In which of the following organisms is internal fertilization observed?

$A$: Restitutional nucleus can be observed in endothecium cells.
$R$: Endothecium cells are usually triploid.

Which of the following plants does not produce cleistogamous flowers?

Study the following statements and choose the correct option.
$I-$ Tapetum nourishes the developing pollen grains.
$II-$ Hilum represents the junction between ovule and funicle.
$III-$ In aquatic plants such as water hyacinth and water lily,pollination is by water.
$IV-$ The primary endosperm nucleus is triploid.

Who worked on embryological aspects and popularized the use of embryological characters in taxonomy?

In which of the following plants are the flowers shown in the image found?