Which layer of the anther wall helps in its dehiscence?

   

1.	A	2.	B
3.	C	4.	D

Consider the following statements:

Flowers, which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

(1) water

(2) bee

(3) wind

(4) bat

Functional megaspore in an angiosperm develops into

(1) ovule

(2) endosperm

(3) embryo sac

(4) embryo

Wind pollination is common in

(1) lilies

(2) grasses

(3) orchids

(4) legumes

Unisexuality of flowers prevents

(1) autogamy, but not geitonogamy

(2) Both geitonogamy and xenogamy

(3) geitonogamy, but not xenogammy

(4) autogamy and geitonogamy

What does the filiform apparatus do at the entrance into ovule?

(1) It helps in the entry of pollen tube into a synergid

(2) It prevents entry of more than one pollen tube into the embryo sac

(3) It brings about opening of the pollen tube

(4) It guides pollen tube from a synergid to egg

Male gametes in angiosperms are formed by the division of:

(1) microspore

(2) generative cell

(3) vegetative cell

(4) microspore mother cell

Long filamentous threads protruding at the end of a young cob of maize are :

(1) anthers

(2) styles

(3) ovaries

(4) hairs

Male gametophyte in angiosperms produces

(1) two sperms and a vegetative cell

(2) single sperm and a vegetative cell

(3) single sperm and two vegetative cells

(4) three sperms