Xenia and metaxenia terms are related with

pollen culture

xylem and phloem

endosperm

embryo

C.

endosperm

The direct or indirect effect of male parent (pollen grain) on structures inside embryo sac except embryo is knoqn as xenia.

Metaxenia may be defined as the effect of pollen on the seed coat or pericarp lying outside the embryo sac.

Assertion : The megaspore mother cell undergoes mitosis to produce four megaspores.

Reason : Megaspore mother cells and the megaspores are both haploid.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both the assertion and reason are false.

When the filament runs throughout the length of anther, it is called

Which of the following feature(s) is/are common to both wind and water pollinated flowers?

I. Pollen grains are long and ribbon-like.

II. Stigma is large and feathery.

III. The flowers are not colourful.

IV. The flowers do not produce nectar.

Elater mechanism for seed dispersal is exhibited by

Megasporophyll of Cycas has the same nature as

Assertion : The two cotyledons in the seed are often referred to as the embryonic leaves.

Reason : The embryo contains radicle and plumule.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both the assertion and reason are false.

Select the plants pollinated by water

(A) Water hyacinth

(B) Zostera

(C) Amorphophallus

(D) Vallisneria

(E) Yucca

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

Consider the following statements and choose the correct option

(A) The ovule is attached to the placenta by means of a stalk called filament

(B) The ovule fuses with the stalk in the region called hilum

(C) The two protective envelopes of ovule are called integuments

(D) The small opening in the tip of ovule is called germ pore

Of the above statements

Sexual Reproduction in flowering Plants