Questions

Nostoc is a prokaryote. Prokaryotic cells lack membrane bound organelles and well organized nucleus, that is nuclear envelope is absent in these cells.

The nuclear envelope, also known as the nuclear membrane, a bilayer membranes which surrounds the nucleus, and in eukaryotic cells it encases the genetic material.

Papayas are yellow due to the presence of carotene and xanthophyll pigments i.e, Caricaxanthin present in the chromoplasts of the fruit pulp.

The coloration of the different tissues in plants is due to the plastids which are present in the cells. Leucoplasts are white in colour, chloroplasts are green in colour and chromoplasts are of various colours. These plastids can take any colour at different time. Therefore, green fruits ( chloroplasts) turn colurful (chromoplasts) at maturity.

North sea is the largest fishing ground while the North-West pacific is the greatest region

In economics, we come across Demand management in macro-levels and at micro-levels within individual organizations.

Demand management is a planning methodology used to forecast, plan for and manage the demand for products and services.  

Activity based, Business activity patterns and user profiles are the types of activity within demand management.

‘Lest’ is always followed by ‘Should’, as it is used to express a purpose. Thus, the correct formation would be, ‘He decided to take the help of a guide lest he should miss the way’.