(1) If any authority or body fails to make within a reasonable time any nomination which it is entitled to make under section 4, the Central Government may itself nominate a member to fill the vacancy.
     (2) Where a member of the Board dies, resigns or is removed, or ceases to reside in India, or becomes
     incapable of acting, the Central Government shall, on the recommendation of the authority or body entitled to nominate the member under section 4, or where such recommendation is not made within a reasonable time, then on its own initiative, appoint a person to fill the vacancy.
     (3) No act done by the Board shall be questioned on the ground merely of the existence of any vacancy in, or defect in the constitution of the Board.