Questions

Yielding the floor :  The speaker of the Lok sabha can ask a member of the house to stop speaking and let another member speak.

Crossing the floor:  Passing between the member addressing the House and the Chair which is considered breach of Parliamentary etiquette.

Point of Order:  A Member of Parliament may raise a point of order if he feels that the proceedings of' the House do not follow the normal rules. The presiding officer decides whether the point of order raised by the member should be allowed.

Calling Attention Motion:  With the prior permission of the Speaker, any member of the Parliament may call the attention of a Minister to a matter of urgent public importance. The Minister may make a brief statement about the matter or he may ask for time to make a statement later.

It is Blackboard or Chalkboard which is Black when clean, and as you write on it with white chalk it becomes dirty in White color.