From the statements given below, choose the option that is true for a typical female gametophyte of a flowering plant:

I:	It is 8-nucleate and 7-celled at maturity
II:	It is free-nuclear during the development
III:	It is situated inside the integument but outside the nucellus
IV:	It has an egg apparatus situated at the chalazal end

 

1.	I and IV	2.	II and III
3.	I and II	4.	II and IV

Autogamy can occur in a chasmogamous flower if:
1. Pollen matures before the maturity of ovule.
2. Ovules mature before the maturity of pollen.
3. Both pollen and ovules mature simultaneously.
4. Both anther and stigma are of equal lengths.

Choose the correct statement from the following:

A particular species of the plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These
modifications facilitate pollination by:

From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

In a fertilised embryo sac, the haploid, diploid, and triploid structures are:

In an embryo sac, the cells that degenerate after fertilisation are:
1. Synergids and primary endosperm cell
2. Synergids and antipodals
3. Antipodals and primary endosperm cell
4. Egg and antipodals

While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant?
1. Bagging of the female flower
2. Dusting of pollen on the stigma
3. Emasculation
4. Collection of pollen

In the embryos of a typical dicot and a grass, true homologous structures are:

The phenomenon observed in some plants wherein parts of the sexual apparatus are used for forming embryos without fertilisation is called