Discussion
S1 - Self pollination can take place only in bisexual flowers.
S2 - Cross pollination can take place only in Unisexual flowers.
Answer: D
S1 is true and S2 is false, so the answer is S1 is true and S2 is false.
In school science, self-pollination is the transfer of pollen from the anther to the stigma of the same flower. That needs one flower to carry both stamens and carpels, that is, a bisexual flower, so S1 is true. A unisexual flower has only one of the two parts and cannot pollinate itself in this sense.
S2 says cross-pollination happens only in unisexual flowers. Cross-pollination is the transfer of pollen to the stigma of another flower, on the same plant or a different one. It occurs in bisexual flowers too (a bisexual flower can receive pollen from another plant's flower, and many bisexual flowers are built to avoid self-pollination), so 'only in unisexual flowers' is false.
The other options each mark S1 or S2 wrongly. A later, finer classification calls pollen moving between two flowers of one plant geitonogamy and treats it separately from self-pollination, but that does not make self-pollination possible in unisexual flowers, so the keyed reading holds.
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