Processing math: 100%

CBSE Questions for Class 12 Medical Biology Sexual Reproduction In Flowering Plants Quiz 9 - MCQExams.com

Nucellar embryo is
  • Amphimictic haploid
  • Amphimictic diploid
  • Apomictic haploid
  • Apomictic diploid
Number of nuclei present in the mature male gametophyte of angiosperms is?
  • One
  • Two
  • Three
  • Many
Development of embryo from a cell of embryo sac other than egg is an example of
  • Apospory
  • Apogamy
  • Adventive embryogeny
  • Parthenogenesis
Sporopollenin is chemically
  • Homopolysaccharide
  • Heteropolysaccharide
  • Protein
  • Fatty substance
Monocot pollen grains are generally
  • Monocolpate
  • Bicolpate
  • Tricolpate
  • Multicolpate
Anemophily is pollination through
  • Water
  • Air
  • Insects
  • Worms
As compared to oosphere, the male gamete of angiosperms is?
  • Small
  • With thin cytoplasm
  • Nonvacuolate
  • All of the above
Apomixis is the development of a new plant
  • Without fusion of gametes
  • From fusion products of gametes
  • From stem cuttings
  • From root cuttings
Sporopollenin is part of
  • Pollen grain covering
  • Oosphere covering
  • Ovule covering
  • Cell wall
One of the most resistant biological material is
  • Lignin
  • Hemicellulose
  • Lignocellulose
  • Sporopollenin
Ovule is attached to the placenta by a stalk named as
  • Funicle
  • Petiole
  • Pedicel
  • Placenta
Fragrant flowers with well developed nectaries are an adaptation for
  • Zoophily
  • Anemophily
  • Entomophily
  • Hydrophily
Despite high level of heterozygosity, the progeny derived from a seed of cross pollinated plant was found to be completely uniform. One reason can be.
  • Induced mutation
  • Polyploidy
  • Apomixis
  • Parthenocarpy
Filiform apparatus occurs in.
  • Synergids
  • Secondary nucleus
  • Antipodals
  • Egg nucleus
Maize shows
  • Cross pollination by rain
  • Cross pollination by wind
  • Cross pollination by insects
  • Self pollination
Sporogenesis is
  • Development and formation of spores
  • Production of mitospores
  • Production of meiospores
  • Formation of zygote and embryo
Polyembryony/ adventitive polyembryony occurs in
  • Carthamus
  • Citrus
  • Corchorus
  • Maize
Pollen grains are shed at.
  • One - celled stage
  • 2−3 celled stage
  • 3- celled stage
  • 4- celled stage
The phenomenon of embryo formation from a vegetative cell derived from zygote is known as
  • Aposporay
  • Diploid polyembryony
  • Adventitive polyembryony
  • Apomixis
Ubisch bodies are connected with the formation of
  • Sporopollenin
  • Intine and pollenkitt
  • Exine
  • Pollenkitt and pollinia
Malacophily is observed in.
  • Ruppia
  • Zostera
  • Lemna
  • Bignonia
Germ pore is the area where exine is
  • Thick
  • Thick and uniform
  • Uniform
  • Absent
Formation of an extra embryo from nucellus or integument is
  • Simple polyembryony
  • Adventive polyembryony
  • Vegetative polyembryony
  • Cleavage polyembryony
Formation of embryo directly from nucellus and integument is
  • Adventitive polyembryony
  • Apospory
  • Apogamy
  • Apomixis.
Pollen grains are nongreen due to
  • Absence of plastids
  • Degeneration of plastids
  • Conversion of plastids into chromoplasts
  • Attraction of vectors
Embryo of sunflower has
  • One cotyledon
  • Two cotyledons
  • Three cotyledons
  • Many cotyledons
Nymphaea shows ____- type of polyembryony
  • Cleavage polyembryony
  • Adventitive budding polyembryony
  • Endosperm polyembryony
  • Both A and B
Endosperm polyembryony is type of
  • Adventitive polyembryony
  • True polyembryony
  • False polyembryony
  • Gametophytic polyembryony
Pollination in Lotus is carried out by
  • Wind
  • Water
  • Insects
  • All the above
A true fruit is the one in which the, fleshy part of the fruit is derived from
  • Thalamus
  • Ovary
  • Inflorescene axis
  • Apocarpous gynoccium
In sporophytic polyembryony, the additional embryos develops from
  • Nucellus
  • Integument
  • First formed embryo
  • All the above
Malacophily is pollination by
  • Insects
  • Birds
  • Bats
  • Snails and slugs
Pollination by ants is
  • Malacophily
  • Myrmecophily
  • Entomophily
  • Ornithophily
In false polyembryony there is 
  • No additional embryo but only an artifact
  • The additional embryo is haploid
  • There are two or more embryo sacs
  • Am embryo sac contains two or more oospheres
Common between vegetative reproduction and apomixis is
  • Both applicable to dicots
  • Both bypass flowering phase
  • Both occur around the year
  • Both produce progeny identical to parent
Microsporophyll of Selaginella is the forerunner of which structure of angiosperm
  • Pollen sac
  • Microsporangium
  • Stamen
  • Carpel
In the given diagram the parts a, b, c, d and e.
683233_b19c78c4f0f246a9967f5061c0324076.jpg
  • a- infinite, b- exine, c- germpore, d- generative cell, e- vegetative cell
  • a- exine, b- intine, c- vegetative cell, d- germpore, e- generative cell
  • a- germpore, b- generative cell, c- intine, d- exine, e- vegetative cell
  • a- germpore, b- generative cell, c- exine, d- intine, e- vegetative cell
Plants of which one of the following groups of genera are pollinated by the same agency.
  • Triticum, Cocos, Mangifera
  • Fiscu, Kigelia, Casuarina
  • Bombax, Butea, Bauhinia
  • Salvia, Morus, Euphorbia
Which one is a gametophytic polyembryony?
  • Endosperm polyembryony
  • Adventitive polyembryony
  • Antipodal polyembryony
  • Nucellar polyembryony
Versatile anthers are connected with
  • Entomophily
  • Malacophily
  • Ornithophily
  • Anemophily
Choose the mismatched option.
  • Wind - Cannabis - Anemophily
  • Water - Zostera - Hydrophily
  • Insects - Salvia - Entomophily
  • Birds - Adansonia - Ornithophily
  • Bats - Kigelia - Chiropterophily
Match the columns.
Colum IColumn II
(a)Zoophily1.Pollination by birds
(b)Ornithophily2.Pollination by insects
(c)Entomophily3.Pollination by bats
(d)Chiropterophily4.Pollination by animals
  • a-3, b-2, c-1, d-4
  • a-1, b-2, c-3, d-4
  • a-4, b-1, c-2, d-3
  • a-4, b-2, c-1, d-3
  • a-4, b-2, c-3, d-1
In a type of apomixis known as adventive embryony, embryos develop directly from
  • Nucellus or integument
  • Zygote
  • Synergids or antipodals of embryo sac
  • Accessory embryo sacs in the ovule.
Which of the following statements is true with reference to cross pollination?
  • It most often results in higher yield of plants.
  • It occurs only in unisexual flowers.
  • It can fail to occur due to distance barrier.
  • It requires production of large number of pollen grains.
Wind pollinated flowers are
  • Small, brightly coloured, producing large number of pollen grains
  • Small, producing large number of dry pollens
  • Large producing abundant nectar and pollen
  • Small producing nectar and dry pollen
Plants with one/ a few ovules are generally pollinated by
  • Wind
  • Bees
  • Birds
  • Butterflies
A typical dicotyledonous embryo consists of
  • Radicle only
  • Radicle, embryonal axis and cotyledons
  • Cotyledons only
  • Embryo axis only
Which of the following is an example of a seed in which the endosperm is not completely consumed by the developing embryo?
  • Gram
  • Bean
  • Castor
  • Pea
Which one is resistant to enzyme action?
  • Pollen exine
  • Leaf cuticle
  • Cork
  • Wood fibre
Apomictic embryos in citrus arise from
  • Maternal sporophytic tissue in ovule
  • Antipodal cells
  • Diploid cells
  • Synergids
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Medical Biology Quiz Questions and Answers