Whether biotech companies covered under the payment of gratuity act ??

Sir , Recently a BIOTECH Company ( MAHYCO Pvt Ltd, Jalna (maharashtra) Retrenched its Employees in the wake of BT ( biotech approvals ).. But employees were paid Just EX-GRATIA Payment and 2 Months Salary . ARE they Eligible For GRATUITY is completed 5 years of service , AS cOMPANY Employes more than 300 PEOPLE. The Employees Retrenched were of Grade- Associate Reasearch Scientists .. Kindly reply ...