Seed of castor is

(1) non-endospermic, exalbuminous

(2) endospermic albuminous

(3) endospermic exalbuminous

(4) non-endospermic albuminous.

Ubisch bodies are secreted from

(1) ovule

(2) tapetum

(3) both of these

(4) none of these

Aleurone layer is

(1) haploid

(2) diploid

(3) triploid

(4) tetraploid

Edible part of apple is the

(1) thalamus

(2) mesocarp

(3) epicarp

(4) endocarp

Pollination by bat is called

(1) ornithophily

(2) chitopteriphily

(3) malacophily

(4) anemophily

During formation of which of the following free nuclear division occurs?

(1) Flower

(2) Endosperm

(3) Gametes

(4) Fruit

Xenia and metaxenia terms are related with

(1) pollen culture

(2) xylem and phloem

(3) endosperm

(4) embryo

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

(1) cutin

(2) suberin

(3) sporopollenin

(4) callose

The pollen tube usually enters the embryo sac

(1) through one of the synergids

(2) by directly penetrating the egg

(3) between one synergid and central cell

(4) by knocking off the antipodal cells

Double fertilization involves

(1) fertilization of the egg by two male gametes

(2) fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube

(3) fertilization of the egg and the central cell by two sperms brought by different pollen tubes

(4) fertilization of the egg and the central cell by two sperms brought by the same pollen tube.