The development ofsporangium in Pteridium is

• a leptosporangiate type

• an eusporangiate type

• Both (a) and (b)

• None of the above

192.

What type of sorus is present in Nephrolepsis?

• Coenosorus

• Simple

• Mixed

• None of these

In a flowering plant, archesporium gives rise to

• wall and tapetum

• only tapetum and sporogenous cells

• only wall of the sporangium

• both wall and sporogenous cells

The aleurone layer in maize grain is specially rich in

• starch

• lipids

• protein

• cellulose

The growth of pollen tube towards embryo sac is

• geotropism

• chemotaxis

• thigmotaxis

• phototaxis

A hyaline bisexual and self-fertilized flower that does not open at all is

• chasmogamaus

• apogamous

• cleistogamous

• polygamous

Cleavage polyembryony occurs in

• Pinus

• Mini Cycas

• Cycas

• Ephedra

Ruminate endosperm occurs in

• Annonaceae/Areca nut

• Compositae

• Cruciferae

• Euphorbiaceae

The edible part of apple/ pear is

• cotyledons

• thalamus/ receptacle

• mesocarp

• endocarp

What is true about a gamo spermous apospory?

• Formation of embryo from egg of embryo sac proliferated from a nucellar cell

• Formation of embryo from egg of embryo sac formed directly from megaspore mother cell

• Formation of embryo directly from nucellus

• Formation of embryo directly from integument