CBSE Class 12 Biology Sexual Reproduction in Flowering Plants MCQs

Question :  Cleistogamous flowers are

a) Cleistogamous flowers are

b) Cross pollinated

c) Insect pollinated

d) Insect pollinated

Answer :  A

Question :  Embryo sac is also known as

a) Megagametophyte

b) Microgametophyte

c) Microsporangium

d) Megasporangium

Answer :  A

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

a) Synergid, zygote and primary endosperm nucleus

b) Synergid, antipodal and polar nuclei

c) Antipodal, synergid and primary endosperm nucleus

d) Synergid, polar nuclei and zygote.

Answer :  A

Question :  Route used by pollen tube for entering ovule is

a) Any of the above

b) Chalaza

c) Micropyle

d) Integument

Answer :  A

Question :  Embryo sac is called monosporic when it develops from

a) One of the megaspores out of the four megaspores which are derived from division of megaspore mother cell

b) Three megaspores

c) Only from two functional megaspores

d) None of these

Answer :  A

Question :  Number of prothallial cells present in male gametophyte of flowering plant is

a) Zero

b) One

c) Two

d) Four

Answer :  A

Question :  Embryo sac is found in

a) Ovule

b) Seed

c) Embryo

d) Endosperm

Answer :  A

Question :  Gloriosa superba exhibits

a) Herkogamy

b) Cleistogamy

c) Self sterility

d) Heterostyly

Answer :  A

Question :  In an embryo sac, the cells that degenerate after fertilisation are

a) Synergids and antipodals

b) Antipodals and primary endosperm cell

c) Egg and antipodals.

d) Synergids and primary endosperm cell

Answer :  A

Question :  Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

a) Wind

b) Bat

c) Bee

d) Water

Answer :  A

Question :  While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant

a) Emasculation

b) Collection of pollen

c) Dusting of pollen on stigma

d) Bagging of female flower

Answer :  A

Question :  Functional megaspore in an angiosperm develops into

a) Embryo sac

b) Embryo

c) Endosperm

d) Ovule

Answer :  A

Question :  A dioecious flowering plant prevents both

a) Autogamy and geitonogamy

b) Autogamy and xenogamy

c) Geitonogamy and xenogamy

d) Cleistogamy and xenogamy

Answer :  A

Question :   Pine apple fruit develops from 

Question :  Among the terms listed below, those that of are not technically correct names for a floral whorl are:

i. Androecium

ii. Carpel

iii. Corolla

iv. Sepal

a) ii and iv

b) i and ii

c) iii and iv

d) i and iv

Answer :  A

Question :  How many microspore mother cells are required to produce 1000 microspores/pollen grains?

a) 250

b) 200

c) 150

d) 100

Answer :  A

Question :  Embryo sac is to ovule as _______ is to an anther

a) Pollen grain

b) Androecium

c) Filament

d) Stamen

Answer :  A

Question :  Which of the following represents the female gametophyte in angiosperms?

a) Embryo sac

b) Synergid

c) Endosperm

d) Embryo

Answer :  A

Question :  In a typical complete, bisexual and hypogynous flower the arrangement of floral whorls on the thalamus from the outermost to the innermost is:
a) Calyx, corolla, androecium and gynoecium
b) Calyx, corolla, gynoecium and androecium
c) Gynoecium, androecium, corolla and calyx
d) Androecium, gynoecium, corolla and calyx
Answer :  A

Question :  In a breeding experiment, the selected male parent is diploid and the female parent is tetraploid. What will be the ploidy level of the endosperm that will develop after double fertilisation?

a) Pentaploid

b) Tetraploid

c) Triploid

d) Diploid

Answer :  A

Question :  A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is:

a) Plant is dioecious and bears only staminate flowers

b) Plant is monoecious

c) Plant is dioecious and bears both pistillate and staminate flowers

d) Plant is dioecious and bears only pistillate flowers

Answer :  A

Question :  The development of fruits without fertilisation of the ovary, is called

a) parthenocarpy

b) parthenogenesis

c) agamospermy

d) None of these

Answer :  A

Question :  The outermost and innermost wall layers of microsporangium in an anther are respectively

a) Epidermis and tapetum

b) Epidermis and middle layer

c) Epidermis and endodermis

d) Endothecium and tapetum

Answer :  A

Question :  When the pollen of a flower is transferred to the stigma of another flower on the same plant, the process is known as

a) geitonogamy

b) autogamy

c) Both

d) None of these

Answer :  A

Question :  The number of meiotic divisions, required to produce 400 seeds in a pea plant, is

a) 500

b) 400

c) 300

d) 200

Answer :  A

Question :  From among the sets of terms given below, identify those that are associated with the gynoecium

a) Stigma, ovule, embryo sac, placenta

b) Thalamus, pistil, style, ovule

c) Ovule, ovary, embryo sac, tapetum

d) Ovule, stamen, ovary, embryo sac

Answer :  A

Question :  During microsporogenesis, meiosis occurs in

a) Microspore mother cells

b) Microspore tetrads

c) Pollen grains

d) Endothecium

Answer :  A

Question :  A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is

a) plant is dioecious and bears only staminate flowers

b) plant is monoecious

c) plant is dioecious and bears both pistillate and staminate flowers

d) None of these

Answer :  A

Question :  Starting from the innermost part, the correct sequence of parts in an ovule are

a) egg, embryo sac, nucellus, integument

b) embryo sac, nucellus, integument, egg

c) egg, integument, embryo sac, nucellus

d) egg, nucellus, embryo sac, integument

Answer :  A

Question :  Autogamy can occur in a chasmogamous flower if

a) both pollen and ovules mature simultaneously

b) both anther and stigma are of equal lengths

c) ovules mature before maturity of pollen

d) None of these

Answer :  A

Question :  From the statements given below choose the option that are 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

a) i & ii

b) ii & iv

c) i and iv

d) None of these

Answer : A

Question :  Apomixis is a type of reproduction that results is the development of a/an

a) New organism without fusion of gametes

b) New organism from fusion products of gametes

c) Embryo from endosperm

d) None of these

Answer :  A

Question :  Choose the correct statement from the following.

a) Cleistogamous flowers always exhibit autogamy

b) Cleistogamous flowers always exhibit autogamy

c) Cleistogamous flowers exhibit both autogamy and geitonogamy

d) All of these

Answer :  A

Question :  Wind pollination is common in

a) Grasses

b) Lilies

c) All of these

d) Legumes

Answer :  A

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

a) Dioecious plant bearing only male or female flowers.

b) Monoecious plant with bisexual flowers

c) Dioecious plant with bisexual flowers

d) None of these

Answer :  A

Question :  Autogamy can occur in a chasmogamous flower if:

a) Both pollen and ovules mature simultaneously

b) Both anther and stigma are of equal lengths

c) Ovules mature before maturity of pollen

d) Pollen matures before maturity of ovule

Answer :  A

Question :  Choose the correct statement from the following

a) Cleistogamous flowers always exhibit autogamy

b) Chasmogamous flowers always exhibit geitonogamy

c) Cleistogamous flowers exhibit both autogamy and geitonogamy

d) Chasmogamous flowers never exhibit autogamy

Answer :  A

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

a) Synergid, zygote and primary endosperm nucleus

b) Synergid, antipodal and polar nuclei

c) Both

d) None of these

Answer :  A

Question :  In an embryo sac, the cells that degenerate after fertilisation are

a) Synergids and antipodals

b) Synergids and antipodals

c) Antipodals and primary endosperm cell

d) None of these

Answer :  A

Question :  Which of the following floral parts forms the pericarp after fertilisation?

a) Ovary wall

b) Inner integument

c) Outer integument

d) All of these

Answer :  A

Question :  Double fertilization was first discovered by Nawaschin (1898) in

a) Lilium and Fritillaria

b) Mango and Sugarcane

c) Papaya and Pea

d) Papaya and Pea

Answer :  A

Question :  Egg apparatus consists of

a) Egg and synergids

b) Egg and synergids

c) Egg and polar nuclei

d) All of these

Answer :  A

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

a) Wind

b) Animals.

c) Water

d) Insects

Answer :  A

Question :  What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?

a) 63

b) 84

c) 81

d) 75

Answer :  A

Question :  In ginger vegetative propagation occurs through

a) Rhizome

b) Offsets

c) Bulbils

d) None of these

Answer :  A