Question

The given diagram shows three plants of the same species. Identify the types of pollination indicated as $P_1,P_2$ and $P_3$ respectively.

• A. $P_1=$ Allogamy, $P_2=$ Chasmogamy, $P_3=$ Cleistogamy
• B. $P_1=$ Autogamy, $P_2=$ Xenogamy, $P_3=$ Geitonogamy
• C. $P_1=$ Autogamy, $P_2=$ Geitonogamy, $P_3=$ Xenogamy
• D. $P_1=$ Gietonogamy, $P_2=$ Allogamy, $P_3=$ Autogamy

Answer 1

The correct option is C $P_1=$ Autogamy, $P_2=$ Geitonogamy, $P_3=$ Xenogamy

• Autogamy (Gk. autos-self, gamos-marriage) is a type of self-pollination in which an intersexual or perfect flower is pollinated by its own pollen. Thus, $P_1$ represents autogamy.
• Geitonogamy is a type of pollination in which pollen grains of one flower are transferred to the stigma of another flower belonging to either the same plant or a genetically similar plant. In geitonogamy, the flowers often show modifications similar to ones found in xenogamy or cross-pollination. Thus, $P_2$ represents geitonogamy.
  
• Xenogamy or cross-pollination is the transfer of pollen grains from the anther of one flower to the stigma of a genetically different flower (from a different plant). Thus, $P_3$ represents xenogamy.

So, the correct answer is option C.