Procedure

1 . After the dissection experiment is over the dead animals are put in disposable paper bags and the bag is sealed. Animal tissues and excreta should also be put and sealed in disposable bags.

2. The packet containing the carcasses, tissues and excreta is taken to a place which has been marked for burying of such biological materials.

A deep pit is dug at the marked place; the packet is put in this pit. The pit is covered with litter and soil. If the pit is not dug deep and not covered properly, scavenging and wild animals like hyenas, wolves, dogs etc. Will redid the pit, may eat the carcass and leave everything in the open. If the wild animals eat the carcass treated with radioactive material they may fall sick and transmit the radioactivity to other fellow life forms. To ensure that the pit is not rebug by such animals the pit should be dug deep enough.

4. The size of the pit depends on the number and size of animals. For one animal like a frog or a rat a pit of approximately 2' x 2' x 2' size should be dug.

5. A similar pit is dug to bury the microbial culture materials for their disposal.

The following queries are related to this activity. Tick mark the option that stands correct after your observation.

1. What kind of bag was used for disposing off the animal(s) and animal materials(s)?

Jute bag/Paper bag polythene bag/Cloth bag.

2. How was the bag sealed?

By folding1By tying my using tape/By using staples

3. How deep was the pit? '

4. What material was used for covering the pit?

Soil/Pebbles/Litter/All the three.