India has the distinction of producing all the four types of silk i.e., a) Mulberry silk (91.7%) b) Tasar silk (1.4%) c) Eri silk (6.4%) and d) Muga silk (0.5%) which are produced by different species of silkworms. Name the species that produces a large amount and least amount of silk in India.

a. Growing fish or other aquatic animals and plants together in an integrated system. The fish wastes provides nutrients for the plants and the plants filter the water. Additionally, bacteria break down by-products such as ammonia.

b. Growing plants in a nutrient solution instead of soil. Fish kept in the water provide the required nutrients.

Write the appropriate scientific terms for above (a) and (b) and differentiate between them.

Why are fish so efficient at converting feed to flesh?

Which one of the following is not related to vermiculture?

a. It maintains soil fertility.

b. It helps in the breakdown of inorganic matter.

c. It gives porosity, aeration and moisture-holding capacity of the soil.

d. It helps in the degradation of non-biodegradable solid waste.

Select the correct one from the following options.