The animals have different excretory structures. Match the excretory structures with the animals and then choose the correct option :

Animals		Excretory Structures
1.	Planaria	a.	Malpighian tubule
2.	Earthworm	b.	Green glands
3.	Cockroach	c.	Nephridia
4.	Prawn	d.	Flame cells

CONCEPT:

Excretory Structures in Different Animals

• Animals have specialized excretory organs that help in removing metabolic wastes and maintaining osmotic balance.
• Different groups of animals possess distinct excretory structures adapted to their physiology and habitat.
• Common excretory structures include:
  • Flame cells (or protonephridia) found in simple invertebrates like Planaria.
  • Nephridia, segmented tubular excretory organs found in segmented worms like Earthworms.
  • Malpighian tubules, excretory structures in insects such as Cockroaches.
  • Green glands (also called antennal glands or maxillary glands), excretory organs in crustaceans like Prawns.

EXPLANATION:

• Matching animals with their correct excretory structures:
  • Planaria — Flame cells (d)
  • Earthworm — Nephridia (c)
  • Cockroach — Malpighian tubules (a)
  • Prawn — Green glands (b)
• Therefore, the correct matching is: 1 - d, 2 - c, 3 - a, 4 - b.

Hence, the correct answer is Option 1.