Read the following statements and choose the correct statements.
I. Commelina species possess cleistogamous flowers.
II. Amorphophallus plants produce the tallest flowers.
III. Castor and maize are monoecious plants, in which both male and female flowers are borne on the same plant.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → I, II and III
True. I. Commelina species possess cleistogamous flowers. Commelina, Viola and Oxalis produce two kinds of flowers. Cleistogamous flowers never open, so the anthers shed pollen straight onto the stigma of the same flower.
True. II. Amorphophallus plants produce the tallest flowers. The flower of Amorphophallus is about 6 feet tall. It offers insects a safe place to lay eggs, and they pollinate it in return.
True. III. Castor and maize are monoecious plants, in which both male and female flowers are borne on the same plant. Unisexual flowers on the same plant stop autogamy but not geitonogamy. Papaya, with male and female flowers on different plants, is dioecious.
All three statements are correct.
NCERT Extract:
Pollination – “… Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers – chasmogamous flowers which are similar to flowers of other species with exposed anthers and stigma, and cleistogamous flowers which do not open at all (Figure 1.9c).”
Pollination – “… In some species floral rewards are in providing safe places to lay eggs; an example is that of the tallest flower of Amorphophallus (the flower itself is about 6 feet in height).”
Outbreeding Devices – “… Another device to prevent self-pollination is the production of unisexual flowers. If both male and female flowers are present on the same plant such as castor and maize (monoecious), it prevents autogamy but not geitonogamy.”