NEET 2019 Odisha · BiologyPrevious Year Question
In which one of the following, both autogamy and geitonogamy are prevented?
Answer: (B) (B) Papaya. Answer: B.
- A.(A) Wheat
- B.(B) Papaya✓
- C.(C) Castor
- D.(D) Maize
Correct Answer
(B) (B) Papaya
Solution & Explanation
Answer: B. In papaya male and female flowers are borne on different plants (dioecy); each plant is either male or female, so pollen cannot reach a stigma on the same plant — this prevents both autogamy and geitonogamy. By contrast castor and maize are monoecious (unisexual flowers on the same plant), which prevents autogamy but not geitonogamy; wheat has bisexual flowers. NCERT: Ch 1, p.15, lines 37-40 — "In several species such as papaya, male and female flowers are present on different plants, that is each plant is either male or female (dioecy). This condition prevents both autogamy and geitonogamy."
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