Question

In Polychaeta, the nature of seta is ----
a) Numerous
b) occur singly
d) fused
c) occur in bundles​

Answer 1

Answer:

(a) Numerous

Explanation:

Explanation for correct option:

Explanation for correct option:(a) Numerous

Polychaetes belong to class Annelida and they're known as segmented worms. Each member bears a brace of paddle- suchlike and largely vascularized parapodia, which bear numerous bristles, called as chaetae, which are made of chitin that's used for movement and in numerous species, act as the worm's primary respiratory shells. packets of bristles called as setae design from the parapodia.

Explanations for incorrect options:

Explanations for incorrect options:(b) Occur singly

In Polychaeta, setae is not occur singly. So, above option is incorrect.

(c) Fused

In Polychaeta, setae is not fused. So, above option is incorrect.

(d) Occur in bundles

In Polychaeta, setae is not occur in bundles. So, above option is incorrect.

Therefore, option (a) is correct.

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Answer 2

The correct answer option a) Numerous.

The phylum Annelida includes segmented marine worms called polychaetes. These worms can be identified by their setae, which are minute, bristle-like structures that are used for movement, anchoring, and defense. The setae are numerous and abound on every part of the Polychaeta worm's body. The main characteristic of setae in Polychaeta is their frequent occurrence, though they may be bundled. The setae are crucial to the worm's survival and have been adapted for their particular way of life in the marine environment. The worm's ability to move through the water, anchor itself in the sediment, and defend itself from predators depends entirely on the setae.

Overall, Polychaeta's setae are a crucial characteristic that set them apart from other subgroups of the phylum Annelida.

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