Please refer to Chapter 2 Sexual Reproduction in Flowering Plants MCQ Class 12 Biology with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Biology. Students should refer to MCQ Questions for Class 12 Biology with Answers to score more marks in Grade 12 Biology exams. Students should read the chapter Sexual Reproduction in Flowering Plants and then attempt the following objective questions.

MCQ Questions Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants

The Sexual Reproduction in Flowering Plants MCQ Class 12 Biology provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Microsporangium is generally surrounded by 4 wall layers. Which of the following 3 wa!l layers perform the function of protection and help in the dehiscence of anther to release the pollen?     
(a) Epidermis, tapetum, endothecium
(b) Epidermis, aril, endothecium
(c) Epidermis, endodermis, mesocarp
(d) Epidermis, middle layer and ndothecium

Question. A monocarpic plant in are which-
(a) Has only are carpel
(b) Flowers and gruits only once in life time and thereafter dies
(c) Produces only seed
(d) None of the above

Question. Double fertilisation was first discovered by nawaschin (1898) in-     
(a) Lilium and Frittilaria
(b) Mango and sugarcane
(c) Papaya and Pea
(d) brassica and Condtuft

Question. In typical embryo sac, the nuclei are arranged as –     
(a) 3 + 2+ 3
(b)3 + 3 + 2
(c) 2 + 3 + 3
(d) 2 + 4 + 2

Question. Maturation of male and female sex organo at different times in known as-
(a) Herkogamy
(b) Dichgamy
(c) Polygamy
(d) Apogamy

Question. Which of the following is correct about Parthenium (Carrot grass)?     
(a) Parthenium came into India as a contaminant with imported wheat
(b) It has become ubiquitous in occurence
(c) It causes pollen allergy
(d) All of the above

QuestionGo through the following statements –
I. Flowers are bisexual and homogamous maturing anther and stigma of a flower at the same time.
II. Mechanical devices bringing anthers and stigma close together in a bisexual chasmogamous flower.
III. Cleistogamy (bisexual flowers remain closed)
IV. Anther and stigma of an intersexual flower mature, in bud condition. The above contrivances favour –
(a) allogamy
(b) Autogamy
(c)Xenogamy
(d) Cross pollination

Question. Which of the following statements is correct. 
(a) Majority of plants use biotic agents for pollination
(b) Pollination by wind is more common among abiotic pollinations
(c) Pollination by water is quite rare in flowering plants
(d) AII

Question. Which of the following is false? 
(a) Wind-pollination is quite common in grasses
(b) Hydrophily is limited to about 30 genera mostly monocots
(c) Both wind and water pollinated flowers are not very colourful and do not produce nectar .
(d) None of the above

Question. Which of the following statements is false?       
I. Pollen grains represents immatured male gametophyte
II. In angiosperms partially developed male gametophytes are pollinated
III. Generative cell is siponogenous while vegetative cell is spermatogenous
IV. Formation and differentiation of pollen grains is called microsporogenesis
V. Hay fever is a pollen allergy
VI. Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases
VII. Pollen grains are poor in nutrients.
(a) I and VII
(b) III and VII
(c)IVandV
(d) VI and VII

Question. Embryo sac is monosporic when it develops from –
(a) One of the four megaspores of a megaspore mother cell (MMC)
(b) 3 megaspores of a megaspore tetrad
(c) 2 megaspores
(d) The MMC where meiosis has occured but cytokinesis does not take place

Question. An interesting modification of flavor shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern an the orchid flower for the female of lin species and tries to copulate with it, thereby pollinating the flower, thin phenomena is called-     
(a) Pseudopartherocary
(b) Mimicry
(c) Pseudopollination
(d) Pseudocopulation

Question. Pollen grains can be stored in liquid nitrogen at –     
(a) 70°C
(b)100`°C`
(c) –196ºC
(d) 0º C

Question. Which of the following sequences is correct for microsporogenesis?     
(a).Micro S.M.C (2N) Mltosis> Microspore tetrad (2N) Meios’V Microspore (N)
(b) Micro S.M.C (2N) ————> Microspore tetrad (N) ———> Microspores (N)
(c) Microspore tetrad (2N)—’ OSIS> Microspores
(d) Micro S.M.C (2N) MltOSIS> Microspore tetrad (2N) Mltosis» Microspores (2N)

Question. Which of the following sequences of development of embryo sac / female gametophyte is correct?     
(a) Nucellus —^ Megaspore —> Embryo sac
(b) Nucellus —*> Megaspore mother cell —> Megaspore —^ embryo sac
(c) Nucellus —^ Megasporangium —+> Megaspore —*> Embryo sac
(d) Nucellus —^ Megagametophyte —^ Megaspore —^ Embryo sac

Question. The proximal part of filament of stamen is attached to –     
(a)Thalamusorthepetal
(b) Sepals or thalamus
(c) Pedicel or petiole
(d) Ovary or ovule

Question. 8 nucleated embryo sacs are-
(a) monopolie only
(b) Bispolic only
(c) Teliasporic only
(d) Any of these

Question. Which type of association in found in between entomosphilous flower and pollinating apeat-
(a) Mutualism
(b) Commercialism
(c) Cooperation
(d) None of these

Question. Geitonogamy is –     
(a) Functionally cross pollination involving a pollinating agent
(b) genetically it is similar to autogamy since the pollen grains come from the same plant
(c) Functionally and genetically autogamy
(d) Both a and b are correct

Question. Which of the following points is incorrect about sporopollenin?     
(a) It is one of the most resistant organic material known
(b) It can withstand high temperature and strong acids and alk
(c) 2 enzymes that degrade sporopollenin are known so far .
(d) Pollen grains are well preserved as fossils because of presence of sporopollenin

Question. Which of the following is false about xenogamy?     
(a) It is the transfer of pollen grains from anther to stigma of another plant of the same species
(b) It produces genetic variation
(c) it is genetically and ecologically (= functionally) cross pollination
(d) It occurs in Cleistogamous flowers

Question. If testa in removed from the water soaked gram seed, the remaining structure in-     
(a) Full mature embryo
(b) Cotyledom with endosperm
(c) Cotyledom filled with starch
(d) None of the above

Question. Which of the following plants produce(s) chasmogamous and Cleistogamous flowers?
(a) Viola (Common pansy) 
(b) Oxa//s
(c) Commelina
(d)AII

Question. Which of the following has the least pollen viability?     
(a) Cereals like wheat and rice
(b) Members of Rosaceae
(c) Members of Leguminoseae
(d) Members of Solanaceae

Question. Which of the following is false false?     
(a) Flowers do not exist only for us to be used for our own selfishness
(b) All flowering plants show sexual reproduction
(c) Gymnosperms, being nonflowering, do not show sexual reproduction
(d) Flowers are objects of aesthetic, ornamental, social, religious and cultural value

Question. Autogamy is –     
(a) Transfer of pollen grains from anther to stigma of the same flower
(b) transfer of pollen grains from anther to stigma of another flower
(c) Pollination between two flower
(d) Maturation of anther and stigma at different times

Question. Embeyo sac in also know as-
(a) MIcrogametophyte
(b) Megagametophyte
(c) Microsporangium
(d) Megasporagium

Question. In angiosperms pollination occurs when pollen grains are in –     
(a) 2-celled stage
(b) 3-celled stage
(c) 2 or 3 celled stage
(d) Uninucleate stage ;

Question. The term pollination signifies –
(a) Dehiscence of anther
(b) The transfer of pollen grains from anther to stigma
(c) The transfer of pollen grains from anther to the stigma of the same flower
(d) Formation of pollinia

Question. During the formation of embryo sac from megaspore mitotic divisions occurs. These mitotic  divisions are
(a) Strictly free nuclear
(b) Strictly cellular
(c) Strictly reduction
(d) Strictly cytoplasmic

Question. Anthesis in a phenomena which refers to- 
(a) Formation of pollen
(b) Development of anther
(c) Operning of flower bud
(d) Reception of pollen

Question. Which of the following devices is not used by plants to prevent autogamy –
(a) Self-incompatibility
(b) Production of unisexual flowers
(c) Heterostyly
(d) Production of Cleistogamous flowers

Question. The viability of pollen grains depends upon –     
(a) Prevailing temperature
(b) Prevailing humidity
(c) Genetic potenti ty of the concerned species
(d) Members of Solanaceae

Question. Pollination occuring in closed flowers is –
(a) Bud pollination
(b) Cleistogamy
(c) Chasmogamy
(d) Allogamy

Question. Diversity of structures of the inflorescences, flower and floral parts –     
(a) Are responsible for making our garden beautiful
(b) Ensure self pollination
(c) Are adaptations to ensure formation of end products of sexual reproduction
(d) Ensure anemophily

Question. In Tapegrass (Vallisneria) – 
(a) The female flower reach the surface of water by long stalk arid male flowers / pollen grains are released on to the surface
(b) Monoecism is found
(c) Pollen grains or flowers are actively carried by water current
(d) All the above are correct

Question. The female gametophyte /embryo sac of typical dicot (Polygonum) or monosporic embryo sac is –     
(a) 7-celled and 7-nucleate
(b) 8-celled and 8-nucleate
(c) 7-celled and 8-nucleate
(d) 8-celled and 7-nucleate

Question. Cleistogamous flowers produces assured seed-set even in the absence of pollinator – why? 
(a) Because they have fragrance
(b) Because they remain open
(c) Because they are autogamous
(d) Because they are colourful

Question. Egg apparatus of an embryo sac consists of –
(a) Egg cell only .
(b) Egg cell + 3 antipodal cells
(c) One oosphere (egg) + 2 synergids
(d) One oosphere (egg) + 2 synergids + 2 antipodal cells

Question. The root cell of wheat plant has 42 chromosomes what would be the number of chromosomes in the synergid cell-
(a) 7
(b) 14
(c) 21
(d) 28

Question. The ploidy levels of the cells of the nucellus, MMC, the functional megaspore and female gametophyte – 
(a) 2N, N, 2N, N
(b) N, N, 2N, N
(c) 2N, 2N, N, N
(d) N, 2N, 2N, N

Question. Chasmogamy is pollination in –
(a) Bud condition
(b) Closed flowers
(c) Unrelated flowers
(d) Opened flowers

Question. The process whereby a perfect flower is pollinated by its pollen is called –
(a) Allogamy
(b) Autogamy
(c) Xenogamy
(d)Hydrogamy

Question. Go through the following points.
I. Dicliny(unisexu ty of flower)
II. Dichogamy (protoandry or protogyny)
III. Self sterility / self incompatibility
IV. Heterostyly
V. Herkogamy (Barrier between anther and stigma of a bisexual homogamous flower)
(a) Geitonogamy
(b) Xenogamy
(c) Allogamy
(d) Autogamy

Question. Transfer of pollen grains from anther to the stigma of another flower of same plant is –
(a) Geitonogamy
(b) Xenogamy
(c) Autogamy
(d) Cleistogamy

Question. Subterranean Cleistogamous and geophilous flowers occur in-  
(a) Viola
(b) Commelina
(c) Ficus bengalensis
(d) Anthocephalus

Question. The development of fruit without fertilisation is-
(a) Parthenogenesis
(b) Parthenocapy
(c) Apomixis
(d) Apogamy

Question . The largest cell in an embryo sac is –
(a) Egg
(b) Central cell
(c)Synergid
(d) Antipodal cell

Question. In nature, allogamy is met within ________ surely-
(a) unisexual flowers
(b) Neuter flowers
(c) Underground flowers
(d) Bisexual flower

Question. Contrivance for self-pollination/autogamy is  –
(a)Homogamy
(b) bisexu ty
(c) Cleistogamy
(d) AII

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