The egg cell is a haploid female gamete forming a zygote after .

Identify the characters with reference to the plant in which eight nucleated embryo sacs were first studied by Strasburger.

I. Micropyle, chalaza, and funiculus are arranged in the same vertical line in the ovule.
II. Presence of both unisexual and bisexual flowers in the same plant.
III. Filiform apparatus helps in the conduction of food materials from endosperm to egg apparatus.
IV. Long funiculus coils like a watch spring around the ovule.

Identify the correct pair:

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Read the following and identify the characters found in both Cycas and Pteris.

(I) Formation of motile male gametes.

(II) Formation of the haploid endosperm.

(III) Formation of sporophyte directly from gametophyte without a gametic union.

(IV) Formation of archegonium female gametophyte. 

The correct pair is