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Sexual Reproduction in Flowering Plants Class 12 MCQs Questions with Answers
Solve this Sexual Reproduction in Flowering Plants Multiple Choice Questions of Class 12 Biology Chapter 2 MCQ, so as not to miss out on any concept from being clear about what they mean!
Select the correct answer
Question 1.
Among the terms listed below those that of are not correct names for a floral whorl are:
(i) Androecium
(ii) Carpel
(iii) Corolla
(iv) Sepal.
(a) (i) and (iv)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (i) and (iii)
Answer
Answer: (c) (ii) and (iv)
Question 2.
Embryo sac is to ovule as is to an anther.
(a) Stamen
(b) Filament
(c) Pollen grain
(d) Androecium.
Answer
Answer: (c) Pollen grain
Question 3.
in a typical complete, bisexual and hypogynous flower the arrangements of floral whorls on the thalamus from the outer most to the inner most is:
(a) Calyx, corolla, androecium and gynoecium
(b) Calyx, corolla, gynoecium and androecium
(c) Gynoecium, androecium, corolla and calyx
(d) Androecium, gynoecium, corolla and calyx
Answer
Answer: (a) Calyx, corolla, androecium and gynoecium
Question 4.
A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is :
(a) Plant is dioecious and bears only pistillate flowers
(b) Plant is dioecious and bears both pistillate and staminate flowers
(c) Plant is monoecious
(d) Plant is dioecious and bears only staminate flowers.
Answer
Answer: (d) Plant is dioecious and bears only staminate flowers.
Question 5.
The outermost and innermost wall layers of microsporangium in an anther are respectively:
(a) Endothecium and tapetum
(b) Epidermis and endodermis
(c) Epidermis and middle layer
(d) Epidermis and tapetum.
Answer
Answer: (d) Epidermis and tapetum.
Question 6.
During microsporogenesis, meiosis occurs in :
(a) Endothecium
(b) Microspore mother cells
(c) Microspore tetrads
(d) Pollen grains.
Answer
Answer: (b) Microspore mother cells
Question 7.
From among the sets of terms given below, identify those that are associated with the gynoecium.
(a) Stigma, ovule, embryo sac, placenta
(b) Thalamus, pistil, style, ovule
(c) Ovule, ovary, embryo sac, tapetum
(d) Ovule, stamen, ovary, embryo sac
Answer
Answer: (a) Stigma, ovule, embryo sac, placenta
Question 8.
Starting from the innermost part, the correct sequence of parts in an ovule is :
(a) egg, nucellus, embryo sac, integument
(b) egg, embryo sac, nucellus, integument
(c) embryo sac, nucellus, integument, egg
(d) egg, integument, embryo sac, nucellus.
Answer
Answer: (b) egg, embryo sac, nucellus, integument
Question 9.
From the statements given below choose the option that is true for a typical female gametophyte of a flowering plant:
(i) It is 8-nucleate and 7-celled at maturity
(iv) 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)
Answer
Answer: (c) (i) and (ii)
Question 10.
Autogamy can occur in a chasmogamous flower if:
(a) Pollen matures before maturity of ovule
(b) Ovules mature before maturity of pollen
(c) Both pollen and ovules mature simultaneously
(d) Both anther and stigma are of equal lengths.
Answer
Answer: (c) Both pollen and ovules mature simultaneously
Question 11.
Choose the correct statement from the following:
(a) Cleistogamous flowers always exhibit autogamy
(b) Chasmogamous flowers always exhibit geitonogamy
(c) Cleistogamous flowers exhibit both autogamy and geitonogamy
(d) Chasmogamous flowers never exhibit autogamy.
Answer
Answer: (b) Chasmogamous flowers always exhibit geitonogamy
Question 12.
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by:
(a) Insects
(b) Water
(c) Wind
(d) Animals.
Answer
Answer: (c) Wind
Question 13.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
(a) Monoecious plant bearing unisexual flowers
(b) Dioecious plant bearing only male or female flowers
(c) Monoecious plant with bisexual flowers
(d) Dioecious plant with bisexual flowers.
Answer
Answer: (b) Dioecious plant bearing only male or female flowers
Question 14.
In a fertilised embryo sac, the haploid, diploid and triploid structures are :
(a) Synergid, zygote and primary endosperm nucleus
(b) Synergid, antipodal and polar nuclei
(c) Antipodal, synergid and primary endosperm nucleus
(d) Synergid, polar nuclei and zygote.
Answer
Answer: (a) Synergid, zygote and primary endosperm nucleus
Question 15.
In an embryo sac, the cells that degenerate after fertilisation are :
(a) Synergids and primary endosperm cell
(b) Synergids and antipodals
(c) Antipodals and primary endosperm cell
(d) Egg and antipodals.
Answer
Answer: (b) Synergids and antipodals
Question 16.
While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant?
(a) Bagging of female flower
(b) Dusting of pollen on stigma
(c) Emasculation
(d) Collection of pollen.
Answer
Answer: (c) Emasculation
Question 17.
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.
Answer
Answer: (c) Cotyledons and scutellum
Question 18.
The phenomenon observed in some plants wherein parts of the sexual apparatus are used for forming embryos without fertilisation is called:
(a) Parthenocarpy
(b) Apomixis
(c) Vegetative propagation
(d) Sexual reproduction.
Answer
Answer: (b) Apomixis
Question 19.
In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspore develops into an embryo sac, its nuclei would be:
(a) Haploid
(b) Diploid
(c) A few haploid and a few diploid
(d) With varying ploidy.
Answer
Answer: (b) Diploid
Question 20.
The phenomenon wherein the ovary develops into a fruit without fertilisation is called:
(a) Parthenocarpy
(b) Apomixis
(c) Asexual reproduction
(d) Sexual reproduction
Answer
Answer: (a) Parthenocarpy
Assertion and Reason Type Questions
These questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses.
(a) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
(c) If Assertion is true but the Reason is false.
(d) If both Assertion and Reason are false.
Question 21.
Assertion: The first part of dicot embryo to appear above ground is the leaf.
Reason: Leaves increase the size of plant.
Answer
Answer: (d) If both Assertion and Reason are false.
Question 22.
Assertion: Megaspore mother cell undergoes meiosis to produce four megaspores.
Reason: Megaspore mother cells and megaspores both are haploid.
Answer
Answer: (c) If Assertion is true but the Reason is false.
Question 23.
Assertion: Ovule after fertilisation forms the fruit.
Reason: The fruits contain diploid endosperm.
Answer
Answer: (d) If both Assertion and Reason are false.
Question 24.
Assertion: Insects visit flowers to gather honey.
Reason: Attraction of flowers prevents the insects from damaging other parts.
Answer
Answer: (c) If Assertion is true but the Reason is false.
Question 25.
Assertion: 7-celled, 8-nucleate and monosporic embryo sac is called Polygonum type of embryo sac.
Reason: It was discovered by Hofmeister for the first time in Polygonum.
Answer
Answer: (c) If Assertion is true but the Reason is false.
Question 26.
Assertion: Seed dispersal by wind is called anemochory.
Reason: The seeds are flight, minute and may be winged.
Answer
Answer: (a) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
Question 27.
Assertion: If an endosperm cell of angiosperm contains 24 chromosomes, the number of chromosomes in each cell of root will be 16.
Reason: As endosperm is triploid and root cells are diploid, the chromosome number in each root cell will be 16.
Answer
Answer: (a) If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
Question 28.
Assertion: Seeded plants are highly evolved.
Reason: In spermatophyta, seeds are formed.
Answer
Answer: (b) If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
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