A labour union which limits its membership to workers with a particular skill?

Carbohydrates synthesis is carried out by ________?

Which element is deficient in milk ________?

Extension of storage life by inhibition of sprouting of potatoes, onions and garlic can be achieved by radiation dose of________?

The period between births of two successive calves from one cow is called________?

The use of the resources of an individual or firm, a region, or a nation to produce one or a few goods and services?