Question

Select the correct option representing the excretory organs present in (i) earthworm , (ii) centipede , (iii) prawn , and (iv) flatworm.

• A. (i) Malpighian tubules (ii) Flame cell (iii) Nelphridia (iv) Green gland
• B. (i) Flame cell (ii)Green gland (iii) Malpighian tubules (iv) Nephridia
• C. (i) Nephridia (ii)Malpighian tubules (iii) Green gland (iv) Flame cell
• D. (i)Green gland (ii) Nephridia (iii) Flame cell (iv) Malpighian tubules

Answer 1

The correct option is C (i) Nephridia (ii)Malpighian tubules (iii) Green gland (iv) Flame cell

1. In earthworm, carbon dioxide and nitrogenous wastes are the main waste materials. The carbon dioxide is excreted out from the body through its moist skin by the process of diffusion. The nitrogenous wastes are excreted out of the body by special excretory organs called nephridia.
   
2. In centipede, the excretory system consists of a pair of Malpighian tubules that run from the midgut to the hindgut. Waste exits the body through the anus at the posterior end.
   
3. Excretory organs of Prawn are known as green glands or antennal glands. They are called green glands for their color and antennal gland for the location at the base of the second antennae.
   
4. Invertebrates such as flatworms use a nephridium as their excretory organ. At the end of each blind tubule of the nephridium is a ciliated flame cell. As the fluid passes down the tubule, solutes are reabsorbed and returned to the body fluids.
   

So, the correct option is '(i) Nephridia (ii)Malpighian tubules (iii) Green gland (iv) Flame cell'.