Structural Organisation in Animals Test

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Structural Organisation in Animals Test - 29

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Question 1
1 / -0

Main function of phorphyrin pigment present in earthworm

A
Help in respiration

B
Helps in reproduction

C
Makes the worm beautiful

D
Protection from adverse effects of sun

Solution

The porphyrin pigment present in the body of earthworm provides protection against harmful rays (ultraviolet) of sun and thus prevents its adverse effects. So, the correct answer is option D.
Question 2
1 / -0

Type of body cavity (coelom) in earthworm is

A
Acoelomic

B
Schizocoel

C
Haemocoel

D
Enterocoelic

Solution

Earthworm consists of a schizocoel type of body coelom in which the cavity is formed by splitting of embryonic mesoderm.
Acoelomic animals have no body cavity at all and the organs are in direct contact with the epithelium.
Haemocoel is a body cavity that normally contains blood and functions as part of the circulatory system.
Enterocoel is the cavity that develops from the pockets of the endodermis. It is found in entercoelomates.
So, the correct answer is option B.
Question 3
1 / -0

Which structure in earthworm is capable of secreting hormones?

A
Nerve cord

B
Lymph gland

C
Cerebral ganglia

D
Chloragogen cells

Solution

The nerve cord and cerebral ganglia present in the body of an earthworm is an important component in the nervous system of earthworm and plays an important in the transmission of sensory and motor impulse. The secretion of lymph glands plays an important role in the destruction of bacteria. Chloragogen cells stores extra glucose as glycogen and help in neutralising the toxins. So, the correct answer is option D.
Question 4
1 / -0

Complete digestion takes place in which part of cockroach?

A
In crop

B
In Gizzard

C
In stomach

D
In oesophagous

Solution

Cockroaches belong to phylum Arthropoda which has well developed the digestive system. The digestion of starch in the buccal cavity is followed by complete grinding of food in crop and gizzard which finally enters the stomach. The digestive enzymes secreted by the gastric caeca act upon the food in the stomach. These enzymes include amylase, maltase, invertase, tryptase and lipase. The remaining carbohydrates, proteins and fats are digested here.The digested food is absorbed through the stomach walls into the surrounding space which is called the haemocoel. The haemocoel consists of a large number of fat bodies which are fat cells having fat globules, protein granules and glycogen. They form storage structures which transport to different parts of the body. So, the correct answer is option C.
Question 5
1 / -0

In earthworm, neurons are

A
Motor

B
Sensory

C
Adjustor

D
All of the above

Solution

The nervous system of earthworm consists of central, peripheral and sympathetic nervous system. The central nervous system consists of two ganglia, which are connected with the nerve cord. It consists of a motor, sensory and adjustor neurons. Sensory neurons carry the information from the effector organ to the brain and the brain transmits the signals to the effector organ by motor nerves. Adjuctor neurons are the connecting link between sensory and motor. So, the correct answer is option D.
Question 6
1 / -0

The body cavity of cockroach is called as

A
Pseudocoel

B
Coelom

C
Haemocoel

D
Hydrocoel

Solution

Body cavity of cockroach is known as haemocoel, as it remains filled with haemolymph (blood). The coelom that is, haemocoel is divided into 3 main sinuses by a dorsal and ventral horizontal diaphragm:
-Pericardial sinus (surrounding the heart and aorta)
-Perivisceral sinus (surrounding the various visceral organs)
-Perineural sinus ( surrounding the ventral nerve cord)
Pseudocoel is the body cavity of certain invertebrate metazoan animals between the body wall and the intestine, which is not lined with a mesodermal epithelium.
Coelom is the body cavity of higher metazoans, between the body wall and intestine, lined with a mesodermal epithelium.
Hydrocoel is the accumulation of serous fluid in a body sac.
Therefore, the correct answer is option C.
Question 7
1 / -0

Bacteria present in the body surface of earthworm are destroyed

A
By excretory substance secreted by nephridia

B
By coelomic fluid

C
By antibodies

D
By saliva

Solution

Coelomic fluid consists of phagocytes, mucocytes, circular and chloragogen cells. The amoebocytes are numerous in number and serve as phagocytes. These play an important role in the destruction of bacteria on the body surface of an earthworm. So, the correct answer is option B.
Question 8
1 / -0

Earthworm contains blood pigment, known as

A
Haemoglobin

B
Haemocyanin

C
Haematin

D
Melanin

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 A.
Question 9
1 / -0

Lateral oesophageal heart connects

A
Dorsal vessel and ventral vessel

B
Supra oesophageal vessel and lateral oesophageal vessel

C
Dorsal vessel, supra oesophageal vessel and ventral vessel

D
Dorsal vessel and subneural vessel

Solution

The earthworm has a closed circulatory system which consists of blood, blood vessels and heart. The hearts present in the 12 $^{th}$ and 13 $^{th}$ segment in the body of earthworm are known as lateral oesophageal hearts. The dorsal vessel is the longest vessel that extends through out the body of earthworm and lies above the alimentary canal. The ventral vessel is located below the alimentary canal at an anteroposterior position. Supra-oesophageal vessel lies on the stomach in the median position. Thus, lateral oesophageal heart connects the above three vessels.
So, the correct answer is option C.
Question 10
1 / -0

Earthworm increases the

A
Salanity of soil

B
Acidity of soil

C
Fertility of soil

D
All of the above

Solution

Earthworms have the habit of making burrows by swallowing the earth, which leads to ploughing and manuring of soils. Burrows make the soil porous, improve drainage and help in root penetration, borrowing leads to turning over the soil. Their castings reduce both acidity and alkalinity of soil and make the soil fertile.So, the correct answer is option C.

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Structural Organisation in Animals Test - 29

Result

Structural Organisation in Animals Test - 29

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SHARING IS CARING

Question 1

Help in respiration

Helps in reproduction

Makes the worm beautiful

Protection from adverse effects of sun

Solution

Question 2

Acoelomic

Schizocoel

Haemocoel

Enterocoelic

Solution

Question 3

Nerve cord

Lymph gland

Cerebral ganglia

Chloragogen cells

Solution

Question 4

In crop

In Gizzard

In stomach

In oesophagous

Solution

Question 5

Motor

Sensory

Adjustor

All of the above

Solution

Question 6

Pseudocoel

Coelom

Haemocoel

Hydrocoel

Solution

Question 7

By excretory substance secreted by nephridia

By coelomic fluid

By antibodies

By saliva

Solution

Question 8

Haemoglobin

Haemocyanin

Haematin

Melanin

Solution

Question 9

Dorsal vessel and ventral vessel

Supra oesophageal vessel and lateral oesophageal vessel

Dorsal vessel, supra oesophageal vessel and ventral vessel

Dorsal vessel and subneural vessel

Solution

Question 10

Salanity of soil

Acidity of soil

Fertility of soil

All of the above

Solution

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