17540.Apomixis is a type of reproduction that results is the development of a/an
New organism without fusion of gametes
New organism from fusion products of gametes
Embryo from endosperm
Embryo from nucellus
17542.Double fertilization was first discovered by Nawaschin (1898) in
Lilium and Fritillaria
Mango and Sugarcane
Papaya and Pea
Brassica and Candytuft
17546.Embryo sac is called monosporic when it develops from
All the four megaspores
Only from two functional megaspores
Three megaspores
One of the megaspores out of the four megaspores which are derived from division of megaspore mother cell
17549.Endosperm of angiosperms results after fertilization from
Synergids
Secondary nucleus
Antipodal cells
Egg
17550.Fertilization in which male gametes are carried through pollen tube is known as
Porogamy
Syngamy
Siphonogamy
Chalazogamy
17552.Fragrant flowers with well developed nectaries are adapted for
Anemophily
Hydrophily
Entomophily
Zoophily
17556.______ during embryo development push he embryo deeper into the endosperm
Octan
Suspensor
Tegellum
Scutellum
17558.Plants with ovaries having only one or a few ovules, are generally pollinated by
Birds
Butterflies
Bees
Wind
17559.In an angiosperm, male plant is diploid and female plant tetraploid, endosperm will be
Haploid
Triploid
Tetraploid
Pentaploid
17560.More than one scion are grafted on single stock, the grafting is
Crown grafting
Wedge grafting
Layering
Bud grafting
17561.A clone is a group of individuals obtained through
Self pollination
Vegetative propagation
Hybridization
Cross pollination
17562.Wind pollinated flowers are
Small, producing large number of dry pollen grains
Small, brightly coloured, producing large number of pollen grains
Small, producing nectar and dry pollen
Large, producing abundant nectar and pollen
17564.Which of the following involves comparatively greater wastage of pollen?
Chiropterophily
Anemophily
Entomophily
Ornithophily
17565.A monocarpic plant is one which
has only one carpel
flowers and fruits only once in life time and thereafter dies
produces only one seed
none of these
17567.If any somatic cell of sporophyte produces gametophyte without reduction division, it is
Parthenogenesis
Apogamy
Apospory
Amphimixis
17570.In which one of the following pollination is autogamous?
Cleistogamy
Geitonogamy
Xenogamy
Chasmogamy
17571.The mature anther wall comprises an epidermis followed by a layer of radially elongated cells with fibrous bands of callose called endothelium whose function is
Nutrition
Protection
Mechanical
Dehiscence
17572.Double fertilization involves
Fusion of secondary nucleus with both male gametes
Fusion of secondary nucleus with one male gamete
Fusion of one polar nucleus with one male gamete
Any of above, depending on species
17573.Special type of grafting, in which scion unite with the stock while still attached to parent plant
Approach grafting
Wedge grafting
Side grafting
Tongue grafting
17574.In a flowering plant archesporium gives rise to
only the wall of the sporangium
both wall and the sporogenous cells
wall and the tapetum
only tapetum and sporogenous cells
17575.What is the ratio of equational divisions that take place in Cycas and angiosperms respectively leading to the formation of male gametes from pollen grains?
2 : 1
3 : 1
3 : 2
2 : 3
17576.Helobial type of endosperm is seen in
Asphodelus
Common in order Helobiales
Petunia
Both 1 and 2
17577.Asexual reproduction differs from sexual reproduction as
it does not involve genetic recombination
it does not involve meiosis and gametic unio
it produces clone
all of these
17578.Insect pollinated flowers are characterized by
large number of pollens
dry and smooth pollens
sticky and rough pollens
Heavy pollens
17580.A bisexual flower which never opens up in its life span is known as
Autogamy
Allogamy
Homogamy
Cleistogamy
17581.A hyaline, bisexual and self-fertilized flower that does not open at all, is
Chasmogamous
Apogamous
Cleistogamous
Polygamous
17582.A polygonum type of embryo sac is
7-celled and 8-nucleate
8-celled and 7-nucleate
7-celled and 7-nucleate
8-celled and 8-nucleate
17584.After fertilization synergids and antipodal cells form____.
Oospore
Endosperm
Embryo
Degenerates
17585.An interesting modification of flower shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern on the orchid flower for the female of his species and tries to copulate with it, thereby pollinating the flower. This phenomenon is called
Pseudo parthenocarpy
Pseudocopulation
Pseudo pollination
Pseudo copulation
17586.An orthotropous ovule is one in which micropyle and chalaza are
in straight line of funicle
parallel along with funicle
at right angles to funicle
parallel along with ovule
17587.Anemophillous flowers have
Sessile stigma
Small smooth stigma
Coloured flower
Large feathery stigma
17588.Anthesis is
Opening of flower bud
Pollen mother cell undergoes meiosis
Dehiscence of anthers
Stigma becoming receptive