Question Discussion & Solution

The correct answer is option 2.

Concept:

A process control block (PCB) is a data structure used by computer operating systems to store all process-related information. A process descriptor is another name for it. The operating system creates a process control block when a process is created (initialized or installed).

Process Control is a set of system calls that perform tasks such as process creation, termination, and so on.

Process Control Functions:

• End and Abort
• Load and Execute
• Abort, end
• Create Process and Terminate Process
• Wait and Signal Event
• Allocate and free memory.

Hence the correct answer is process control.

Additional Information File Management:

File manipulation tasks such as creating, reading, and writing is handled by file management system calls.

File manipulation Functions:

• Create a file
• Delete file
• Open and close file
• Read, write, and reposition
• Get and set file attributes

Device Management:

Device management is responsible for device manipulation such as reading from and writing to devise buffers.

Device management Functions:

• Request and release device
• Logically attach/ detach devices
• Get and Set device attributes

Information Maintenance:

It handles information and its transfer between the OS and the user program.

Information Maintenance Functions:

• Get or set time and date
• Get process and device attributes

Concept:

In general, each object contains three object associated attributes:

• Object prototype: It is kind of reference/indication to another object from which properties are inherited.
• Object class: It is a kind of string which classifies the type an object.
• Object's extensible flag: It simply specifies that whether some new properties are added to the object

Concept:

• Nutrition is a process by which an organism consumes and uses food materials.
• According to WHO, Nutrition is the intake of food, considered in relation to the body's dietary needs.
• There are various modes of nutrition mainly Autotrophic, Heterotrophic, Chemoautotrophic, Saprophytic,  etc.

Explanation:

• Holophytic or autotrophic nutrition: In this type of nutrition the organisms prepare their food by themselves. Eg - green plants.
• Plants prepare their food by the process called photosynthesis. 
• During photosynthesis, plants trap solar energy or light energy with the help of chloroplast present in the green leaves and convert it into Chemical energy
• A pigment called chlorophyll is present in the chloroplasts which are required in trapping sunlight
• Plants utilize Carbon dioxide and Water for the synthesis of carbohydrates during photosynthesis, oxygen is liberated as a side product
• This gaseous exchange occurs through the stomata present on the leaf surface

• These events can be demonstrated by the following equation:

  \(\rm \underset{(Carbon\ dioxide)}{6CO_2} + \underset{(Water)}{6H_2 O} \xrightarrow[Chlorophyll]{Sunlight} \underset{(Carbohydrates)}{C_6H_{12}O_6} + \underset{(Oxygen)}{6O_2}\)

Therefore, Plants require CO₂, Chlorophyll, Sunlight and water for autotrophic nutrition and hence the correct option will be ''All of these''.

The correct answer is option 2 i.e. Character, Field, Record, File, Database.

Additional Information

• A character is any letter, number, space, punctuation mark, or symbol that can be typed on a computer.
• The word "computer," for example, consists of eight characters.
• The term "fields" refers to columns or vertical categories of data.
• A record is composed of fields and contains all the data about one particular person,
• A file is the common storage unit in a computer, and all programs and data are "written" into a file and "read" from a file.
• A database is an organized collection of structured information, or data, typically stored electronically in a computer system.
• A database is usually controlled by a database management system (DBMS).

Rupee, Pound and Yen are types of currency.