Questions

An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns of a table.

A journal is also called as a book of prime entry.Transactions occurred are first entered in this book to show which accounts should be debited and which should be credited.

on the basis of entries made in the journal, accounts are prepared, the book which contains the accounts is called a ledger. Transactions entered in the journal are classified according to their nature and posted in their respective accounts in ledger. it is also called as book of final entry.

Encapsulation, Object class and instance.

An organism is a living thing, and there are two broad categories of organisms: those made up of only a single cell, and those made up of multiple cells.

Single-celled organisms means which contains only one cell are called unicellular organisms. 'Uni-' means 'one,' so the name 'unicellular' literally means 'one cell.'

Examples of Unicellular or Single celled organisms ::

Prokaryotic organisms like Bacteria,...

Some algae like green algae, euglena,...

Deep sea animals cannot produce food as there is no light. They have to depend upon the fall out of organic debirs raining down on them from surface layers. Hence they are detritivores.

The four main functions of a computer are ::

1. Input,

2. Processing,

3. Output and

4. Storage