Q10 of 47 Page 36

How do you distinguish between dorsal and ventral surface of the body of earthworm.

The dorsal surface of the body of earthworm has a dark dorsal median line than the ventral surface of the body of earthworm.

There is the presence of a single median per segment by which coelomic fluid comes out in the dorsal surface of the body of earthworms whereas ventral surface has various openings like genital openings.


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Why are neurons called excitable cells? Mention special features of the membrane of the neuron?

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Why earthworm is called the friend of farmer?

 11

Correct the wrong statements among the following:

a. In earthworm, a single male genital pore is present.


b. Setae help in locomotion of earthworm.


c. Muscular layer in the body wall of earthworm is made up of only circular muscles.


d. Typhlosole is the part of intestine of earthworm.


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Why nephridia in earthworm that are basically similar in structure classified into three types? Mention the names of each.