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(A) Let us analyze each statement:$(a)$ $Equisetum$ is a pteridophyte. In pteridophytes,the female gametophyte is retained on the parent sporophyte fo

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Two

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(A) Let us analyze each statement:$(a)$ $Equisetum$ is a pteridophyte. In pteridophytes,the female gametophyte is retained on the parent sporophyte for variable periods. This statement is correct.$(b)$ $Ginkgo$ is a gymnosperm. In gymnosperms,the male gametophyte is highly reduced and is not independent; it is confined within the pollen grain. This statement is correct.$(c)$ $Riccia$ is a liverwort,while $Polytrichum$ is a moss. The sporophyte of $Riccia$ is the simplest (consisting only of a capsule),whereas the sporophyte of $Polytrichum$ is more complex (differentiated into foot,seta,and capsule). Thus,the sporophyte in $Riccia$ is less developed than in $Polytrichum$. This statement is incorrect.$(d)$ Sexual reproduction in $Volvox$ is oogamous,not isogamous. This statement is incorrect.$(e)$ The spores of slime molds possess true cell walls (made of cellulose),which makes them extremely resistant to adverse conditions. This statement is incorrect.Therefore,only statements $(a)$ and $(b)$ are correct. The total number of correct statements is $2$.

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