Structural Organisation in Animals Test

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Structural Organisation in Animals Test - 78

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Weekly Quiz Competition

Question 1
1 / -0

When a small piece of dorsal lip of blastopore of frog's early gastrula is transplanted into another gastrula of similar age at ventral lip, the result is

A
Death of the graft tissue

B
The host gastrula undergoes abnormal development

C
The host gastrula remains normal and unaffected

D
The graft tissue induces development of another notochord in the host

Solution

When a small piece of the dorsal lip of blastopore of frogs early gastrula is transplanted into a ventral lip, the graft tissue induces the development of another notochord in the host because it works as an inducer. So the correct answer is d.
Question 2
1 / -0

Fenestra ovalis in frog is the

A
Air-filled cavity of middle ear

B
Communication between pharynx and tympanic cavity

C
External opening of tympanic cavity covered by tympanic membrane

D
Opening of auditory capsule which separates middle ear from internal ear

Solution

The bony partition between the cavity of middle ear and the internal ear is perforated by a small window like aperture called the fenestra ovalis.
The air filled cavity in the middle ear is called the tympanic cavity. The communication between the pharynx and tympanic cavity is by the presence of the eustachian tube. The external auditory meatus is the external opening if the tympanic cavity covered by the tympanic membrane.
So, the correct option is D.
Question 3
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Read the statements regarding muscle proteins. Which of the following statement is correct?
(A) Actin is a thin filament and is made up of two F-actins.
(B) The complex protein, tropomyosin is distributed at regular intervals on the troponin.
(C) Myosin is a thick filament, which is also a polymerised protein.
D) The globular head of meromyosin consists of light meromyosin (LMM).

A
(A), (B) and (C) are correct

B
(A), (B) and (D) are correct

C
(A) and (C) are correct

D
(B) and (D) are correct

E
(B), (C) and (D) are correct

Solution

Sarcomere forms the structural and functional unit of striated muscle fibre. Each sarcomere is a bundle of fine longitudinal myofilaments of two types:
1. Primary myofilaments: They are thickened, confined to A- band only and free at both the ends. These are formed of protein myosin. Each myosin is a polymerised protein made of many monomeric proteins called meromyosin. Each meromyosin has two important parts- a globular head with a short arm and a tail, the former is called heavy meromyosin (HMM) and the latter is called (LMM).
2. Secondary myofilaments: They are thinner, occur in I-band only but extend for some distance into A-band. They are composed of protein actin having with it two regulatory proteins: tropomyosin and troponin and are attached to Z-lines on one end and are free at the other. Each actin filament is a polymerised protein made up of two 'F' (fibrous) actin strands helically wound to each other. Each 'F' actin is a polymer of monomeric 'G' (globular) actins. Two filaments of tropomyosin proteins also run along the length of 'F' actins. Also. a complex troponin protein of three globular peptides is distributed at regular intervals on the tropomyosin.
Thus, the correct answer is option C.
Question 4
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Which one of the following correctly described the location of some body parts in the earthworm Pheretima ?

A
Two pairs of accessory glands in 1618 segments

B
Two pairs of testes in $$10^{th} \,and\, 11^{th}$$ segments.

C
Four pairs of spermathecae in 47 segments

D
One pair of ovaries attached at inter segmental septum of $$14^{th} and 15^{th}$$ segments.

Solution

Two pair of testes are located at the 10th and 11th segments. These produce spermatogonia. The sac is white with wide walls and is filled with fluid. The sac is bilobed. So the correct answer is B.
Question 5
1 / -0

Medullated nerve fibre in axon is covered by

A
Neurolemma

B
Medullary sheath

C
Mitochondria

D
Both A and B

Solution

A medullated nerve fiber is also called as myelinated nerve fiber. The nerve fibers, which are covered by the myelin sheath are called as medullated nerve fibers. Myelin sheath is derived from Schwann cells. Myelin sheath is made up of alternate concentric layers of lipids and proteins. Myelinated nerve fiber also shows the presence of neurolemma. It covers the nerve fiber.
So, the correct answer is 'Both A and B'
Question 6
1 / -0

Striated muscles are found as fasciculi, which are surrounded by

A
Perimysium

B
Epimysium

C
Endomysium

D
None of the above

Solution

Skeletal muscles are usually attached to bone by tendons that are composed of connective tissue. This connective tissue also ensheaths the entire muscle and is called as epimysium. Skeletal muscles contain numerous subunits or bundles called fascicles (or fascicles). These fascicles are also surrounded by connective tissue (called the as perimysium) and each fascicle is composed of numerous muscle fibers (or muscle cells).
Thus, the correct answer is option A.
Question 7
1 / -0

Pseudo stratified epithelium is present in

A
Urinary bladder

B
Nephron

C
Larynx

D
Trachae

Solution

The conducting passageway of the respiratory system like the nasal cavity, trachea, bronchi, and bronchioles are lined by pseudostratified columnar epithelial tissue, which is ciliated. So, the correct answer is the trachea.
Question 8
1 / -0

Intercalated disc is present in___________________.

A
Striated muscle

B
Smooth muscle

C
Cardiac muscle

D
Both A and C

Solution

Cardiac muscles consist of cylindrical, branched and uninucleate myocytes which are interconnected by intercalated discs. Intercalated discs are cross-bands that separate the opposite ends of myocytes. They help to hold the adjacent cells together and transmit the force of contraction from cell to cell. These discs allow diffusion of ions across the cells due to which muscle impulses travel rapidly from cell to cell. Therefore, option C is correct.
Question 9
1 / -0

If you observe the muscular tissue of urinary bladder, you will observe

A
Striated muscle

B
Unstriated muscle

C
Ligament

D
Tendon

Solution

Contraction or relaxation of the urinary bladder is involuntary movement. When urine is formed, it is stored in the urinary bladder and its muscles are stretched. After accumulation of a certain amount of urine volume, urge of voiding is felt, as the stretched muscle send the signal to the brain. Involuntary muscles are unstriated or smooth muscles. Therefore, the correct answer is option B.
Question 10
1 / -0

Which of the following is the function of epithelial tissue?

A
Protection

B
Secretion

C
Absorption

D
All of the above

Solution

Epithelial tissue covers almost all organs and cavities in the body. The whole body is covered with skin which is a type of epithelial tissue. Skin shows layers of squamous epithelium. Such layer provides protection to the skin from wear and tear and also provides protection from pathogen invasion. In stomach, absorption and secretion takes place. Here, epithelial cell structure is changed and columnar cells formed. Therefore, option D is correct.

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Structural Organisation in Animals Test - 78

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Structural Organisation in Animals Test - 78

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Question 1

Death of the graft tissue

The host gastrula undergoes abnormal development

The host gastrula remains normal and unaffected

The graft tissue induces development of another notochord in the host

Solution

Question 2

Air-filled cavity of middle ear

Communication between pharynx and tympanic cavity

External opening of tympanic cavity covered by tympanic membrane

Opening of auditory capsule which separates middle ear from internal ear

Solution

Question 3

(A), (B) and (C) are correct

(A), (B) and (D) are correct

(A) and (C) are correct

(B) and (D) are correct

(B), (C) and (D) are correct

Solution

Question 4

Two pairs of accessory glands in 1618 segments

Two pairs of testes in $$10^{th} \,and\, 11^{th}$$ segments.

Four pairs of spermathecae in 47 segments

One pair of ovaries attached at inter segmental septum of $$14^{th} and 15^{th}$$ segments.

Solution

Question 5

Neurolemma

Medullary sheath

Mitochondria

Both A and B

Solution

Question 6

Perimysium

Epimysium

Endomysium

None of the above

Solution

Question 7

Urinary bladder

Nephron

Larynx

Trachae

Solution

Question 8

Striated muscle

Smooth muscle

Cardiac muscle

Both A and C

Solution

Question 9

Striated muscle

Unstriated muscle

Ligament

Tendon

Solution

Question 10

Protection

Secretion

Absorption

All of the above

Solution

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