Structural Organisation in Animals Test

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Structural Organisation in Animals Test - 81

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is exonephric nephridia?

A
Pharyngeal nephridia

B
Septal nephridia

C
Integumentary nephridia

D
Integumentary and pharyngeal nephiridia

Solution

Nephridia are the major excretory organs which help to remove the metabolic waste. Integumentary nephridia lie scattered on the entire inner or parietal surface of body wall in each segment, except the first two. There are 200-250 nephridia in each segment. Integumentary nephridia are V-shaped and lack nephrostomes. Their terminal duct opens on body surface independently through minute openings, known as nephridiopore. They are thus known as exonephric. So, the correct option is C.
Question 2
1 / -0

The flow of blood in the dorsal blood vessel of earthworm is

A
Backwards

B
Forwards

C
Backwards in half and forward in other half

D
None of the above

Solution

The dorsal blood vessel of an earthworm is the largest and the most prominent, which rises along the mid-dorsal line above the alimentary canal and extends throughout the length of the body. The walls of this blood vessel are thick and muscular. The flow of the blood is posteroanterior or forward. So, the correct answer is option B.
Question 3
1 / -0

In earthworm two pairs of heart are found in segments of one side only of

A
9, 10, 14 and 15

B
7, 9, 12 and 13

C
6, 7, 9 and 10

D
None of the above

Solution

There are four pairs of valvular, muscular and pulsatile hearts situated in the 7th, 9th, 12th and 13th segments. Out of these four pairs, the two anterior ones of the 7th and 9th are called as lateral hearts, while those of 12th and 13th segments are called as latero-esophageal hearts. So, the correct answer is option B.
Question 4
1 / -0

In which animal, blood is red but blood corpuscles are absent?

A
Cockroach

B
Earthworm

C
Birds

D
Bedbug

Solution

In earthworms, the blood vascular system is of closed type. The blood of earthworm is red and haemoglobin is found dissolved in the blood plasma. RBCs are absent in them. The aortic arches, dorsal blood vessels, and ventral blood vessels are three major blood vessel for circulation of blood. So, the correct answer is option B.
Question 5
1 / -0

Which of the following is the character of dorsal blood vessel of earthworm?

A
Collecting in the other body segments

B
Collecting in first $$13 ^{th}$$ segments

C
Distributing in the first $$13 ^{th}$$ segments

D
Both A and C

Solution

The aortic arches, dorsal blood vessels, and ventral blood vessels are three major blood vessel for circulation of blood. Dorsal blood vessels of an earthworm are blood vessels situated in the rear part of an earthworm. They collect the blood in the other body segment and distribute in the first 13 segments.
So, the correct answer is option D.
Question 6
1 / -0

Blood from seminal vesicles and gonads is collected by

A
Dorsal vessel

B
Ventral vessel

C
Subneural vessel

D
Lateral esophageal vessel

Solution

In earthworm, the sub-neural vessel in the 14$$^{th}$$ segment divides into two lateral-esophageal vessels running on the lateral sides of the stomach and esophagus in close contact. The blood is collected by the lateral esophageal vessels from gonads and seminal vesicle and is put into the supra-esophageal vessel through these loops.
So, the correct answer is option D.
Question 7
1 / -0

Which of the following pigment is found in the blood of Pheretima?

A
Haemoglobin

B
Haemocyanin

C
Erythrocruorin

D
Both A and C

Solution

A) Haemoglobin is a protein present in RBCs that carries oxygen. It is an iron-containing molecule that provides red colour to blood.
B) Haemocyanin is a molecule used by various invertebrates to carry oxygen throughout their bodies and uses copper instead of iron. It is found in snails, spiders, and lobsters. The presence of copper ions in blood gives blood a blue colour.
C) Erythrocruorin is an enormous molecule of haemoglobin found in annelids like Pheretima that is used to carry oxygen to various parts of the body.
So, the correct option is 'Both A and C'.
Question 8
1 / -0

Which statement is true about earthworm?

A
Blood is blue

B
Blood is red but haemoglobin is dissolved in plasma

C
Blood pigment is haemocyanin

D
Blood is red but haemoglobin is dissolved in RBC's

Solution

In earthworms, the blood vascular system is of closed type. The blood of earthworm is red and haemoglobin is found dissolved in the blood plasma. RBCs are absent in them. So, the correct answer is option B.
Question 9
1 / -0

Pharyngeal nephridia of Pheretima are found in segments

A
6,7 and 8

B
5, 6 and 7

C
3, 4 and 5

D
4, 5 and 6

Solution

The pharyngeal nephridia are found in paired tufts in 4th, 5th and 6th segments around the oesophagus. Each nephridial tuft is composed of numerous nephridia, which open into a common excretory duct. So, there are three pairs of the pharyngeal excretory duct. So, the correct answer is option D.
Question 10
1 / -0

Excretory organs in earthworm are

A
Flame cells

B
Nephridia

C
Malpighian tubules

D
Skin

Solution

The Pheretima or earthworm has a well-developed excretory system, which is composed of a large number of minute, coiled and glandular segmentally arranged excretory tubules, called as the nephridia. Flame cells are excretory cells in simplest freshwater invertebrates. Malpighian tubules is a type of excretory system in some arachnids. So, the correct answer is option B.

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Re-Attempt Weekly Quiz Competition

Structural Organisation in Animals Test - 81

Result

Structural Organisation in Animals Test - 81

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SHARING IS CARING

Question 1

Pharyngeal nephridia

Septal nephridia

Integumentary nephridia

Integumentary and pharyngeal nephiridia

Solution

Question 2

Backwards

Forwards

Backwards in half and forward in other half

None of the above

Solution

Question 3

9, 10, 14 and 15

7, 9, 12 and 13

6, 7, 9 and 10

None of the above

Solution

Question 4

Cockroach

Earthworm

Birds

Bedbug

Solution

Question 5

Collecting in the other body segments

Collecting in first $$13 ^{th}$$ segments

Distributing in the first $$13 ^{th}$$ segments

Both A and C

Solution

Question 6

Dorsal vessel

Ventral vessel

Subneural vessel

Lateral esophageal vessel

Solution

Question 7

Haemoglobin

Haemocyanin

Erythrocruorin

Both A and C

Solution

Question 8

Blood is blue

Blood is red but haemoglobin is dissolved in plasma

Blood pigment is haemocyanin

Blood is red but haemoglobin is dissolved in RBC's

Solution

Question 9

6,7 and 8

5, 6 and 7

3, 4 and 5

4, 5 and 6

Solution

Question 10

Flame cells

Nephridia

Malpighian tubules

Skin

Solution

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