Home
Class 12
BIOLOGY
Last segment of Nereis bears (a) Tentacl...

Last segment of Nereis bears
(a) Tentacles
(b) Parapodia
(c) Anal cirri
(d) Penial spicules

A

Tentacles

B

Parapodia

C

Anal cirri

D

Penial spicules.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the last segment of Nereis, we will analyze each option provided: 1. **Understanding Nereis**: Nereis is an aquatic annelid, which can be found in both freshwater and marine environments. The body of Nereis is divided into three main regions: the head, the trunk, and the pygidium (the last segment). 2. **Analyzing the Options**: - **(a) Tentacles**: Tentacles are found in the head region of Nereis, specifically in the peristomial and prostomial areas. Therefore, tentacles are not present in the last segment. - **(b) Parapodia**: Parapodia are lateral extensions found on each segment of the body, including the trunk. While they are present throughout the body, they are not specifically characteristic of the last segment. - **(c) Anal cirri**: Anal cirri are structures that are specifically located at the last segment (pygidium) of Nereis. They are associated with the anus and are indeed present in the last segment. - **(d) Penial spicules**: Penial spicules are involved in reproduction but are not located in the last segment; they are embedded in the cuticle and not associated with the pygidium. 3. **Conclusion**: Based on the analysis, the last segment of Nereis bears **(c) Anal cirri**. ### Final Answer: (c) Anal cirri
Promotional Banner

Topper's Solved these Questions

  • PHYLUM - ANNELIDA

    DINESH PUBLICATION ENGLISH|Exercise Revision Question From Compretitive Exams.|38 Videos

  • PHYLUM - ANNELIDA

    DINESH PUBLICATION ENGLISH|Exercise Check your grasp|10 Videos

  • PHOTOSYNTHESIS

    DINESH PUBLICATION ENGLISH|Exercise CYG|10 Videos

  • PHYLUM - ARTHROPODA

    DINESH PUBLICATION ENGLISH|Exercise CYG|20 Videos

Similar Questions

Explore conceptually related problems

The segmental appendages of Nereis are (a) Tentacles (b) Setae (c) Suckers (d) Parapodia

Angle formed in minor segment of a circle is (a) acute (b) obtuse (c) right angle (d) none of these

Nereis is (a) Carnivorous (b) Herbivorous (c) Sanguivorous (d) Parasitic

Wisdom teeth are (a) last molars (b) last premolars (c) incisors (d) canines

Body is segmented in (a) Arthropoda (b) Cnidaria (c) Annelida (d) Both (a) and (c)

The figure formed by two rays with the same initial point is know as (a) a ray (b) a line (c) an angle (d) a line segment

Loss or gain of a segment of DNA results in (a) frame-shift mutation (b) point mutation (c) polyploidy (d) chromosomal aberration

Locomotion occurs in Sandworm or Nereis through (a) Chaetae (b) Setae (c) Legs (d) Parapodia

Tentacles are absent in (a) Beroe (b) Ctenoplane (c) Hormiphora (d) Obelia

Read the following characters carefully (a) Organ system level of organisation (b) Sexes are separate (c) Internal fertilization (d) Bilateral symmetry (e)Pseudocoelomate How many animals given below consists of all the characters mentioned above a , b , c , d and e ? Ascaris , Ancyclostoma , Nereis , Earthworm , Taenia , Liver fluke