Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species ?

• P_fr forms

• P_r forms

• Both forms

• None of these

Removal of top fertile soil by wind or water is :

• Siltation

• Soil erosion

• Weathering of soil

• Leaching

Diadelphous stamens are the characteristic features of :

• Ranunculaceae

• Fabaceae

• Poaceae

• Malvaceae

The formation of embryo without fusion of gametes is termed as :

• apospory

• isogamy

• apogamy

• syngamy

Tetradynamous stamens are found in :

• Chrysanthemum

• Zinnia

• Poppy

• Brassica

Pollination occuring from one flower to another of same plant is :

• autogamy

• allogamy

• geitenogamy

• none of these

Seed which are able to withstand reduction in moisture and temperature are called

• dormant seeds

• recalcitrant seeds

• orthodox seeds

• non- viable seeds

Anthesis means

• growth of pollen tube inside the carpel

• dehiscence of anthers

• opening of floral bud

• emergence of anthers

Outgrowth developing along with hilum of the seed is:

• Plumule

• Radicle

• Strophiole

• Perisperm

Aleuron layer is found in :

• embryo

• nucellus

• endosperm

• endodermis