Advantages of Vermicomposting:
1. Vermicompost is rich in essential plant nutrients.
2. It improves soil structure texture, aeration, and water holding capacity and prevents soil erosion.
3. Vermicompost is a rich in nutrients and an ecofriendly amendment to soil for farming and terrace gardening.
4. It enhances seed germination and ensures good plant growth.

(i) Worker bees are sterile females and smallest
(ii) They live in a chamber called "Worker Cell' and they perform different types of work in her life span.
(iii) During the first life span, she becomes a nurse bee attending indoor duties such as secretion of royal jelly, prepare bee bread to feed the larvae, take care of the queen and drones, secretes beeswax, builds combs, clean and fans the bee hives.
(iv) In the second life span she becomes soldier and guards the bee hive. She searches and gathers the pollen, nectar, propolis and water.

Nutritive values of fishes:
1. Fishes farm a rich source of protein food and provide a good staple food to tide over the nutritional needs of man.
2. Fish species such as sardines, mackerel, tuna, herrings have high amino acids concentrations particularly histidine which is responsible for the meaty flavor of the flesh.
3. It is rich in fat such as omega 3 fatty acids. Minerals such as calcium, magnesium, phosphorus, potassium, iron, manganese, iodine and copper.
4. Some of the by-products are fish oil, fish meal, Isinglass.

1. Lac is largely used as a sealing wax and adhesive for optical instruments. It is used in electric industry, as it is a good insulator.
2. It is used in preparations of shoe and leather polishes and as a protective coating of wood.
3. It is used in laminating paper board, photographs, engraved materials and plastic moulded articles.
4. Used as a filling material for gold ornaments.

Economic importance of prawn:
(i) Prawn is a very tasty proteinaceous food.
(ii) Economic growth can be achieved by prawn at a low cost.
(iii) It is profitable to cultivate prawns in fresh water at a low cost.
(iv) By Exporting prawns can also bring a lot of foreign currency to the country.