because:
✓ Correct answer: b) The head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
ExplanationThe head of cockroach holds a bit of nervous system while the rest is situated along the ventral (belly-side) part of its body.So, if the head of the cockroach is cut off, it will still live for as long as one week.
Q20
Select the incorrectly matched pair from following: [Re-NEET 2020]
✓ Correct answer: d) Chondrocytes - Smooth muscle cells
ExplanationThe intercellular material of cartilage is solid and pliable and resists compression.Cells of this tissue (chondrocytes) are enclosed in small cavities within the matrix secreted by them.
Q21
In cockroach, identify the parts of the foregut in correct sequence. [Re-NEET 2020]
✓ Correct answer: c) Mouth Pharynx Oesophagus Crop Gizzard
ExplanationThe mouth opens into a short tubular pharynx, leading to a narrow tubular passage called oesophagus.This in turn opens into a sac like structure called crop used for storing of food.The crop is followed by gizzard or proventriculus.
Q22
Which of the following characteristics is incorrect with respect to cockroach? [NEET 2021]
✓ Correct answer: d) A ring of gastric caeca is present at the junction of midgut and hind gut.
ExplanationIn cockroach, a ring of 6-8 blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut, which secrete digestive juice.
Q23
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.
✓ Correct answer: a) Tight junctions and Gap junctions, respectively.
ExplanationTight junctions help to stop substances from leaking across a tissue.Adhering junctions perform cementing to keep neighbouring cells together.Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules.
Q24
Which of the following types of epithelium is present in the bronchioles and Fallopian tubes?
✓ Correct answer: d) Ciliated epithelium
ExplanationThe type of epithelium present in the bronchioles and fallopian tubes is ciliated epithelium, which helps in moving mucus out of the bronchioles and in moving the egg towards the uterus in the fallopian tubes.
Q25
Choose the correct statement about a muscular tissue.
✓ Correct answer: c) Intercalated discs allow the cardiac muscle cells to contract as a unit.
ExplanationC - Smooth muscles are uninucleate and involuntary. - Skeletal muscle fibres are multinucleated and found in parallel bundles. - Wall of blood vessels is lined by simple squamous epithelial tissue.
Q26
Which of the following is not a connective tissue?
✓ Correct answer: a) Neuroglia
ExplanationThe correct answer is option A Explaination Neuroglia is a neural tissue.It makes up more than onehalf the volume of neural tissue in our body.Blood and cartilage are specialized connective tissue.Adipose tissue is a type of loose connective tissue located mainly beneath the skin.
Q27
Which of the following is present between the adjacent bones of the vertebral column?
✓ Correct answer: c) Cartilage
ExplanationCartilage is a type of specialised connective tissue.The intercellular material of cartilage is solid and pliable and resists compression.Cartilage is present in the tip of nose, outer ear joints, between adjacent bones of the vertebral column, limbs and hands in adults.The smooth muscle fibres taper at both ends (fusiform) and do not show striations.The wall of internal organs such as the blood vessels, stomach and intestine contains this type of muscle tissue.Communication junctions (intercalated discs) at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.Areolar tissue is present beneath the skin.
Q28
Which of the following statements is correct about the type of junction and their role in our body? [Re-NEET 2024]
✓ Correct answer: b) Tight junctions help to stop substances from leaking across a tissue.
ExplanationTight junctions seal the space between adjacent cells, preventing leakage of substances.Adhering junctions (desmosomes) provide mechanical support by cementing cells together.Gap junctions allow communication via channels, and they do not create gaps.Tight junctions specifically maintain tissue barriers and selective permeability.
Q29
In frog, the Renal portal system is a special venous connection that acts to link: [NEET 2025]
✓ Correct answer: b) Kidney and lower part of body
ExplanationIn frogs and other lower vertebrates, a renal portal system is present.It collects venous blood from the posterior (lower) part of the body → hindlimbs, tail, etc. This blood is then carried to the kidneys before reaching the heart.Purpose → allows kidneys to filter blood directly from the lower body.
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