Class 12 topic wise Online MCQ with answers
Class 12 topic wise Online MCQ with answers
1. Reproduction in lower and higher plants
For MCQ Explanation Video lecture Click Here
1. Functional megaspore in an
angiosperm develops into an
(a) endosperm
(b) embryo sac
(c) embryo
(d) ovule.
Answer :- (b) embryo sac
2. Attractants and rewards are
required for
(a) entomophily
(b) hydrophily
(c) cleistogamy
(d) anemophily.
Answer :- (a) entomophily
3. Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by
(a) bee
(b) wind
(c) bat
(d) water.
Answer :- (b) wind
4. A dioecious flowering plant
prevents both
(a) autogamy and geitonogamy
(b) geitonogamy and xenogamy
(c) cleistogamy and xenogamy
(d) autogamy and xenogamy.
Answer :-(a) autogamy and geitonogamy
5. Double fertilisation is
exhibited by
(a) algae
(b) fungi
(c) angiosperms
(d) gymnosperms.
Answer :-(c) angiosperms
6. In majority of angiosperms
(a) egg has a filiform apparatus
(b) there are numerous antipodal cells
(c) reduction division occurs in the megaspore mother cells
(d) a small central cell is present in that embryo sac.
Answer :- (c) reduction division occurs in the megaspore mother cells
7. Pollination in water
hyacinth and water lily is brought about by the agency of
(a) water
(b) insects or wind
(c) birds
(d) bats.
Answer :-(b) insects or wind
8. The ovule of an angiosperm
is technically equivalent to
(a) megasporangium
(b) megasporophyll
(c) megaspore mother cell
(d) megaspore.
Answer :- (a) megasporangium
9. The coconut water from
tender coconut represents
(a) free nuclear proembryo
(b) free nuclear endosperm
(c) endocarp
(d) fleshy mesocarp
Answer :- (b) free nuclear endosperm
10. Which one of the following
statements is not true?
(a) Pollen grains of many species cause severe allergies.
(b) Stored pollen in liquid nitrogen can be used in the crop breeding programmes.
(c) Tapetum helps in the dehiscence of anther.
(d) Exine of pollen grains is made up of sporopollenin.
Answer :- (c) Tapetum helps in the dehiscence of anther.
11. Seed formation without
fertilisation in flowering plants involves the process of
(a) somatic hybridization
(b) apomixis
(c) sporulation
(d) budding.
Answer :- (b) apomixis
12. Which of the following
statements is not correct?
(a) Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
(b) Some reptiles have also been reported as pollinators in some plant species.
(c) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
(d) Insects that consume pollen or nectar without bringing about pollination are called pollen/ nectar robbers.
Answer :-(c) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
13. Proximal end of the
filament of stamen is attached to the
(a) placenta
(b) thalamus or petal
(c) anther
(d) connective.
Answer :- (b) thalamus or petal
14. Filiform apparatus is
characteristic feature of
(a) aleurone cell
(b) synergids
(c) generative cell
(d) nucellar embryo.
Answer :- (b) synergids
15. In angiosperms,
microsporogenesis and megasporogenesis
(a) involve meiosis
(b) occur in ovule
(c) occur in anther
(d) form gametes without further divisions.
Answer :- (a) involve meiosis
16. Flowers are unisexual in
(a) China rose
(b) onion
(c) pea
(d) cucumber.
Answer :- (d) cucumber.
17. Coconut water from a
tender coconut is
(a) innermost layers of the seed coat
(b) degenerated nucellus
(c) immature embryo
(d) free nuclear endosperm.
Answer :- (d) free nuclear endosperm.
18. Which one of the following
fruits is parthenocarpic?
(a) Jackfruit
(b) Banana
(c)
Brinjal
(d) Apple
Answer :- (b) Banana
19. Male gametophyte in
angiosperms produces
(a) single sperm and two vegetative cells
(b) three sperms
(c) two sperms and a vegetative cell
(d) single sperm and a vegetative cell.
Answer :- (c) two sperms and a vegetative cell
20. Which of the following are
the important floral rewards to the animal pollinators ?
(a) Floral fragrance and calcium crystals
(b) Protein pellicle and stigmatic exudates
(c) Colour and large size of flower
(d) Nectar and pollen grains
Answer :- (d) Nectar and pollen grains
21. Which one of the following
may require pollinators, but is genetically similar to autogamy?
(a) Apogamy
(b)
Cleistogamy
(c)
Geitonogamy
(d) Xenogamy
Answer :- (c) Geitonogamy
22. Which one of the following
statements is not true?
(a) The flowers pollinated by flies and bats secrete foul odour to attract them.
(b) Honey is made by bees by digesting pollen collected from flowers.
(c) Pollen grains are rich in nutrients and they are used in the form of tablets and syrups.
(d) Pollen grains of some plants cause severe allergies and bronchial afflictions in some people.
Answer :- (c) Pollen grains are rich in nutrients and they are used in the form of tablets and syrups.
23. The hilum is a scar on the
(a) fruit, where style was present
(b) seed, where micropyle was present
(c) seed, where funicle was attached
(d) fruit, where it was attached to pedicel.
Answer :- (c) seed, where funicle was attached
24. Transmission tissue is
characteristic feature of
(a) dry stigma
(b) wet stigma
(c) hollow style
(d) solid style.
Answer :- (d) solid style.
25. Which one of the following
shows isogamywith non flagellated gametes?
(a) Sargassum
(b) Ectocarpus
(c) Ulothrix
(d) Spirogyra
Answer :- (d) Spirogyra
26.
An aggregate fruit is one which develops from
(a) multicarpellary syncarpous gynoecium
(b) multicarpellary apocarpus gynoecium
(c) complete inflorescence
(d) multicarpellary superior ovary.
Answer :- (b) multicarpellary apocarpus gynoecium
27.Pollen tablets are available in the market
for
(a) in vitro fertilization
(b) breeding programmes
(c) supplementing food
(d) ex situ conservation
Answer :- (c) supplementing food
28. Function of
filiform apparatus is to
(a) recognize the suitable pollen at stigma
(b) stimulate division of generative cell
(c) produce nectar
(d) guide the entry of pollen tube
Answer :- (d) guide the entry of pollen tube
29. Nonluminous seed is
produced in
(a) maize
(b) castor
(c) wheat
(d) pea.
Answer :- (d) pea.
30. Meiosis takes place
in
(a) gemmule
(b) megaspore
(c) meiocyte
(d) conidia
Answer :- (c) meiocyte
31. Seed coat is
not thin, membranous in
(a) groundnut
(b) gram
(c) maize
(d) coconut.
Answer :- (d) coconut.
32. Megasporangium is
equivalent to
(a) nucellus
(b) ovule
(c) embryo sac
(d) fruit
Answer :- (a) nucellus
33. Which one of the
following statements is correct?
(a) Endothecium produces the microspores.
(b) Tapetum nourishes the developing pollen
(c) Hard outer layer of pollen is called intine.
(d) Sporogenous tissue is haploid.
Answer :- (b) Tapetum nourishes the developing pollen.
34. Product of sexual
reproduction generally generates
(a) new genetic combination leading to variation
(b) large biomass
(c) longer viability of seeds
(d) prolonged dormancy.
Answer :- (a) new genetic combination leading to variation
35. Even in absence of pollinating
agents seed setting is assured in
(a) Camelina
(b) Zostera
(c) Salvia
(d) fig.
Answer :- (a) Camelina
36. Megaspores are
produced from the megaspore mother cells
after
(a) mitotic division
(b) formation of thick wall
(c) differentiation
(d) meiotic division
Answer :- (d) meiotic division
37.What is common
between vegetative reproduction and apomixis?
(a) Both are applicable to only dicot plants
(b) Both bypass the flowering phase
(c) Both occur round the year
(d) Both produce progeny identical to the parent
Answer :- (d) Both produce progeny identical to the parent
38. Unisexuality of
flowers prevents………………
(a) geitonogamy, but not xenogamy
(b) autogamy and geitonogamy
(c) autogamy, but not geitonogamy
(d) both geitonogamy and xenogamy
Answer :- (c) autogamy, but not geitonogamy
39.Which one of
the following is resistant to enzyme
action?
(a) Pollen exine
(b) Leaf cuticle
(c) Cork
(d) Wood fibre.
Answer :- (a) Pollen exine
40.What is the
direction of micropyle in anatropous ovule?
(a) Upward
(b) Downward
(c) Right
(d) Left.
Answer :- (b) Downward
41.Eight nucleated
embryo sac is
(a) only monosporic
(b) only bisporic
(c) only tetrasporic
(d) any of these
Answer :- (d) any of these
42. Entry of pollen
tube through micropyle is
(a) chalazogamy
(b) mesogamy
(c) porogamy
(d) pseudogamy
Answer :- (c) porogamy
43.Study of formation,
growth and development of
new individual from an egg is
(a) apomixis
(b) embryology
(c) embryogeny
(d) cytology.
Answer :- (b) embryology
45.Double
fertilization is fusion of ………
(a) two eggs
(b) two eggs and polar nuclei with pollen nuclei
(c) one male gamete with egg and other with synergid
(d)one male gamete with egg and other with nucleus..
Answer :- (d) one male gamete with egg and other with secondary nucleus.
46. Which ones produce
androgenic haploids in anther cultures?
(a) Anther wall
(b) Tapetal layer of anther wall
(c) Connective tissue
(d) Young pollen grains
Answer :- (d) Young pollen grains
47.Which is correct?
(a) Gametes are invariably haploid
(b) Spores are invariably haploid
(c) Gametes are generally haploid
(d) Both spores and gametes are invariably haploid
Answer :- (a) Gametes are invariably haploid
48.Development of an
organism from female gamete/egg without involving
fertilization is
(a) adventitive embryony
(b) polyembryony
(c) parthenocarpy
(d) parthenogenesis.
Answer :- (d) parthenogenesis.
49.Perisperm is……………
(a) remnant of endosperm
(b) persistent nucellus
(c) peripheral part of endosperm
(d) disintegrated secondary nucleus
Answer :- (b) persistent nucellus
50. Parthenogenesis is
(a) development of embryo without fertilization
(b) development of fruit without fertilization
(c) development of fruit without hormones
(d) development of embryo from egg without fertilization.
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