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

Question: Which of the following is not a pollen grain caused disease?
a) Asthma
b) Bronchitis
c) Hayfever
d) Malaria
Answer: d

Question: Pollen tube enters into the embryosac through :
a) Chalaza
b) Integument
c) Filiform apparatus
d) Funiculus
Answer: c

Question: The number of ovules in an ovary may be
a) One
b) Many
c) Two
d) One to many
Answer: d

Question: Which of the following is not involved in post fertilisation events
a) Endosperm and embryo development
b) Maturation of ovules into seed
c) Maturation of ovary into fruit
d) Degeneration of nucellus
Answer: d

Question: Due to which of the following chemical deposition pollen grains are well preserved as fossils
a) Pollenkitt
b) Callose
c) Sporopollenin
d) Pectocellulose
Answer: c

Question: Wind pollinated flowers often have…..ovule in each ovary.
a) Many
b) Two
c) One
d) Three
Answer: c

Question: What would be the ploidy of cells of tetrad ?
a) n
b) 2n
c) 3n
d) 4n
Answer: a

Question: The structure in which few leaf primordia and shoot apex of monocot embryo remain enclosed is
a) Coleoptile
b) Coleorhiza
c) Epiblast
d) Epicotyl
Answer: a

Question: Regarding to number of ovules in ovary select out the odd one
a) Wheat
b) Orchids
c) Paddy
d) Mango
Answer: b

Question: Each ovule has one or two protective envelopes called
a) Micropyle
b) Integuments
c) Hilum
d) Chalaza
Answer: b

Question: Syngamy results in the formation of :
a) Zygote
b) Primary endosperm nucleus
c) Endosperm
d) Fruit
Answer: a

Question: Which of the following statements are correct ?
a) Pollen grains are rich in nutrients.
b) In some cereals like rice and wheat pollen grains lose viability within 30 minutes of their release
c) In some members of rosaceae, leguminosae and solanaceae, pollen grains maintain viability for months
d) All of the above
Answer: d

Question: What would be the genetic nature of apomictic embryo?
a) n
b) 3n
c) 2n
d) n or 2n like mother plants
Answer: d

Question: Regarding to type of pollination which of the following is odd one
a) Vallisneria
b) Hydrilla
c) Water lily
d) Zostera
Answer: c

Question: Nucellus, the mass of cells enclosed within the integuments, provide nutrition to
a) Embryosac
b) Embryo
c) Seed
d) Ovule
Answer: a

Question: Which of the following is probable reason of limited distribution of bryophytes and pteridophytes?
a) Jacketed multicellular sex organs
b) Absence of roots
c) Absence of seeds
d) Need of water for transfer of male gametes
Answer: d

Question: The genetic mechanism which inhibit pollen germination or pollentube growth in pistil so that self pollination can be prevented is known as
a) Inbreeding depression
b) Self incompatibility
c) Inter specific incompatibility
d) Heterosis
Answer: b

Question: From outer to inner what is the sequence of wall layers in anther lobes?
a) Epidermis, middle layers, tapetum, endothecium
b) Epidermis, endothecium, tapetum, middle layers
c) Epidermis, endothecium, middle layer, tapetum
d) Tapetum, middle layers, endothecium, epidermis
Answer: c

Question: In mature seed how much amount of moisture is present
a) 5-10 percent
b) 10-15 percent
c) 15-20 percent
d) 20-25 percent
Answer: b

Question: Seed is the basis of our agriculture. Which of the following is/are crucial for storage of seeds, so that they can be used as food through out the year and also to raise crop in the next season
a) Dehydration
b) Dormancy
c) Vermiculture
d) Both 1 and 2
Answer: d

Question: Perisperm is a
a) degenerate part of synergids.
b) peripheral part of endosperm.
c) degenerate part of secondary nucleus.
d) remnant of nucellus.
Answer: d

Question: Flowers are highly modified _______.
a) Root
b) Shoot
c) Stem
d) Leaves
Answer: b

Question: Pollen grains can be stored in liquid nitrogen at _________.
a) 70°C
b) 100°C
c) –196°C
d) 0°C
Answer: c

Question: Ovules are attached to a parenchymatous cushion called
a) nucellus
b) obturator
c) conducting tissue
d) placenta
Answer: d

Question: Usually, how many embryosacs are present in an ovule?
a) 1
b) 2
c) 3
d) Many
Answer: a

Question: Microsporogenesis occurs
a) on margins of leaves
b) inside the ovule
c) inside the anther
d) in essential floral organs
Answer: c

Question: Apomixis is the
a) development of plants in darkness
b) development of plants without fusion of gametes
c) inability to perceive stimulus for flowering
d) effect of low temperature on plant growth
Answer: b

Question: Endosperm may persist in mature seed in
a) Pea
b) Castor
c) Groundnut
d) Beans
Answer: b

Question: Anther is typically
a) tetrasporangiate
b) bisporangiate
c) trisporangiate
d) monosporangiate
Answer: a

Question: Filiform apparatus is found in
a) synergids
b) anther wall
c) secondary nucleus
d) egg cell
Answer: a

Question: One of the most resistant known biological material is
a) lignin
b) hemicellulose
c) sporopollenin
d) lignocellulose
Answer: c

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

Question: In which of the following plants both autogamy and geitonogamy is absent
a) Maize
b) Mango
c) Papaya
d) Castor
Answer: c

Question: Perisperm is present in
a) Mango
b) Guava
c) Black pepper
d) Pea
Answer: c

Question: Egg apparatus consists of
a) egg cell and antipodal cells
b) egg cell and central cell
c) egg cell and two synergids
d) egg cell and one synergid
Answer: c

Question: During double fertilization in plants, one sperm fuses with the egg cell and the other sperm fuses with
a) synergids cell
b) central cell
c) antipodal cell
d) nucellar cell
Answer: b

Question: Milky water of green coconut is
a) liquid chalaza
b) liquid nucellus
c) liquid endosperm
d) liquid female gametophyte
Answer: c

Question: Both chasmogamous and cleistogamous flowers are present in
a) Helianthus
b) Lommelina
c) Rosa
d) Gossypium
Answer: b

Question: Bees are important to agriculture as they
a) produce wax
b) perform pollination
c) prevent pollination
d) produce honey
Answer: b

Question: Seeds are adaptively important because
a) they maintain dormancy
b) they protect young plants during vulnerable stages
c) they store food for young plants and facilitate dispersal
d) All of the above
Answer: d

Question: Which one of the following events takes place after double fertilization?
a) The pollen grain germinates on the stigma
b) The pollen tubes enter the embryo sac
c) Two male gametes are discharged into the embryo sac
d) The PEN (Primary Endosperm Nucleus) develops into endosperm
Answer: d

Question: Which of the following statement is correct for the pollen tube?
a) It shows chemotactic movement
b) It shows only tip growth
c) It is composed of three non-cellular zones
d) It shows radial cytoplasmic streaming
Answer: a

Question: Which one of the following statement is correct?
a) Geitonogamy involves the pollen and stigma of flowers of different plants
b) Cleistogamous flowers are always autogamous
c) Xenogamy occurs only by wind pollination
d) Chasmogamous flowers do not open at all
Answer: b

Question: Which of the following statement(s) is/are incorrect ?
i) Endosperm formation starts prior to first division of zygote
ii) Angiospermic endosperm is mostly 3N while gymnospermic one is N
iii) The most common type of endosperm is nuclear
iv) Coconut has both liquid nuclear (multinucleate) and cellular endosperm
v) Milky water of green tender coconut is liquid female gametophyte
a) (i) and (ii)
b) Only (iii)
c) Only (v)
d) Only (ii)
Answer: c

Question: Study the following statements and select the correct option.
i) Tapetum nourishes the developing pollen grains
ii) Hilum represents the junction between ovule and funicle
iii) In aquatic plants, such as water hyacinth and water lily, pollination is by water
iv) The primary endosperm nucleus is triploid
a) (i) and (ii) are correct but (iii) and (iv) are incorrect
b) (i), (ii) and (iv) are correct but (iii) is incorrect
c) (ii), (iii) and (iv) are correct but (i) is incorrect
d) (i) and (iv) are correct but (ii) and (iii) are incorrect
Answer: b

Question: Which one of the following statement is incorrect?
a) When pollen is shed at two-celled stage, double fertilization does not take place
b) Vegetative cell is larger than generative cell
c) Pollen grains in some plants remain viable for months
d) Intine is made up of cellulose and pectin
Answer: a

Question: Which of the given statements are true?
i) During the development of a dicot embryo heart shaped embryo is followed by globular stage
ii) The part of the embryonal axis above the level of cotyledons is epicotyl while the part below the level of cotyledons is hypocotyl
iii) Monocot seeds possess a single cotyledon represented by scutellum
a) (i) and (ii)
b) (ii) and (iii)
c) (i) and (iii)
d) (i), (ii) and (iii)
Answer: b