SHARMA CLASSES BHARATPUR

  Charge(Q) Electric charge is the basic physical property of matter that causes it to produce or experience a force when kept in an electric or magnetic field. An atom has a positively charged nucleus and negatively charged electrons revolving around it. increasing or decreasing of electron cause charge on a atom. Valence electrons(No of electron in outermost shell of electron) in metals are free to move within the conductor and cause flow of electric current. SI unit of charge is coulomb (C). There exists two types of charges in nature. (i) positive charge      (ii) negative charge The charge acquired by a glass rod when rubbed with silk is called a positive charge and the charge acquired by an ebonite rod when rubbed with wool is called negative charge.   Smallest stable charged particles are protons and electrons. Charge on an electron is negative and that on a proton is positive but both are equal in magnitu

  Control and Co-ordination Control and Co-ordination in Animals:   In animals, the nervous system and hormonal system are responsible for control and coordination. N E R V OUS CON T ROL CH E M I C A L CON T OL ·     I n f o r m a t i o n i s c a r r i e d i n t h e f o r m o f i m p u l s e s t h r o ugh t h e n e r v e s ·     I n f o r m a t i o n i s c a r r i e d t h r o ugh h o r m o n e s a n d c h e m i c a l s i n b l oo d. ·      C h a n g e s l a s t s f o r s h o r t p e r i o d. ·      C h a n g e s l a s t s f o r l o n g p e r i o d. ·      F a s t e r / qu i c k e r i n p r o ce ss . ·      S l o w e r p r o ce s s ·     B o dy r ec e i v e s s t im u l u s f r o m t h e e x t e r n a l e nv i r o n m e n t . ·     B o dy r ec e i v e s s t im u l u s f r o m t h e i n t e r n a l e nv i r o n m e n t .