5th Class Computers Science Logo Basics Commands in Logo

     Commands in Logo

 

The simple Logo drawing commands move the turtle forward and backward and turn it right or left. (See Figure 5.2.4)  

 

 

 

Some commands and their abbreviations are given below:

• FD:   Forward
• BK:   Backward
• RT:   Right
• LT:   Left
• HT:   Hide Turtle
• ST:   Show Turtle
• CS:   Clear Screen
• CT:   Clear Text  

We will study about some LOGO commands in detail here. You need to press the Enter key after typing each command in the Text area.  

 

  Forward or FD

This moves the turtle forward by a number of steps. (See Figure 5.2.5)  

 

 

 

   

? Forward 50

OR

FD 50  

When the turtle moves, a line is drawn there.  

   Back or BK

This moves the turtle backward by a number of steps. (See Figure 5.2.6)  

 

 

 

 

? Back 20

OR ?

BK 20        

 

    Right or RT

This rotates the turtle right by a certain number of degrees (0 degrees to 360 degrees] (See Figure 5.2.7)  

 

 

 

 

? Right 90

OR

? RT 90  

 

Insert screen shot of result of above action  

 

     Left or LT

This rotates the turtle left. You can move the turtle from 0 degree to 360 degrees.    

 

 

? Left 90

OR

? LT 90  

 

    Hide Turtle or HT

This will hide the turtle. This means that you will not be able to see the turtle on the screen after issuing this command. If you give any command to draw, the turtle will still draw the line. It will continue to work even when it is not visible.  

 

 

? Hide Turtle

OR        

? HT  

 

   Show Turtle or ST

If you want the turtle to be visible again on the screen then give the Show Turtle command.    

 

 

? Show Turtle

OR

? ST  

 

 

   Clear Text or CT

This will clean the text area. Every command that has been written in the Text window will be erased.  

 

? Clear Text       

OR

? CT  

 

       Clear Screen or CS

This will clean the Graphic area, that is, everything drawn there will be erased.  

 

 

 

  

 

 Given below are the statements about LOGO. Select the correct statements.

1. LOGO screen is divided into three parts.

2. The upper part of the screen where the turtle moves and draws figures is called Graphic Area.

3. The lower part of the screen where we give different commands is the text area.

(A) 1 and 2                                                         

(B) 1 and 3

(C) 2 and 3                                                          

(D) Only 1

(E) Only 3  

 

Answer: (c)

Explanation

Correct Option:

(C) Statements 2 and 3 are correct about LOGO.

Incorrect Options:

(A) Statement 2 is correct whereas statement 1 is incorrect. Therefore, option (A) is incorrect.

(B) Statement 3 is correct whereas statement 1 is incorrect. Therefore, option (B) is incorrect.

(D) Statement 1 is incorrect. Therefore, option (D) is incorrect.

(E) Not only statement 3 is correct but statement 2 is also correct. Therefore, option (E) is incorrect.  

 

 

  Fill in the blanks:

1. The instructions you give to the turtle are called _____.

2. The question mark (?) on the lower part of the screen where we give commands is called _____.

3. A small triangle that appears in the center of the screen is called ____.

(A) Primitives, Prompt, Turtle                    

(B) Prompt, Primitives, Triangle

(C) Order, Prompt, Arrow                           

(D) Primitives, Primitives, Turtle

(E) Prompt, Commands, Triangle  

 

Answer: (a)

Explanation

Correct Option:

(A) Options given in (A) are correct.

Incorrect Options:

(B) Options given in (B) are incorrect.

(C) Options given in (C) are incorrect.

(D) Options given in (D) are incorrect.

(E) Options given in (E) are incorrect.