SEXUAL REPRODUCTION IN PLANT 03-05-23

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect?

• (a) Ovary develops into fruit

• (b) Zygote develops into embryo

• (c) Central cell develops into endosperm

• (d) Ovules develop into embryo sac

Persistent nucellus in the seed is known as

• (a) Chalaza

• (b) Perisperm

• (c) Hilum

• (d) Tegmen

The events in pollen-pistil interaction are given below

(i) Pollen grain germinates to form pollen tube.

(ii) Pollen tube enters the ovule through micropyle.

(iii) Pollen grain reaches the stigma.

(iv) Pollen tube grows through the tissues of stigma and style and reaches the ovary.

The sequential order of their occurence is

• (a) (iii) --(i)--(iv)-- (ii)

• (b) (ii)-- (iv)-- (iii)-- (i)

• (c) (iii)-- (iv)-- (ii)-- (i)

• (d) (ii)-- (iii)-- (i)-- (iv)

What type of pollination takes place in Vallisneria?

• (a) Male flowers are carried by water currents to female flowers at surface of water.

• (b) Pollination occurs in submerged condition by water.

• (c) Flowers emerge above surface of water and pollination occurs by insects.

• (d) Flowers emerge above water surface and pollen is carried by wind.

In which one of the following, both autogamy and geitonogamy are prevented?

• (a) Maize

• (b) Wheat

• (c) Papaya

• (d) Castor

Which is the most common type of embryo sac in angiosperms?

• (a) Bisporic with two sequential mitotic divisions

• (b) Tetrasporic with one mitotic stage of divisions

• (c) Monosporic with three sequential mitotic divisions

• (d) Monosporic with two sequential mitotic divisions

Find out the haploid cells among the following :–

(i) Egg cell (ii) Male gamete (iii) Root cell (iv) Leaf cell

(v) Synergid cell (vi) Antipodal cell.

• (a) iv, v, vi

• (b) i, ii, iii

• (c) i, iii, v, vi

• (d) i, ii, v, vi

Pollination is essential in angiosperm plants because:-

• (a) It decreases the time required for fertilization

• (b) Both of the male and female gametes are non-motile and they need to be brought together for fertilization

• (c) The egg cell in embryosac is located at the micropylar end

• (d) Embryosac contains 7 haploid cells

In angiosperms how many megaspore mother cells are required to produce 600 functional megaspores?

• (a) 600

• (b) 150

• (c) 2400

• (d) 200

Which of the following has proved helpful in preserving pollen as fossils?

• (a) Oil content

• (b) Cellulosic intine

• (c) Pollenkitt

• (d) Sporopollenin