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Consider the following four statements whether they are correct or wrong.
(A) The sporophyte in liverworts is more elaborate than that in mosses
(B) $Salvinia$ is heterosporous
(C) The life-cycle in all seed bearing plants is diplontic
(D) In $Pinus$ male and female cones are borne on different trees
The two wrong statements together are
(A) The sporophyte in liverworts is more elaborate than that in mosses
(B) $Salvinia$ is heterosporous
(C) The life-cycle in all seed bearing plants is diplontic
(D) In $Pinus$ male and female cones are borne on different trees
The two wrong statements together are
A
Statements (B) and (C)
B
Statements (A) and (B)
C
Statements (A) and (C)
D
Statements (A) and (D)
Detailed Solution
(A) is wrong: the sporophyte in mosses is more elaborate than that in liverworts; it has a foot, seta and a capsule with an elaborate mechanism of spore dispersal.
(B) is correct: $Salvinia$ (like $Selaginella$) produces two kinds of spores, microspores and megaspores, so it is heterosporous.
(C) is correct: in all seed-bearing plants (gymnosperms and angiosperms) the dominant phase is the diploid sporophyte and the gametophyte is highly reduced, so the life cycle is diplontic.
(D) is wrong: $Pinus$ is monoecious; the male and female cones are borne on the same tree (in $Cycas$ they are on different trees).
Hence the two wrong statements are (A) and (D).
(B) is correct: $Salvinia$ (like $Selaginella$) produces two kinds of spores, microspores and megaspores, so it is heterosporous.
(C) is correct: in all seed-bearing plants (gymnosperms and angiosperms) the dominant phase is the diploid sporophyte and the gametophyte is highly reduced, so the life cycle is diplontic.
(D) is wrong: $Pinus$ is monoecious; the male and female cones are borne on the same tree (in $Cycas$ they are on different trees).
Hence the two wrong statements are (A) and (D).