Sexual Reproduction in Flowering Plants
Biology · Class 12 · CBSE
BiologyClass 12CBSEEasy
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As the anthers mature and dehydrate, the _____ separate from each other and develop into–
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40 multiple choice questions on Sexual Reproduction in Flowering Plants — Biology, Class 12. Open any question for its answer and explanation.
Q1.Pollen grain of water pollinated plants are coated by covering to prevent it from wetting.
- A.Mucilaginous covering
- B.Sporopollenin
- C.Lipid layer
- D.Protein coat
Q2.60% of the angiosperms shed their pollens at the-
- A.2-celled stage
- B.3-celled stage
- C.4-celled stage
- D.Single cell stage
Q3.Body of ovule fuses with funicle in the region as-
- A.Hilum
- B.Chalaza
- C.Micropyle
- D.Funiculus
Q4.Germ pore is aperture on exine where-
- A.Sporopollenin is absent
- B.Sporopollenin is present
- C.Pollen tube enters
- D.Germination occurs
Q5.Tetragonal structure is shape of-
- A.Anther
- B.Pollen
- C.Ovule
- D.Ovary
Q6.Essential part of flower is-
- A.Calyx and Corolla
- B.Stamen and pistil
- C.Androecium and Calyx
- D.Corolla and Gynoecium
Q7.Seed dormancy allows the plants to-
- A.Overcome favourable climatic conditions
- B.Overcome unfavourable climatic conditions
- C.Prevent germination in summer
- D.Increase germination rate
Q8.During germination, micropyle of seeds takes part in-
- A.Entry of water and oxygen
- B.Entry of pollen tube
- C.Both of the above
- D.None
Q9.In some seeds like black pepper and beet, remnants of nucellus are present. This residual, persistent nucellus is called-
- A.Endosperm
- B.Perisperm
- C.Pericarp
- D.Cotyledon
Q10.Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the ......
- A.Coleoptile
- B.Coleorhiza
- C.Scutellum
- D.Plumule
Q11.Nuclear or cellular nature of endosperm can be known at a–
- A.Free nuclear stage
- B.Cellular stage
- C.Both stages
- D.Mature stage
Q12.Endosperm in angiosperms is formed from secondary nucleus–
- A.Before fertilization
- B.After fertilization but prior to embryogenesis
- C.Simultaneously with embryo development
- D.After embryo development
Q13.The study of formation, growth and development of new individual from an egg is called
- A.Embryology
- B.Anatomy
- C.Histology
- D.Physiology
Q14.How many and which type of male gametes are produced by the male gametophyte of angiosperm?
- A.Three non-motile
- B.Three motile
- C.Two motile
- D.Two non-motile
Q15.Product of sexual reproduction generally generates:
- A.New genetic variations
- B.Identical offspring
- C.Clones
- D.Haploid offspring
Q16.After triple fusion central cell changes into–
- A.Embryo
- B.Seed
- C.Primary endosperm cell
- D.Fruit
Q17.The sequential order of pollen-pistil interaction events is:
- A.(iii) → (i) → (iv) → (ii)
- B.(ii) → (iv) → (iii) → (i)
- C.(iii) → (iv) → (ii) → (i)
- D.(ii) → (iii) → (i) → (iv)
Q18.Double fertilisation is
- A.Fusion of two male gametes with one egg
- B.Fusion of one male gamete with two polar nuclei
- C.Fusion of two male gametes of a pollen tube with two different eggs
- D.Syngamy and triple fusion
Q19.In a fertilised ovule, n, 2n and 3n conditions occur respectively in–
- A.Antipodals, zygote, endosperm
- B.Megaspore mother cell, nucellus, endosperm
- C.Egg, nucellus, microspore
- D.Endosperm, micropyle, egg
Q20.Which of the following options is correct?
- A.Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilisation.
- B.The events – from pollen deposition on stigma until pollen tubes enter the ovule – are together referred to as pollen-pistil interaction.
- C.Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen.
- D.Pistil has no ability to recognise the pollen, whether right or wrong type.
Q21.The most common type of pollination is–
- A.Entomophily
- B.Ornithophily
- C.Malacophily (by snails)
- D.Chiropterophily (by bats)
Q22.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
Q23.Transfer of pollen grains from anther to the stigma of another flower of same plant is–
- A.Geitonogamy
- B.Xenogamy
- C.Autogamy
- D.Cleistogamy
Q24.The process whereby a perfect flower is pollinated by its pollen is called
- A.Allogamy
- B.Autogamy
- C.Xenogamy
- D.Hydrogamy
Q25.Which of the following plants produce(s) chasmogamous and cleistogamous flowers?
- A.Viola (Common pansy)
- B.Oxalis
- C.Commelina
- D.All
Q26.Pollen grains can be stored in liquid nitrogen at –
- A.70°C
- B.100°C
- C.–196°C
- D.0°C
Q27.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 occurrence
- C.It causes pollen allergy
- D.All of the above
Q28.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 occurred but cytokinesis does not take place
Q29.For the formation of embryo sac, the megaspore mother cell undergoes–
- A.Two meiotic and two mitotic divisions
- B.One meiotic and three mitotic divisions
- C.Two meiotic divisions
- D.One meiotic and two mitotic divisions
Q30.In angiosperms, microsporogenesis and megasporogenesis
- A.Involve meiosis
- B.Occur in ovule
- C.Occur in anther
- D.Form gametes without further divisions.
Q31.Apocarpous condition is
- A.When there are more than one, the pistils may be free.
- B.When there are more than one, the pistils may be fused together.
- C.Both (1) and (2)
- D.None of the above.
Q32.Why G1 and G2 are genetically identical?
- A.Because they are products of meiosis one
- B.Because they are products of mitosis
- C.Because they are products of meiosis
- D.Because they are products of amitosis
Q33.The placenta is located.......
- A.Inside the ovarian cavity.
- B.Outside the ovarian cavity.
- C.Both of the above.
- D.None of the above.
Q34.Each cell of sporogenous tissue in anther is–
- A.Microspore
- B.Pollen
- C.Potential pollen or microspore mother cell
- D.Megaspore mother cell
Q35.As the anthers mature and dehydrate, the _____ separate from each other and develop into–
- A.Megaspore, embryo sac
- B.Microspores, pollen grains
- C.Pollen grains, megaspores
- D.Megaspores, microspores
Q36.Whorl of stamen is ________
- A.Androecium
- B.Gynoecium
- C.Staminode
- D.Anther
Q37.Several _____ and _____ changes are initiated which lead to the differentiation and further development of the floral primordium:
- A.Hormonal and structural
- B.Physiological and Genetic
- C.Structural and genetic
- D.Hormonal and Genetic
Q38.Mark the correct about sporophyte of angiosperm:
- A.Haploid
- B.Diploid
- C.Develop gametes
- D.All of these
Q39.The proximal part of the filament of stamen is attached to:-
- A.Thalamus or the petal
- B.Sepals or thalamus
- C.Pedicel or petiole
- D.Ovary or ovule
Q40.Diversity of structure 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