Pick up the mismatched pair

This question was previously asked in
AP Police Constable (Prelims) Official Paper (Held On: 22 Jan 2023)
View all AP Police Constable Papers >
  1. Coxal glands - Scorpions
  2. Malpighian tubules - Insects
  3. Nephridia - Prawns
  4. Flame cells - Flatworms 

Answer (Detailed Solution Below)

Option 3 : Nephridia - Prawns
Free
AP Police Constable CT : General Ability (Mock Test)
16.2 K Users
10 Questions 10 Marks 10 Mins

Detailed Solution

Download Solution PDF
The correct answer is Nephridia - Prawns

Key Points

  • Nephridia are excretory organs found in annelids (e.g., earthworms) and not in prawns.
  • Nephridia help in osmoregulation and excretion in annelids.
  • Prawns use antennal glands (also known as green glands) for excretion.
  • The green glands are responsible for eliminating nitrogenous waste in prawns.

Additional Information

  • Coxal glands - Scorpions: Coxal glands are excretory organs found in arachnids such as scorpions. These glands help in the removal of nitrogenous wastes.
  • Malpighian tubules - Insects: Malpighian tubules are a unique excretory system in insects. They are responsible for the removal of nitrogenous wastes and osmoregulation.
  • Flame cells - Flatworms: Flame cells are specialized cells found in flatworms, such as planarians, for excretion and osmoregulation. They form part of the protonephridial system.
  • Nephridia - Annelids: Nephridia are tubular excretory organs found in annelids like earthworms. They help in the removal of metabolic waste and maintenance of water balance.
Latest AP Police Constable Updates

Last updated on Jul 11, 2025

-> The AP Police Final Merit List 2025 has been released for the final examination which was held on 1st June 2025.

-> The physical test was conducted from 30th December 2024 to 1st February 2025.

-> AP Police Constable notification has been released for 6100 vacancies.

-> Candidates who are 12th Pass are eligible to appear for the examination. They can check the revised eligibility criteria to apply correctly. 

-> The selection of the candidates depends on Preliminary Exam, Physical Measurement Test (PMT), Physical Efficiency Test (PET), Final exam, and Final Selection.

-> The selected candidates for the post of Constable will get an AP Police Constable Salary range between Rs. 25,220 - 80,910.

-> Candidates can check the AP Police Constable Previous Year Papers for the effective preparation. You can also attempt the AP Police Constable Test Series to get an experience of the actual examination.

Get Free Access Now
Hot Links: teen patti royal teen patti all game teen patti master official happy teen patti teen patti joy official