Flowers pollinated by flies and beetles are distinct because they:
The flowers pollinated by flies and beetles secrete foul odours to attract these animals.
Question 232 of 501
📘 CLASS XII
Which floral reward does the tall flower of Amorphophallus provide to its pollinator?
In some species floral rewards are in providing safe places to lay eggs; an example is that of the tallest flower of Amorphophallus.
Question 233 of 501
📘 CLASS XII
The obligate relationship between the Yucca plant and a species of moth involves:
The moth deposits its eggs in the locule of the ovary and the flower, in turn, gets pollinated by the moth. They cannot complete their life cycles without each other.
Question 234 of 501
📘 CLASS XII
Which of the following is NOT an outbreeding device used by plants to prevent self-pollination?
Synchronization of pollen release and stigma receptivity favors autogamy. To prevent it (outbreeding device), species have non-synchronized release/receptivity.
Question 235 of 501
📘 CLASS XII
Monoecious plants like castor and maize prevent which type of pollination?
If both male and female flowers are present on the same plant (monoecious), it prevents autogamy but not geitonogamy.
Question 236 of 501
📘 CLASS XII
Dioecious plants like papaya prevent:
In dioecy (male and female flowers on different plants), both autogamy and geitonogamy are prevented.
Question 237 of 501
📘 CLASS XII
Pollen-pistil interaction is a dynamic process that involves:
Pollen-pistil interaction involves pollen recognition followed by promotion or inhibition, mediated by chemical components of the pollen interacting with those of the pistil.
Question 238 of 501
📘 CLASS XII
In plants where pollen is shed at the 2-celled stage, when does the generative cell divide to form male gametes?
In such plants, the generative cell divides and forms the two male gametes during the growth of pollen tube in the stigma.
Question 239 of 501
📘 CLASS XII
What is the purpose of "emasculation" in artificial hybridization techniques?
Removal of anthers from the flower bud before the anther dehisces... is referred to as emasculation. It prevents contamination with self-pollen.
Question 240 of 501
📘 CLASS XII
Triple fusion in the angiosperm embryo sac involves the fusion of:
The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN). This is triple fusion.
