Structural Organisation in Animals Test 4

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Structural Organisation in Animals Test 4

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following does the nervous system of the earthworm not contain?

A
Nerve ring

B
Nerve cord

C
Ganglia

D
Brain

Solution

The nervous system of the earthworm contains ganglia arranged on the nerve cord. It is present on the ventral side of the body. The nerve ring is present on the dorsal side. It is made of the nerve cord and cerebral ganglia.
Question 2
1 / -0

At which of these segments does the nerve cord of the earthworm divide into two parts?

A
5th, 6th

B
8th, 9th

C
3rd, 4th

D
11th, 12th

Solution

The nerve cord of the earthworm bifurcates or divides into two parts at the 3^rd and 4^th segments. It then encircles the pharynx and forms the nerve ring by combining with the cerebral ganglia.
Question 3
1 / -0

Which of these statements is true about nerve ring?

A
It has only sensory function

B
It has only motor function

C
It is present on the dorsal side

D
It is present on the ventral side

Solution

The nerve ring is present on the dorsal side of the body of the earthworm. It is made of the nerve cord which combines with the cerebral ganglia. The nerve ring has both sensory and motor functions.
Question 4
1 / -0

Which of these is not a function of the sensory system of earthworms?

A
Visualize food

B
Distinguish light intensities

C
Detect vibrations

D
React to chemical stimuli

Solution

The sensory system of earthworm lacks eyes. Hence, the earthworm cannot visualize its food. However, it contains receptor cells which helps it to detect vibrations, changes in light intensities and allows it to react to chemical stimuli.
Question 5
1 / -0

Which of these statements regarding the sensory system of earthworm is false?

A
Eyes are absent

B
The sense organs are located posteriorly

C
Taste receptors are present

D
Receptor cells help to detect vibrations

Solution

The sense organs of the earthworm are located on the anterior side of the body. Eyes are absent. It contains taste receptors or chemoreceptors. The receptor cells allow the earthworm to detect vibrations and changes in light intensity.
Question 6
1 / -0

How many testes does Pheretima possess?

A
1

B
2

C
4

D
6

Solution

Pheretima or earthworm possesses 4 testes, that is, two pairs. They are present in the 10^th and 11^th segment. The earthworm is hermaphrodite. Hence, it also possesses female reproductive structures.
Question 7
1 / -0

The common prostate and spermatic duct of earthworms is known as ________

A
vasa deferentia

B
vasa efferentia

C
spermathecae

D
oviduct

Solution

Vasa deferentia is the common prostate and sperm duct of earthworms. Vasa efferentia is absent. Spermathecae store spermatozoa during copulation. Oviduct is a part of the female reproductive system.
Question 8
1 / -0

What is the role of spermathecae?

A
Sperm is produced here at the time of mating

B
It is an accessory organ

C
It is vestigial

D
It stores spermatozoa during mating

Solution

The spermathecae stores spermatozoa during mating. Four pairs of spermathecae are present in earthworms. They occur in segments 6 to 9. It is not an accessory organ. It is not a vestigial organ.
Question 9
1 / -0

How many ovaries are present in an earthworm?

A
4

B
1

C
2

D
6

Solution

The earthworm possesses one pair, that is, two ovaries. They are attached at the septum between the 12^th and 13^th segments. Egg cells or ova are formed which subsequently get fertilized to zygotes during fertilization.
Question 10
1 / -0

In earthworms, ovarian funnels open into the ______

A
spermathecae

B
female genital pore

C
ovary

D
oviduct

Solution

In the body of earthworms, the ovarian funnels are present below the ovaries. The ovarian funnels open up into the oviduct and join together. They lead to an opening on the ventral side known as the female genital pore.

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Structural Organisation in Animals Test 4

Result

Structural Organisation in Animals Test 4

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SHARING IS CARING

Question 1

Nerve ring

Nerve cord

Ganglia

Brain

Solution

Question 2

5th, 6th

8th, 9th

3rd, 4th

11th, 12th

Solution

Question 3

It has only sensory function

It has only motor function

It is present on the dorsal side

It is present on the ventral side

Solution

Question 4

Visualize food

Distinguish light intensities

Detect vibrations

React to chemical stimuli

Solution

Question 5

Eyes are absent

The sense organs are located posteriorly

Taste receptors are present

Receptor cells help to detect vibrations

Solution

Question 6

1

2

4

6

Solution

Question 7

vasa deferentia

vasa efferentia

spermathecae

oviduct

Solution

Question 8

Sperm is produced here at the time of mating

It is an accessory organ

It is vestigial

It stores spermatozoa during mating

Solution

Question 9

4

1

2

6

Solution

Question 10

spermathecae

female genital pore

ovary

oviduct

Solution

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