Elater mechanism for seed dispersal is exhibited by

• Riccia

• Dryopteris

• Funaria

• Marchantia

Select the plants pollinated by water

(A) Water hyacinth

(B) Zostera

(C) Amorphophallus

(D) Vallisneria

(E) Yucca

• (A), (D) and (E) only

• (B) and (E) only

• (B) and (D) only

• (B), (C) and (D) only

• (B), (C) and (D) only

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.

• III and IV only

• II and III only

• I and II only

• II only

• II only

Megasporophyll of Cycas has the same nature as

• stamen

• petal

• sepal

• carpel

Xenia and metaxenia terms are related with

• pollen culture

• xylem and phloem

• endosperm

• embryo

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.

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

• (A) and (D) are correct

• (A) and (C) are correct

• (B) and (D) are correct

• (B) and (C) are correct

• (B) and (C) are correct

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.

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

• Flower

• Endosperm

• Gametes

• Fruit

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

• adnate

• dorsi fixed

• versatile

• syngenesious