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NEET • BIOLOGY • STRUCTURAL ORGANISATION IN ANIMALS

Structural organisation in animals practice · Mixed difficulty

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271 Medium

271 of 307

Understanding +4 | -1

Consider the following statements in accordance to the excretory system of the earthworm I. Nephridia is segmentally arranged coiled tubule II. Nephridia regulates the volume and composition of the body fluids III. There are three type of nephridia found in the earthworm IV. Pharyngeal nephridia is present as three paired tufts in the 4th, 5th and 6th segment Which of the above statement is/are correct?

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Correct option: D

I, II, III and IV

Option D (I, II, III and IV) is correct because all four statements accurately describe the excretory system of the earthworm.

272 Hard

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Remembering +4 | -1

Pacinian corpuscles occur in the skin of certain parts of body in mammals. These are :

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Correct option: D

encapsulated pressure receptors

Option D (encapsulated pressure receptors) is correct because Pacinian corpuscles are specialized nerve endings in the skin responsible for detecting pressure and vibrations.

273 Hard

273 of 307

Remembering +4 | -1

Cell junctions called desmosomes facilitate

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Correct option: C

Anchoring function

Option C (Anchoring function) is correct because desmosomes provide strong adhesion between cells, acting as anchors.

274 Easy

274 of 307

Remembering +4 | -1

Spiracles found in cockroach are

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Correct option: C

2 pairs in thorax and 8 pairs in abdomen

Option C (2 pairs in thorax and 8 pairs in abdomen) is correct because cockroaches have 2 pairs of spiracles in the thorax and 8 pairs in the abdomen, totaling 10 pairs.

275 Hard

275 of 307

Remembering +4 | -1

The junction between epithelial cells that prevent the leakage of body fluids

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Correct option: B

Tight junctions

Tight junctions are the junctions between epithelial cells that prevent the leakage of body fluids by creating a seal.

276 Medium

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Remembering +4 | -1

Epithelial cells of the intestine involved in food absorption have on their outer surface

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Correct option: D

Microvilli

Option D (Microvilli) is correct because microvilli are finger-like projections on the surface of intestinal epithelial cells that increase the surface area for absorption of nutrients.

277 Medium

277 of 307

Remembering +4 | -1

Which cells do not form layer and remain structurally separate?

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Correct option: C

Nerve cells

Option C (Nerve cells) is correct because nerve cells (neurons) are individual cells that are not typically arranged in layers like epithelial or gland cells, and muscle cells can be arranged in bundles but not necessarily layers.

278 Hard

278 of 307

Understanding +4 | -1

Loss of water from body occurs by all of the following except

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Correct option: A

Muscles

Option A (Muscles) is correct because muscles primarily function in movement and do not directly contribute to water loss from the body.

279 Easy

279 of 307

Remembering +4 | -1

In earthworm, self-fertilization cannot occur due to

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Correct option: B

Protandry

Option B (Protandry) is correct because earthworms exhibit protandry, where the male reproductive organs mature before the female reproductive organs, preventing self-fertilization.

280 Medium

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Remembering +4 | -1

Which one of the following is the most abundant protein in the animals ?

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Correct option: B

Collagen

Option B (Collagen) is correct because collagen is the most abundant protein in the animal body, providing structural support to various tissues and organs.

281 Easy

281 of 307

Analyzing +4 | -1

Choose the odd one w.r.t. structure present In reproductive system of female cockroach

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Correct option: D

Phallic gland

Option D (Phallic gland) is correct because the phallic gland is a structure present in the male reproductive system of cockroaches, not the female.

282 Easy

282 of 307

Understanding +4 | -1

Choose Correct sequence

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Correct option: B

\mathrm{Foregut} \to \mathrm{Midgut} \to \mathrm{Ileum} \to \mathrm{Colon} \to \mathrm{Rectum} \to \mathrm{Anus}

Option B (

\mathrm{Foregut} \to \mathrm{Midgut} \to \mathrm{Ileum} \to \mathrm{Colon} \to \mathrm{Rectum} \to \mathrm{Anus}

) is correct because this is the correct sequence of the alimentary canal in cockroaches.

283 Hard

283 of 307

Remembering +4 | -1

Tadpole’s tail is a/an

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Correct option: D

Locomotory organ

Option D (Locomotory organ) is correct because the tadpole's tail is primarily used for swimming, which is its mode of locomotion.

284 Medium

284 of 307

Understanding +4 | -1

Read the given statements about blood vascular system of cockroach
I. Circulatory system of cockroach is of closed type
II. It contains no blood vessels except aorta heart
III. Heart is 6 chambered
IV. The haemolymph is composed of colourless plasma and haemocytes
Which of the statements given above is/are incorrect

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Correct option: C

I and III

Option B (I, II and III) is correct because statements I and III are incorrect regarding the circulatory system and heart of a cockroach.

285 Medium

285 of 307

Understanding +4 | -1

Which of the cells are least likely to be replaced by new cells?

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Correct option: B

Neurons

Option B (Neurons) is correct because neurons have limited regenerative capacity compared to other cell types, making them the least likely to be replaced.

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286 Easy

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Remembering +4 | -1

Muscles involved in the movement of arm are

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Correct option: A

Striated

Option A (Striated) is correct because the muscles involved in arm movement are skeletal muscles, which are striated due to the arrangement of actin and myosin filaments.

287 Hard

287 of 307

Remembering +4 | -1

Haversian canal in the bone of mammals are connected by small blood vessel canal called

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Correct option: B

Volkmann's canal

Option B (Volkmann's canal) is correct because Volkmann's canals connect Haversian canals, allowing blood vessels and nerves to extend throughout the bone.

288 Easy

288 of 307

Understanding +4 | -1

Periplaneta has no respiratory pigment in its blood because

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Correct option: A

Air is conducted directly to the body tissues

Option A (Air is conducted directly to the body tissues) is correct because cockroaches have a tracheal system that delivers air directly to the tissues, eliminating the need for a respiratory pigment in the blood.

289 Medium

289 of 307

Remembering +4 | -1

Which one of the following is correctly matched regarding earthworm?

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Correct option: C

Typhlosole -26th to 95th segment

Option C (Typhlosole -26th to 95th segment) is correct because the typhlosole, which increases the surface area for absorption, is located in the 26th to 95th segments of the earthworm's intestine.

290 Hard

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Remembering +4 | -1

Which of the following is correct for the circulatory system of cockroach?

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Correct option: D

It is present on the dorsal side and it has ten abdominal and three thoracic units of heart

Option D (It is present on the dorsal side and it has ten abdominal and three thoracic units of heart) is correct because the cockroach heart is located dorsally and consists of 13 chambers: 10 in the abdomen and 3 in the thorax.

291 Medium

291 of 307

Remembering +4 | -1

Which of the following structures in the neural tissue carrying impulse?

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Correct option: B

Neuro fibrils

Option B (Neuro fibrils) is correct because neurofibrils are structural components within the neuron that support the cell and are involved in intracellular transport, including the movement of impulses.

292 Hard

292 of 307

Remembering +4 | -1

Embryonic connective tissue is derived from

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Correct option: D

mesenchyme

Option D (mesenchyme) is correct because embryonic connective tissue is derived from mesenchyme, a loosely organized tissue of embryonic origin.

293 Easy

293 of 307

Understanding +4 | -1

Four healthy people in their twenties got involved in injuries resulting in damage and death of few cells of the following. Which of the cells are least likely to be replaced by new cells?

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Correct option: B

Neurons

Option B (Neurons) is correct because neurons are highly specialized cells with limited regenerative capacity, making them the least likely to be replaced by new cells after damage.

294 Medium

294 of 307

Understanding +4 | -1

Common feature in both dense irregular and regular connective tissue is

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Correct option: C

Both have collagen fibers

Option C (Both have collagen fibers) is correct because both dense regular and dense irregular connective tissues are characterized by the presence of collagen fibers.

295 Hard

295 of 307

Remembering +4 | -1

Velamen tissues are associated with:

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Correct option: C

absorption of moisture

Option C (absorption of moisture) is correct because velamen tissues, found in epiphytic orchids, are specialized for absorbing moisture from the air.

296 Easy

296 of 307

Understanding +4 | -1

Gap junctions are present in all except

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Correct option: C

Skeletal muscles

Gap junctions are present in epithelial tissue, striated involuntary muscles (cardiac), and smooth muscle, but not typically in skeletal muscles.

297 Hard

297 of 307

Understanding +4 | -1

Which of the following statement(s) is/are correct regarding respiratory system of cockroach?
(i) It consists of a network of trachea, that open through 12 pairs of small holes called spiracles present on the lateral side of the body.
(ii) Thin branching tubes carry oxygen from the air to all the parts.
(iii) The opening of the spiracles is regulated by sphincters.
(iv) Exchange of gases take place at the tracheoles by diffusion.

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Correct option: C

(ii), (iii) and (iv)

Option C ((ii), (iii) and (iv)) is correct because statements (ii), (iii), and (iv) accurately describe the respiratory system of a cockroach.

298 Medium

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Remembering +4 | -1

In which type of tissue, nucleus is placed towards periphery of the cell due to storage of reserve food?

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Correct option: A

Adipose tissue

Option A (Adipose tissue) is correct because in adipose tissue, the nucleus is pushed to the periphery due to the large fat droplet stored in the cell.

299 Medium

299 of 307

Remembering +4 | -1

Which of the following component is not present in fluid connective tissue?

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Correct option: A

Fibres

Option A (Fibres) is correct because fluid connective tissue (blood and lymph) consists of cells and matrix (plasma), but it does not contain fibers in its ground substance.

300 Easy

300 of 307

Remembering +4 | -1

Hypopharynx of the cockroach acts as

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Correct option: C

Tongue

Option C (Tongue) is correct because the hypopharynx in a cockroach functions as a tongue, helping to manipulate food during feeding.

Revision notes and key takeaways

Review STRUCTURAL ORGANISATION IN ANIMALS in your textbook or class notes, then use this set to check your understanding.

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Structural organisation in animals practice · Mixed difficulty

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