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Test: Earthworm - 2


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Test: Earthworm - 2 - Question 1

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

Detailed Solution for Test: Earthworm - 2 - Question 1

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.

Test: Earthworm - 2 - Question 2

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

Detailed Solution for Test: Earthworm - 2 - Question 2

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

Test: Earthworm - 2 - Question 3

Which of these statements is true about nerve ring?

Detailed Solution for Test: Earthworm - 2 - Question 3

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.

Test: Earthworm - 2 - Question 4

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

Detailed Solution for Test: Earthworm - 2 - Question 4

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.

Test: Earthworm - 2 - Question 5

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

Detailed Solution for Test: Earthworm - 2 - Question 5

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.

Test: Earthworm - 2 - Question 6

How many testes does Pheretima possess?

Detailed Solution for Test: Earthworm - 2 - Question 6

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

Test: Earthworm - 2 - Question 7

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

Detailed Solution for Test: Earthworm - 2 - Question 7

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.

Test: Earthworm - 2 - Question 8

What is the role of spermathecae?

Detailed Solution for Test: Earthworm - 2 - Question 8

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.

Test: Earthworm - 2 - Question 9

How many ovaries are present in an earthworm?

Detailed Solution for Test: Earthworm - 2 - Question 9

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

Test: Earthworm - 2 - Question 10

In earthworms, ovarian funnels open into the ______

Detailed Solution for Test: Earthworm - 2 - Question 10

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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