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NEET • BIOLOGY • STRUCTURAL ORGANISATION IN ANIMALS

Structural organisation in animals practice · Hard

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Showing 1-30 of 78 questions

1 Hard

1 of 78

Remembering +4 | -1

The outermost wall of spermatophore of cockroach is composed of the secretions of

View answer and explanation

Correct option: B

Conglobate gland

Option B (Conglobate gland) is correct because the outermost wall of the cockroach spermatophore is formed by secretions from the conglobate gland.

2 Hard

2 of 78

Understanding +4 | -1

The white adipose tissue appears opaque due to

View answer and explanation

Correct option: C

large number of adipocytes

Option C (large number of adipocytes) is correct because the opacity of white adipose tissue is due to the high concentration of fat-filled adipocytes.

3 Hard

3 of 78

Analyzing +4 | -1

Consider the following statements about respiratory system of frog
I. Skin acts as a respiratory organ in water as well as on land
II. Dissolved oxygen is exchanged through the skin by the process of diffusion in water
III. Lungs are paired and present in thorax
IV. Gaseous exchange takes place through the skin during hibernation and aestivation
Which of the statements given above is are incorrect?

View answer and explanation

Correct option: A

Only I

Option A (Only I) is correct because the skin of a frog acts as a respiratory organ in water, but not primarily on land.

4 Hard

4 of 78

Remembering +4 | -1

Achondroplasia is a disease related with the defect in the formation of

View answer and explanation

Correct option: B

cartilage

Option B (cartilage) is correct because achondroplasia is a genetic disorder that primarily affects cartilage formation, leading to impaired bone growth and dwarfism.

5 Hard

5 of 78

Remembering +4 | -1

Which structure is not related to respiration in frog?

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Correct option: A

Diaphragm

Option A (Diaphragm) is correct because frogs lack a diaphragm; they use buccal cavity, skin, and lungs for respiration.

6 Hard

6 of 78

Understanding +4 | -1

Read the following statements
(a) Heart consist of all the four types of tissues i.e epithelial, connective, muscular and neural
(b) Each organ in our body is made of one or more types of tissues
(c) Bones have a hard and non-pliable ground substance
(d) Gap junctions allow rapid transfer of ions, small molecules and sometimes big molecules
How many statement(s) are incorrect?

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Correct option: A

Zero

Option A (Zero) is correct because all the statements are factually correct regarding tissue types and their characteristics in multicellular animals.

7 Hard

7 of 78

Understanding +4 | -1

Statement I: During copulation, two earth worms mutually exchange spermatophores:
Statement II: Sperms are temporarily stored in the spermathecae

View answer and explanation

Correct option: A

Both statement I and II are correct

Option A (Both statement I and II are correct) is correct because earthworms mutually exchange spermatophores during copulation, and sperms are temporarily stored in the spermathecae.

8 Hard

8 of 78

Understanding +4 | -1

Which of the following statements is false about
the glands?

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Correct option: D

Endocrine glands secrete a variety of
enzymes only.

Option D (Endocrine glands secrete a variety of enzymes only) is correct because endocrine glands secrete hormones, not just enzymes.

9 Hard

9 of 78

Understanding +4 | -1

Aging of an animal body is associated with deterioration in its

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Correct option: A

connective tissue

Option A (connective tissue) is correct because aging is primarily associated with the deterioration of connective tissues, affecting structural support and elasticity.

10 Hard

10 of 78

Remembering +4 | -1

What type of animal tissue changes a blood vessel’s diameter?

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Correct option: C

Muscle

Option C (Muscle) is correct because muscle tissue, specifically smooth muscle in the walls of blood vessels, controls the diameter through contraction and relaxation.

11 Hard

11 of 78

Remembering +4 | -1

Transparent part of human nail is made up of

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Correct option: A

Living protein eledein

Option A (Living protein eledein) is correct because the transparent part of the nail is made of eleidin, a living protein.

12 Hard

12 of 78

Understanding +4 | -1

This feature is not found in Periplaneta Americana

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Correct option: A

During embryonic development, indeterminate and radial cleavage occur

Option A (During embryonic development, indeterminate and radial cleavage occur) is the feature not found in Periplaneta Americana because insects exhibit determinate and spiral cleavage.

13 Hard

13 of 78

Remembering +4 | -1

Ecdysone is produced by

View answer and explanation

Correct option: A

Prothoracic gland

Option A (Prothoracic gland) is correct because ecdysone, the molting hormone, is produced by the prothoracic gland in insects.

14 Hard

14 of 78

Understanding +4 | -1

Which of the following statement(s) is/are correct regarding compound epithelium?

View answer and explanation

Correct option: D

All of the above.

Option D (All of the above) is correct because all the statements accurately describe the characteristics and functions of compound epithelium.

15 Hard

15 of 78

Remembering +4 | -1

Which type of mouthparts is present on the lateral side of the pre-oral cavity in cockroach?

View answer and explanation

Correct option: A

Labrum and mandibles

Option A (Labrum and mandibles) is correct because the labrum and mandibles are located on the lateral side of the pre-oral cavity in cockroaches.

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16 Hard

16 of 78

Remembering +4 | -1

Tissue that contains fat globules is known as:

View answer and explanation

Correct option: B

adipose tissue

Option B (adipose tissue) is correct because adipose tissue is the type of connective tissue primarily composed of fat cells (adipocytes).

17 Hard

17 of 78

Remembering +4 | -1

What is sprain?

View answer and explanation

Correct option: C

More pulling of ligament

Option C (More pulling of ligament) is correct because a sprain is defined as the overstretching or tearing of ligaments, which connect bones to each other at a joint.

18 Hard

18 of 78

Understanding +4 | -1

The function of gap junctions is to

View answer and explanation

Correct option: B

Facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules etc.

Option B is correct because gap junctions facilitate communication between cells by connecting their cytoplasm for rapid transfer of ions and small molecules.

19 Hard

19 of 78

Remembering +4 | -1

Which type of epithelium is present in Vas deferentia?

View answer and explanation

Correct option: C

Pseudo Stratified Columnar epithelium

Option C (Pseudo Stratified Columnar epithelium) is correct because vas deferentia are lined with pseudo stratified columnar epithelium, often with stereocilia.

20 Hard

20 of 78

Understanding +4 | -1

Assertion (A): When one cell of cardiac muscle receives a signal to contract, its neighbour cells are also stimulated to contract.

Reason (R): There is presence of communicating junctions (intercalated discs) at some fusion points between muscle fibres.

In light of above statements, choose the correct option.

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A (Both (A) and (R) are true and (R) is the correct explanation of (A)) is correct because intercalated discs facilitate rapid signal transmission in cardiac muscle.

21 Hard

21 of 78

Remembering +4 | -1

Silicates consumed along with food by Pheretima and excreted by–

View answer and explanation

Correct option: B

chloragogen cells

Option B (chloragogen cells) is correct because these cells in earthworms are responsible for storing and excreting waste products, including silicates.

22 Hard

22 of 78

Understanding +4 | -1

Which of the following statement(s) is/are correct about muscle tissue?

View answer and explanation

Correct option: D

All of the above

Option D is correct because all the statements accurately describe the structure, function, and properties of muscle tissue.

23 Hard

23 of 78

Remembering +4 | -1

Which of the following vertebrates show the formation of middle ear (eustachian recess) for the first time?

View answer and explanation

Correct option: B

Rana

Option B (Rana) is correct because amphibians like Rana (frogs) are the first vertebrates to develop a middle ear cavity (eustachian recess).

24 Hard

24 of 78

Remembering +4 | -1

The intercellular material of cartilage is

View answer and explanation

Correct option: C

Solid, pliable and resists compression

Option C (Solid, pliable and resists compression) is correct because cartilage is a solid, yet flexible tissue that provides support and resists compressive forces.

25 Hard

25 of 78

Understanding +4 | -1

Which is not correct?

View answer and explanation

Correct option: A

Ovaries matured first in earthworm

Option A (Ovaries matured first in earthworm) is not correct because in earthworms, protandry is observed, meaning testes mature before ovaries.

26 Hard

26 of 78

Remembering +4 | -1

Blood of earthworm is

View answer and explanation

Correct option: B

Red in colour, due to dissolved haemoglobin in plasma

Option B (Red in colour, due to dissolved haemoglobin in plasma) is correct because earthworm blood is red due to haemoglobin dissolved in the plasma.

27 Hard

27 of 78

Understanding +4 | -1

The cells of a tissue are similar in

View answer and explanation

Correct option: D

both (2) and (3)

Option D (both (2) and (3)) is correct because cells of a tissue are similar in function and origin.

28 Hard

28 of 78

Understanding +4 | -1

Read the given statements reference to the digestive system of cockroach
I. Alimentary canal is divided into three regions
II. Oesophagus opens into a sac like structure called crop
III. The hind gut is broader than mid gut
IV. The rectum opens through the anus
Which of the statements given above is/are incorrect?

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Correct option: D

None of the above

Option D (None of the above) is correct because all the statements regarding the digestive system of the cockroach are accurate.

29 Hard

29 of 78

Understanding +4 | -1

Which of the following series of events is correct about the digestive system of frog?
I. Prey → Mouth → Oesophagus → stomach → Small intestine → Cloaca
II. Prey → Mastication by teeth → Stomach → Small intestine → Cloaca
III. Tongue → Prey → Teeth → Stomach → Large intestine → Cloaca
IV. Prey → Mouth → Teeth → Pharynx → Stomach → Small intestine → Rectum

View answer and explanation

Correct option: A

Only I

Option A (Only I) is correct because it accurately describes the correct order of the digestive system in frogs.

30 Hard

30 of 78

Understanding +4 | -1

Cross fertilisation is favoured by

View answer and explanation

Correct option: D

None of these

Option D (None of these) is correct because the provided options (Neoteny, Metagenesis) do not directly favor cross-fertilization. Protandry and self-sterility are mechanisms that favor cross-fertilization.

Revision notes and key takeaways

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Key Takeaways

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