(a) For the purpose of constructing and maintaining and caring for any such zoological park and the buildings and grounds thereof and of securing and displaying zoological collections thereon the corporate authorities of any forest preserve district containing a population of 150,000 or more but less than 3,000,000 are authorized to levy annually a tax of not to exceed .0058% of value as equalized or assessed by the Department of Revenue, upon all the taxable property in the district.
     (b) In a forest preserve district located in a county with a population in excess of 140,000 but less than 200,000 and contiguous to the Mississippi River, however, the annual tax may be at a rate not to exceed 0.06%.
     (c) This tax shall be levied and collected in the same manner as the general taxes of the forest preserve district and shall be in addition to the maximum of all other taxes and tax rates which the district is now or may hereafter be authorized to levy upon the aggregate valuation of all taxable property within the district and shall be exclusive of and in addition to the maximum amount and rate of taxes the district is now or may hereafter be authorized to levy for general purposes under Section 13 of the Downstate Forest Preserve District Act or under any other law which may limit the amount of tax which the district may levy for general purposes. The proceeds of the tax herein authorized shall be kept as a separate fund.
     (d) A tax in excess of 0.01% may not be levied under subsection (b) until the question of levying the tax has been submitted to the electors of the forest preserve district at a regular election and approved by a majority of the electors voting on the question. The District must certify the question to the proper election authority, which must submit the question at an election in accordance with the Election Code.
     The election authority must submit the question in substantially the following form:
         Shall the corporate authority of the forest preserve