Assignments Class 12 Biology Sexual Reproduction in Flowering Plants

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Sexual Reproduction in Flowering Plants Assignments Class 12 Biology

Question. Polar nuclei are situated in the central cell
(a) Below the egg apparatus
(b) Above the egg apparatus
(c) Below the antipodals
(d) All of the above

Question. The synergids have special cellular thickening at the micropylar tip, called
(a) Antipodals
(b) Filiform apparatus
(c) Obturators
(d) Vascular tissue

Question. Which of the following part of the flower serves as a landing platform for pollen grain ?
(a) Stigma
(b) Ovary
(c) Style
(d) Ovule

Question. Embryo develops at which end of embryosac?
(a) Micropylar end
(b) Chalazal end
(c) Funiculus
(d) Outside the ovary

Question. The microsporangia develop further and become pollen sacs. In anther these pollen sacs extends
(a) Transverslly
(b) Longitudinally
(c)Obliquely
(d) Sometimes transversaly and some times longitudinally

Question. Enclosed within the integuments is a mass of cells called
(a) Micropyle
(b) Nucellus
(c) Chalaza
(d) Embryosac

Question. An example of insect pollinated flower, in which flower provides safe place to lay eggs for insect is
(a) Vallisneria
(b) Salvia
(c) Amorphophallus
(d) Maize

Question. Endosperm development precedes embryo development, because
(a) Embryo provides nutrition to developing endosperm
(b) Endosperm provides nutrition to developing embryo
(c) Endosperm development starts after embryo development
(d) All of the above

Question. The portion of embryonal axis above the level of cotyledons is called
(a) Hypocotyl
(b) Epicotyl
(c) Tigellum
(d) Scutellum

Question. The portion of embryonal axis below the level of cotyledons is called
(a) Hypocotyl
(b) Epicotyl
(c) Tigellum
(d) Scutellum

Question. During embryo sac formation how many nuclei out of eight nucleus go through cytokinesis or wall formation?
(a) All eight
(b) Two
(c) Six
(d) Four

Question. Geitonogamy is the transfer of pollen grains from anther to stigma of another flower of the same plant is :-
(a) Functionally cross pollination
(b) Genetically self pollination
(c) Ecologically cross pollination
(d) All the above

Question. Genetically geitonogamy is
(a) Allogamy
(b) Xenogamy
(c) Autogamy
(d) Cleistogamy

Question. Which of the following pollen structure exhibits a fascinating array of patterns and designs
(Sculpturing pattern)?
(a) Germpores
(b) Exine
(c) Intine
(d) Tapetum

Question. Regarding to formation of pollen grain from microspore which of the following statement is incorrect
(a) Generative cell is bigger
(b) Vegetative cell possess irregularly shaped nucleus
(c) Generative cell floats in cytoplasm of vegetative cell
(d) Vacuole is present in vegetative cell

Question. Endosperm is completely consumed by developing embryo in
(a) Castor
(b) Coconut
(c) Wheat
(d) Pea

Question. What will be the ploidy of the cells of functional megaspore and female gametophyte respectively:
(a) n, n
(b) 2n, 2n
(c) n, 2n
(d) 2n, n

Question. Regarding to cross pollination which of the following statement is incorrect?
(a) Plants use two abiotic and one biotic agent
(b) Majority of plants use abiotic agents for pollination
(c) Production of enormous amount of pollen grains is concerned to compensate uncertainity and loss of pollens
(d) Pollination by wind is more common among abiotic pollinations

Question. About wind pollination which of the following is incorrect?
(a) Light and non sticky pollengrains
(b) Well exposed stamens
(c) Feathery stigma
(d)Highly scented flowers

Question. Chalaza represents the
(a) Tip of the ovule
(b) Base of the ovule
(c) Both (1) & (2)
(d) Stalk of the ovule

Question. Ovules generally differentiate a single megaspore mother cell in the
(a) Micropylar region
(b) Chalazal region
(c) Both 1 & 2
(d) Integument region

Question. In Castor plant :
(a) Autogamy is possible
(b) Geitonogamy is possible
(c) Both are possible
(d) Both are not possible

Question. Example of plants, which contains cleistogamous flowers :
(a) Oxalis
(b) Commelina
(c) Viola (Common pansy)
(d) All of the above

Question. In embryosac, three cells are grouped together at the micropylar end to constitute
(a) Antipodals
(b) Synergids
(c) Egg apparatus
(d) Polar nuclei

Question. Cleistogamous flowers are invariably :
(a) Autogamous
(b) Xenogamous
(c) Geitonogamous
(d) All are possible

Question. A typical flower has ______different kinds of whorl.
(a) two
(b) three
(c) four
(d) five

Question. The functions of tapetum is to
(a) produce ubisch bodies.
(b) produce pollen grains.
(c) provide nourishment to the developing pollen grains.
(d) store and protect pollen grains.

Question. Exine of pollen grain is formed of
(a) callose
(b) pecto-cellulose
(c) ligno-cellulose
(d) sporopollenin

Question. Pollen grain is liberated at
(a) one celled stage.
(b) two celled stage.
(c) three celled stage.
(d) two or three celled stage.

Question. Ovule is
(a) megasporangium
(b) megasporophyll
(c) integumented megasporangium
(d) rolled megasporophyll

Question. The point at which funiculus touches the ovule is
(a) chalaza
(b) hilum
(c) raphe
(d) endothelium

Question. The most common type of ovule is __________ .
(a) orthotropous
(b) hemitropous
(c) anatropous
(d) campylotropous

Question. Polygonum type of embryo sac/typical female gametophyte of angiosperms is
(a) 7-celled, 7-nucleate
(b) 7-celled, 8-nucleate
(c) 8-celled, 7-nucleate
(d) 8-celled, 8-nucleate

Question. Cleistogamous flowers are
(a) wind pollinated
(b) self-pollinated
(c) cross-pollinated
(d) insect pollinated

Question. Pollination by water occurs in
(a) Vallisneria
(b) Zostera
(c) Satvia
(d) All of these

Question. Vegetative fertilization involves fusion of
(a) two polar nuclei
(b) a male gamete and a synergid
(c) a male gamete and antipodal cell
(d) nucleus of a male gamete and secondary nucleus

Question. Endosperm is generally
(a) diploid
(b) triploid
(c) haploid
(d) polyploid

Question. Scutellum is present in the embryo of
(a) pea
(b) Ranunculus
(c) Triticum
(d) None of these

Question. False fruits (thalamus also contributes to fruit formation) are found in
(a) apple and pear
(b) strawberry
(c) cashewnut
(d) All of these

Question. The seed in which endosperm is used by embryo is called __________ seed.
(a) single
(b) albuminous
(c) endospermic
(d) non-endospermic

Question. Nucellar polyembryony is reported in species of
(a) Brassica
(b) Gossypium
(c) Triticum
(d) Citrus

Statement Type Questions for Class 12 Biology Sexual Reproduction in Flowering Plants

Question. Which of the following statement is incorrect about emasculation?
(a) During emasculation process, stigma is removed.
(b) Emasculated flowers are bagged in order to prevent self-pollination.
(c) Emasculation is the removal of stamens before the maturation of selected bisexual flowers.
(d) It is one of the steps for artificial hybridization.

Question. Which of the following statement about sporopollenin is incorrect?
(a) Exine is made up of sporopollenin.
(b) Sporopollenin is one of the resistant organic materials.
(c) Exine has apertures called germ pores where sporopollenin is present.
(d) Sporopollenin can withstand high temperatures and strong acids.

Question. Which one of the following statement is correct?
(a) Sporogenous tissue is haploid.
(b) Endothecium produces the microspores.
(c) Tapetum nourishes the developing pollen.
(d) Hard outer layer of pollen is called intine.

Question. Which of the following statement(s) is/are correct about self-incompatibility ?
(i) It is a device to prevent inbreeding.
(ii) It provides a biochemical block to self-fertilization.
(iii) It ensures cross-fertilization.
(iv) It is governed by pollen-pistil interaction.
(v) It is governed by series of multiple alleles.
(vi) It prevents self-pollen (from the same flower of other flowers of the same plant) from fertilizing the ovules by inhibiting pollen germination of pollen tube growth in the pistil.
(a) (i), (ii) and (iii)
(b) (i), (iv) and (v)
(c) All of the above
(d) None of the above

Question. Which of the following statements are correct for a typical female gametophyte of a flowering plant?
(i) It is 8-nucleate and 7-celled at maturity.
(ii) It is free-nuclear during the development.
(iii) It is situated inside the integument but outside the nucellus.
(iv) It has an egg apparatus situated at the chalazal end.
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (ii) and (iv)

Question. Seeds are adaptively important because
(i) they maintain dormancy.
(ii) they protect young plants during vulnerable stages.
(iii) they store food for young plants, and facilitate dispersal.
Identify the correct reasons.
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) All of the above

Assertion/Reason Type Questions for Class 12 Biology Sexual Reproduction in Flowering Plants

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion : If a pollen mother cell has 42 chromosomes, the pollen has only 21 chromosomes.
Reason : Pollens are formed after meiosis in pollen mother cell.

Question. Assertion : Photomodulation of flowering is a phytochrome regulated process.
Reason : Active form of phytochrome (PFR) directly induces floral induction in shoot buds.

Question. Assertion : Chasmogamous flowers require pollinating agents.
Reason : Cleistogamous flowers do not expose their sex organs.

Matching Type Questions for Class 12 Biology Sexual Reproduction in Flowering Plants

Question. Match the parts of gynoceium given in column I with their definition given in column II. Choose the correct combination from the options given below.‘

Column-I	Column-II
A. Funicle	I. Mass of cells within ovule with more food
B. Hilum	II. Basal part of ovule
C. Integument	III. One or Two protective layers of ovule
D. Chalaza	IV. Region where body of ovule fuses with funicle
E. Nucellus	V. Stalk of ovule

(a) A – I; B – II; C – III; D – IV; E – V
(b) A – V; B – IV; C – III; D – II; E – I
(c) A – IV; B – II; C – I; D – III; E – V
(d) A – I; B – III; C – V; D – II; E – IV

Question. Match the items given in column-I with those given in column-II and choose the correct option given below.

Column-I	Column-II
A. Parthenocarpy	I. Inactive state
B. Polyembryony	II. Meiosis and syngamy are absent
C. Apomixis	III. Occurrence of more than one embryo
D. Dormancy	IV. Seedless fruit

(a) A – I; B – II; C – III; D – IV
(b) A – IV; B – III; C – II; D – I
(c) A – IV; B – I; C – II; D – III
(d) A – III; B – II; C – I; D – IV

Question. Match the items given in column-I with their examples given in column-II and identify the correct option.

Column-I	Column-II
A. Coleorhiza	I. Grapes
B. Food storing tissue	II. Mango
C. Parthenocarpic fruit	III. Maize
D. Single seeded fruit developing	IV. Radicle from monocarpellary superior ovary
E. Membranous seed coat	V. Endosperm

(a) A – III; B – I; C – IV; D – II; E – V
(b) A – IV; B – II; C – V; D – I; E – III
(c) A – V; B – I; C – III; D – IV; E – II
(d) A – IV; B – V; C – I; D – II; E – III

Question. Which of the following is a mismatched pair?
(a) Storage of pollen grains – – 196°C
(b) Pollen allergy – Carrot grass
(c) Chasmogamous flowers – Exposed anthers and stigmas
(d) Xenogamy – Self-pollination

Diagram Type Questions for Class 12 Biology Sexual Reproduction in Flowering Plants

Question. The given figure shows a typical stamen (a) and three dimensional cut section of an anther. Identify A to D respectively marked in the figures (a & b)

(a) Anther, Petiole, Pollen sac and Megaspore
(b) Anther, Petiole, Megasporangium and Pollen grains
(c) Anther, Pedicel, Megasporangium and Pollen grains
(d) Anther, Filament, Pollen sac and Pollen grains 

Question. Identify A, B, C, D and E structures marked in the given figure of a mature embryo sac.

Question. Diagram given below shows the stages in embryogenesis in a typical dicot plant (Capsella). Identify the structures

(a) Suspensor, Radicle, Plumule, Cotyledons
(b) Hypophysis, Radicle, Plumule, Cotyledons
(c) Suspensor, Plumule, Radicle, Cotyledons
(d) Suspensor, Radicle, Plumule, Hypocotyls

Question. In the given figure of pollen grain tetrad, identify the parts marked as A, B, C, D and E.

(a) A – Germ pore, B – Generative cell, C – Intine, D – Exine, E – Vegetative cell
(b) A – Germ pore, B – Generative cell, C – Exine, D – Intine, E – Vegetative cell
(c) A – Intine, B – Exine, C – Germ pore, D – Generative cell, E – Vegetative cell
(d) A – Exine, B – intine, C – Vegetative cell, D – Germ pore, E – Generative cell

Question. Choose the option showing the correct labelling A, B, C and D in the given figure of a dicot embryo.

(a) A – Hypocotyl; B – Cotyledons; C – Root cap; D – Radicle
(b) A – Cotyledons; B – Hypocotyl; C – Root cap; D – Radicle
(c) A – Cotyledons; B – Hypocotyl; C – Radicle; D – Root cap
(d) A – Cotyledons; B – Radicle; C – Hypocotyl; D – Root cap.

Question. The given figure shows a diagrammatic view of a typical anatropous ovule, in which some parts are typical anatropous ovule, in which some parts are marked as A, B, C, & D. Identify the correct labelling of A, B, C & D from the options given below.

(a) A – Chalazal pole; B – Micropyle; C – Embryo sac; D –Nucellus
(b) A – Micropyle; B – Chalazal pole; C – Embryo sac; D – Nucellus
(c) A – Micropyle; B – Chalazal pole; C – Nucellus; D – Embryo sac
(d) A – Micropyle; B – Nucellus; C – Embryo sac;D – Chalazal pole

Critical Thinking Type Questions for Class 12 Biology Sexual Reproduction in Flowering Plants

Question. Which one of the following is not related to other three?
(a) Archaegonium
(b) Oogonium
(c) Ovule
(d) Antheridium

Question. Seed coat is not thin, membranous in
(a) coconut
(b) groundnut
(c) gram
(d) maize

Question. Product of sexual reproduction generally generates
(a) prologned dormancy.
(b) new genetic combination leading to variation.
(c) large biomass.
(d) longer viability of seeds.

Question. Which of the following processes is necessary for the complete development of male gametophyte?
(a) One meiotic cell division and two mitotic cell divisions.
(b) One meiotic cell division and one mitotic cell division.
(c) Two meiotic cell divisions and one mitotic cell division.
(d) Two mitotic cell divisions.

Question. How many meiotic division are required for the formation of 100 functional megaspores?
(a) 100
(b) 50
(c) 75
(d) 25

Question. Unisexuality of flowers prevents
(a) geitonogamy but not xenogamy.
(b) autogamy and geitonogamy.
(c) autogamy but not geitonogamy.
(d) both geitonogamy and xenogamy.

Question. Pollination occurs in
(a) bryophytes and angiosperms.
(b) pteridophytes and angiosperms.
(c) angiosperms and gymnosperms.
(d) angiosperms and fungi.

Question. Point out the odd one from the given options.
(a) Nucellus
(b) Embryo sac
(c) Micropyle
(d) Pollen grain

Question. In the embryos of a typical dicot and a grass, true homologous structures are
(a) coleorhiza and coleoptile.
(b) coleoptile and scutellum
(c) cotyledons and scutellum
(d) hypocotyl and radicle

Question. The endosperm found in angiospermic seed is different from that of gymnosperms in the sense that, in the former
(a) it is formed before fertilization while in the latter it is formed after fertilization.
(b) it is formed after fertilization.
(c) it is cellular while in the latter it is nuclear.
(d) it is nutritive while in the latter it is protective.

Question. If a diploid female plant and a tetraploid male plant are crossed, the ploidy of endosperm shall be
(a) tetraploid
(b) triploid
(c) diploid
(d) pentaploid

Question. How many pollen grains will be formed after meiotic division in ten microspore mother cells?
(a) 10
(b) 20
(c) 40
(d) 80

Question. Through which part of the embryo sac, does the pollen tube enter the embryo sac?
(a) Egg cell
(b) Persistent synergid
(c) Degenerated synergid
(d) Central cell