CBSE Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Set 03

Question. In which one of the following, both autogamy and geitonogamy are prevented?
(a) Wheat
(b) Papaya
(c) Castor
(d) Maize

Answer : B

Question. Ploidy of ovum of angiosperms is
(a) haploid
(b) diploid
(c) triploid
(d) polyploid

Answer : A

Question. Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in
(a) papaya
(b) bottle gourd
(c) maize
(d) all of these.

Answer : A

Question. Which of the following statement is correct?
(a) Sporopollenin can withstand high temperatures but not strong acids.
(b) Sporopollenin can be degraded by enzymes.
(c) Sporopollenin is made up of inorganic materials.
(d) Sporopollenin can withstand high temperature as well as strong acids and alkalis.

Answer : D

Question. Function of filiform apparatus is to
(a) recognise the suitable pollen at stigma
(b) stimulate division of generative cell
(c) produce nectar
(d) guide the entry of pollen tube.

Answer : D

Question. Formation of gametophyte directly from sporophyte without meiosis is
(a) apospory
(b) apogamy
(c) parthenogenesis
(d) amphimixis.

Answer : A

Question. Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called
(a) xenogamy
(b) geitonogamy
(c) karyogamy
(d) autogamy.

Answer : B

Question. Emasculation is not required when flowers are
(a) bisexual
(b) intersexual
(c) unisexual
(d) either (a) or (b)

Answer : C

Question. The arrangement of the nuclei in a normal embryo sac in the dicot plants is
(a) 3 + 3 + 2
(b) 2 + 4 + 2
(c) 3 + 2 + 3
(d) 2 + 3 + 3.

Answer : C

Question. Study of pollen grains is called
(a) micrology
(b) anthology
(c) palynology
(d) pomology

Answer : C

Question. In angiosperm, all the four microspores of tetrad are covered by a layer which is formed by
(a) pectocellulose
(b) callose
(c) cellulose
(d) sporopollenin.

Answer : A

Question. Apomixis is
(a) formation of seeds by fusion of gametes.
(b) formation of seeds without syngamy and meiosis.
(c) formation of seeds with syngamy but no meiosis.
(d) None of the above

Answer : B

Question. Double fertilisation is exhibited by
(a) algae
(b) fungi
(c) angiosperms
(d) gymnosperms.

Answer : C

Question. Persistent nucellus is called as _______ and is found in _______.
(a) perisperm, black pepper
(b) perisperm, groundnut ‘
(c) endosperm, black pepper
(d) endosperm groundnut

Answer : A

Question. Which one of the following fruits is parthenocarpic?
(a) Jackfruit
(b) Banana
(c) Brinjal
(d) Apple

Answer : B

Question. Both, autogamy and geitonogamy are prevented in
(a) papaya
(b) cucumber
(c) castor
(d) maize.

Answer : A

Question. In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?
(a) 75
(b) 100
(c) 25
(d) 50

Answer : C

Question. Anther is generally
(a) monosporangiate
(b) bisporangiate
(c) letrasporangiate
(d) trisporangiate.

Answer : C

Question. Which of the following statement is true?
(a) Spores are gametes
(b) Spores and gametes are diploid
(c) Gametes are always haploid
(d) Spores are always diploid

Answer : C

Question. The role of double fertilisation in angiosperms is to produce
(a) cotyledons
(b) endocarp
(c) endosperm
(d) integuments.

Answer : C

Question. Eight nucleated embryo sac is
(a) only monosporic
(b) only bisporic
(c) only tetrasporic
(d) any of these.

Answer : D