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501 questions in this collection · Page 33 of 51
Question 321 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
How are Water Hyacinth and Water Lily pollinated?
In a majority of aquatic plants such as water hyacinth and water lily, the flowers emerge above the level of water and are pollinated by insects or wind as in most of the land plants.
Question 322 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The tallest flower, Amorphophallus, provides which specific reward 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 323 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Continued self-pollination in hermaphrodite flowers often leads to:
Continued self-pollination result in inbreeding depression.
Question 324 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Self-incompatibility is a mechanism that prevents self-pollination. It is:
The third device to prevent inbreeding is self-incompatibility. This is a genetic mechanism.
Question 325 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following conditions prevents both autogamy and geitonogamy?
In several species such as papaya, male and female flowers are present on different plants... (dioecy). This condition prevents both autogamy and geitonogamy.
This dialogue is mediated by chemical components of the pollen interacting with those of the pistil.
Question 327 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Emasculation is the removal of anthers from a flower bud. It is performed to:
If the female parent bears bisexual flowers, removal of anthers... is referred to as emasculation... to prevent contamination of its stigma with unwanted pollen (essentially self-pollen in this context).
Question 328 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Double fertilisation consists of which two events?
Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilisation.
Question 329 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following seeds is albuminous (retains endosperm)?
Albuminous seeds retain a part of endosperm... e.g., wheat, maize, barley, castor.
Question 330 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Seeds that have no residual endosperm as it is consumed during embryo development are called:
Non-albuminous seeds have no residual endosperm as it is completely consumed during embryo development (e.g., pea, groundnut).