CBSE Questions for Class 12 Medical Biology Sexual Reproduction In Flowering Plants Quiz 13 - MCQExams.com

Which of the following statement is not correct with respect to Anemophily?
  • It is the most primitive form of pollination
  • Pollen grains are light and sticky
  • Stamen & stigma are well exposed
  • Anemophily is quite common in grasses
Pollen kit is present in
  • Anemophilly
  • Entamophily
  • Malacophilly
  • Zoophilly
Which of the following event mainly affected in the absence of generative cell within pollen-grain?
  • Entry of pollen-tube inside the embryo sac
  • Double fertilization
  • Growth of pollen-tube inside the style
  • All of the above
Nucellar embryo is?
  • Apomictic embryo
  • Amphimictic haploid
  • Adventitive embryony
  • Amphimictic diploid
Read the following statements:
Which of the above statements are correct?
(i) Wheat, maize barley, castor and sunflower seeds are endospermic or albuminous
(ii) Most zygotes divide only after certain amount of endosperm is formed
(iii) Though the seed differ greatly, the early stages of embryo development is similar in both monocots and dicots
(iv) The zygote divides to form proembryo and subsequently globular, heart-shaped and mature embryo.
(v) Epicotyl and hypocotyl are absent in monocot seeds
  • (i),(ii),(iii)and (iv)
  • (i),(ii)and (iii)
  • (i),(iii)and( v)
  • (iii),(iv)and (v)
  • (i),(v) and (ii)
In the embryos of a typical dicot and grass, true homologous structures are?
  • Colerrhiza and coleoptile
  • Coleoptile and scutellum
  • Cotyledons and scutellum
  • Hypocotyl and radicle
Gynoecium with fused carpels?
  • Syncarpous
  • Apocarpous
  • Syngenecium
  • None of these
Embryo in sunflower has
  • Two cotyledons
  • Many cotyledons
  • No cotyledon
  • One cotyledon
Pro-embryo becomes heart shaped due to development-
  • Cotyledons
  • Vascular Cambium
  • Radical
  • Epicotyls
Fruits of Banyan tree develops from
  • Raceose inflorescene
  • Cymose inflorescene
  • Hypanthodium inflorescene
  • Cyathium inflorescene
Which of the following is the site of pollen deposition?
  • Placenta
  • Thalamus
  • Anther
  • Stigma
Polyploidy can result from?
  • Double fertilization
  • Polyspermy
  • Diploid gametes
  • All of the above
Among the following statement related to pollens, choose the correct one.

Statement I : In $$40$$% of angiosperms pollen grains are shed at 3-celled stage.
Statement II : Intine is made of cellulose and pectin and it is discontinuous with                                germ pores.
  • Both $$I$$ and $$II$$ are correct
  • Both $$I$$ and $$II$$ are incorrect
  • $$I$$ is correct and $$II$$ incorrect
  • $$I$$ is incorrect and $$II$$ correct
Which of the following is incorrect?
  • Mango and coconut are drupe fruit
  • According to Euro norm IV sulphur content for petrol is 50 ppm
  • $$CO_2$$ and other poisonous gases cause pollution
  • Apple is a true fruit
When pollen grain is shed at 3-celled stage, name the cells it contains. 
  • 1 vegetative cell and 2 male gametes
  • 2 vegetative cell and 1 male gamete `
  • 2 generative cells and 1 male gamete
  • 2 male gametes and 1 generative cell
Which statement is correct for apomixis?
  • Without fertilisation diploid embryo forms
  • With fertilisation diploid embryo forms
  • Without fertilisation haploid embryo cell form embryo
  • With fertilisation haploid embryo cell form embryo
Which of the following is false fruit?
  • Groundnut
  • Mustard, Mango
  • Citrus
  • Apple, strawberry
The process of removal of anther from the flower bud before it dehisces is called as?
  • Emasculation
  • Bagging
  • Embryo rescue
  • Budding
Which plants die after flowering?
  • Lotus
  • Bamboo
  • Chrysanthemum
  • Butea
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are large and feathery. These modifications facilitate pollination by:
  • Insects
  • Water
  • Wind
  • Animals
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
  • Monoecious plant bearing unisexual flowers.
  • Dioecious plant bearing only male or female flowers.
  • Monoecious plant with bisexual flowers.
  • Dioecious plant with bisexual flowers.
While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant:
  • Bagging of female flower.
  • Dusting of pollen on stigma.
  • Emasculation.
  • Collection of pollen.
The phenomenon observed in some plants wherein parts of the sexual apparatus is used for forming embryos without fertilisation is called:
  • Parthenocarpy.
  • Apomixis.
  • Vegetative propagation.
  • Sexual reproduction.
Why flowers are generally so colourful and fragrant?
  • To attract insects.
  • To avoid insects.
  • To kill insects.
  • To scare insects.
In sexual reproduction, a male and female gametes fuse to form
  • Embryo
  • Spore
  • Zygote
  • Flower
Monoecious, female, pedicel, sepals and petals, thalamus, torus, receptacle, male, unisexual, bisexual, dioecious.
Use the above phrases to fill in the blanks.

Flower is a condensed shoot which is specialized to carry out sexual reproduction. It is borne over a stalk called ........ (1) .............
There is a broad base called .........(2) ............
Thalamus bears four types of floral organs-sepals, petals,stamens and carpels. ................(3) ........................ have no direct function in sexual reproduction.
They are called accessory or non-essential floral organs.
Stamens and carpels are essential floral organs as they take part in sexual reproduction.
 Stamens are .........(4) ........... reproductive organs while carpels are ......... (5) .......... reproductive organs.
Flowers are called ..........(6) ............. if they have either stamens (male or staminate) or carpels (female or pistillate), e.g., papaya, watermelon.
 They are known as ..........(7)..........if the flowers possess both stamens and carpels, e.g.,Mustard, Hibiscus. Plants with unisexual flowers are called .......... (8) .......... if both male and female flowers occur on the same individual (e.g., Maize, Watermelon).
They are called ........... (9) ........ if male and female flowers are found on different individuals (e.g., Papaya).
  • (I) Pedicel, (2) thalamus, (3) Sepals and petals, (4) male, (5) female, (6) unisexual, (7) bisexual, (8) monoecious, (9) dioecious
  • (I) Dioecious, (2) thalamus, (3) sepals and petals, (4) male, (5) female, (6) unisexual, (7) bisexual, (8) monoecious, (9) pedicel
  • (I) Dioecious, (2) thalamus, (3) sepals and petals, (4) male, (5) female, (6) bisexual, (7) unisexual, (8) monoecious, (9) pedicel
  • (I) Dioecious, (2) sepals and petals, (3) thalamus, (4) male , (5) female, (6) bisexual, (7) unisexual, (8) monoecious, (9) pedicel
The pollination mechanism of Calotropis is referred as ..................
  • Jaculator mechanism
  • Lever mechanism
  • Translator mechanism
  • Siphon mechanism
Tretradynamous androecium is with
  • Four equal length stemens
  • Outer 2 short and inner 4 long stamens
  • Outer 2 long and inner 2 short stamens
  • Outer 4 short and inner 2 long stamens
Which of the following plants in Brassicaceae family have two stamens in flower?
  • Raphanus
  • Nasturtium
  • Coronopus
  • Brassica
Hypanthodium inflorescence is pollinated by 
  • Water
  • Blastophaga
  • Air
  • Snails
Read the following about the agents of seed dispersal.
a. Xanthium and urena by animals.
b. Drumstick and maple by wind.
c. Groundnut and areca nut by birds.
d. Madar and sunflower by insects.
Select the alternative which includes all the correct statements.
  • a and b
  • a and c
  • c and d
  • b and c
Despite high level of heterozygosity, the progeny derived from seed of a cross pollination plant was found to be completely uniform. One reason for this may the phenomenon of 
  • Parthenocarpy
  • Apomixis
  • Induced mutation
  • Polyploidy
Double fertilization in angiosperms was discovered by ..................
  • J.C. Bose
  • Strasburger
  • Maheshwari
  • Nawaschin
Flowers which have only stamens are called as
  • Male flowers
  • Staminate flowers
  • Both of (A) and (B)
  • Pistillate flowers
What is that condition when androecium consists of 4 long and 2 short stamens? 
  • Didynamous
  • Tetradynamous
  • Diplostemonous
  • None of the above
Population whose members reproduce asexually are called
  • Allopatric
  • Apomictic
  • Amphimictic
  • Panmictic
Pick up the correct statement for androecium of cucurbitaceae family.
  • Indefinite stamens
  • Syngenesious
  • Monadelphous stamens
  • Synandrous
Indefinite number of stamens are characteristic of the family
  • Musaceae
  • Apocynaceae
  • Malvaceae
  • Asteraceae
Elongated internode between corolla and androecium is
  • Anthophore
  • Gynophore
  • Gynandrophore
  • Androphore
Androecium of Papilionadae family is
  • Monadelphous
  • Diadelphous
  • Polyadelphous
  • None of the above
In which of the families the stamens are in two whorls and epiphyllous?
  • Malvaceae
  • Solanaceae
  • Liliaceae
  • Caesalpinioideae
Number of stamens present in malvaceae is
  • Infinite ($$\infty$$)
  • Five (5)
  • Ten (10)
  • Nine + one (9+1)
The technical term used for the androecium in a flower of China rose (Hibiscus rosa-sinensis) is
  • Polyadelphous
  • Monadelphous
  • Diadelphous
  • Polyandrous
Adhesion in a flower is
  • Union of dissimilar parts
  • Union of similar parts
  • Both (A) and (B)
  • None of the above
Which one is applicable to insect pollinated flowers?
  • Flowers are very small produced in large quantities.
  • Flowers are not prominent and without nectar.
  • Flowers are conspicuous and scented having nectar.
  • None of these
Anemophily is pollination by
  • Air
  • Water
  • Insects
  • Animal
Epipetalous stamen, obliquely placed placenta and fruit berry or capsule are diagnostic features of family
  • Cruciferae
  • Solanaceae
  • Malvaceae
  • Labiatae
Each pollen grain produces ______ male gametes.
  • Three
  • Two
  • Four
  • One
Tetradynamous stamens are found in
  • Brassica
  • Pisum
  • Hibiscus
  • Cucurbita
What is the function of germ pore?
  • Absorption of water for seed germination
  • Initiation of pollen tube
  • Release of male gametes
  • Emergence of radicle
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