(a)
Prostomium |
Peristomium |
Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function. |
The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening. |
(b)
Septal nephridium |
Pharyngeal nephridium |
They are present on both sides of inter-segmental septa behind the 15thsegment and they open into the intestine. |
They are present as three paired tufts in the fourth, fifth, and sixth segments. |
Define a taxon. Give some examples of taxa at different hierarchical levels.
What are the steps involved in formation of a root nodule?
Mention the ploidy of the following:
protonemal cell of a moss;
primary endosperm nucleus in dicot,
leaf cell of a moss;
prothallus cell of a fern;
gemma cell in Marchantia;
meristem cell of monocot,
ovum of a liverwort, and
zygote of a fern.
Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?
What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
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