Sexual Reproduction in Flowering Plants NEET Quiz

Pollen grains can be stored for several years in liquid nitrogen at –196°C (Cryopreservation)

Sporopollenin cannot be degraded by enzyme; strong acids and alkali, therefore it is helpful in preserving pollen as fossil.

When unisexual male and female flowers are present on different plants the condition is called dioecious and it prevents both autogamy and geitonogamy.

Wind pollination or anemophily is favoured by flowers having a single ovule in each ovary, and numerous flowers packed in an inflorescence. Wind pollination is a non-directional pollination.

Double fertilization is a characteristic feature exhibited by angiosperms. It involves syngamy and triple fusion.

Megaspore Mother Cell (MMC) undergoes meiosis to form megaspore.

Water hyacinth and water lily are aquatic plants pollinated by insect or wind.

Integumented and stalked megasporangium is called ovule.

Tapetum provides nourishment to developing pollen grain.

A typical stamen consist of anther and filament. The proximal end of filament is attached to thalamus or petal of the flower where as distal and bears anther.

Coconut milk represents free nuclear endosperm where the division of PEN is not followed by cytokinesis.

Pollen grains of different species are incompatible, so they fail to germinate.

Apomixis is a special mechanism to produce seeds without fertilisation.

In angiosperms, pollen grain is first male gametophyte. Pollen grain divides into generative cell and vegetative cell. Generative cell further divides into two sperms.

Filiform apparatus is finger like projections in each synergid.

Scutellum is the large persistent cotyledon in embryo of wheat grain.

Formation of fruit without fertilisation is called parthenocarpy. Banana is a parthenocarpic fruit therefore seedless.

In angiosperms, microsporogenesis and megasporogenesis involve meiosis.

Honey is made by using nectar of flowering plants.

The hilum is a scar on the seed coat through which the developing seeds were attached to the fruit.

Geitonogamy is genetically similar to autogamy since the pollen grains comes from the same plant.

Nectar and pollen grains are the usual floral rewards.

A solid style has transmission tissue with large intercellular spaces which allows growth of pollen tube.

Geitonogamy is transfer of pollen grains from the anther to the stigma of another flower of the same plant.

Pollen grains are rich in nutrients and it has become a fashion in recent years to use pollen tablets as food supplements.

Filiform apparatus, present in synergids, play an important role in guiding the pollen tube into the synergid.

Nucellus remnant is called – Perisperm (2n)

Double fertilization is a unique phenomenon that occur in angiosperms only.
Syngamy Triple fusion = Double fertilization