CBSE Questions for Class 12 Medical Biology Sexual Reproduction In Flowering Plants Quiz 10 - MCQExams.com

Which of the following statements about sporopollenin is wrong?
  • Intine is formed of sporopollenin
  • Sporopollenin is not degraded by any known enzyme
  • Sporopollenin is most resistant organic material
  • Sporopollenin can withstand high temperature and strong acids
Which plant product is the hardest?
  • Suberin
  • Lignin
  • Sporopollenin
  • Cutin
Pollen grains have spiny exine to aid in
  • Entomophily
  • Anemophily
  • Ornithophily
  • Cheiropterophily
Endosperm is completely consumed by the developing embryo in
  • Pea, Bean and Groundnut
  • Maize, Bean and Castor
  • Maize, Pea and Groundnut
  • Maize, Bean and Pea
Sporopollenin is formed by the polymerization of
  • Fat and phenols
  • Fats and esters
  • Carotenoids and fat
  • Carotenoid and esters
Perisperm differs from endosperm in.
  • Its formation by fusion of secondary nucleus with several sperms
  • Being a haploid tissue
  • Having no reserve food
  • Being a diploid tissue
Which of the following finds application in hybrid seed industry?
  • Apomixis
  • Parthenocarpy
  • Parthenogenesis
  • Polyembryony
Pollen grains of rice and wheat lose their viability in _________ minutes of their release.
  • $$30$$
  • $$10$$
  • $$60$$
  • $$90$$
Male gametophyte in angiosperms produces
  • Two sperms and a vegetative cell
  • Single sperm and a vegetative cell
  • Single sperm and two vegetative cells
  • Three sperms
Entomophilous flowers are related to
  • Honey bees
  • Wind
  • Water
  • Hairy Mammals
Which is correct?
  • Sporopollenin is made up of inorganic materials.
  • Sporopollenin can withstand high temperature as well as strong acids and alkalies.
  • Sporopollenin can withstand high temperatures but not strong acids.
  • Sporopollenin can be degraded by enzymes.
Animal vectors are required for pollination in
  • Mulberry
  • Cucumber
  • Maize
  • Vallisneria
Germ pores in the pollen grains are regions.
  • That can withstand high temperature, strong acids and alkalies
  • Through which sperms are released into the female gametophyte
  • Which are made of lignin and suberin
  • Which lack sporopollenin
Wind pollinated plants generally do not show the character.
  • Feathery stigmas
  • Single ovule in the ovary
  • Well exposed stamens
  • Flowers are large and colourful
In Malvaceae, a single pollen grain produces ______ pollen tube.
  • $$1$$
  • $$2$$
  • $$4-6$$
  • $$10-14$$
Which one of the following statements is not true?
  • Stored pollen in liquid nitrogen can be used in the crop breeding programme.
  • Tapetum helps in dehiscence of anthers.
  • Exine of pollen grains is made of sporopollenin.
  • Pollen grains of many species cause severe allergies.
Discontinuous layers in the wall of pollen grain are
  • Absent
  • Foot layer
  • Baculate layer
  • Baculate layer and tectum
Pollen tube is covered by ___________.
  • Exine only
  • Plasmalemma only
  • Intine only
  • Exine and intine
Choose the correct options for statements P, Q, R in relevance to grass.

Statement P: Flowers possess attractive color and fragrance.
Statement Q: Pollen grains are small, dry and light in weight.
Statement R: Grass is air pollinated plant.
  • Both P and Q are true, R is correct explanation of Q
  • P is true and Q is false, R is correct explanation of P
  • P is false and Q is true, R is correct explanation of Q
  • Both P and Q are false, R has no relation with P and Q
Mulberry is pollinated by
  • Wind
  • Water
  • Insects
  • Birds
Butterflies pollinate
  • Bluish flowers
  • Violet flowers
  • Reddish flowers
  • Purple flowers
Embryo without plumule, radicle and cotyledon is formed in
  • Orchids
  • Orobanche
  • Utricularia
  • All the above
Diplospory leads to
  • Adventive embryony
  • Recurrent agamospermy
  • Nonrecurrent agamospermy
  • Parthenogamy
Consider the following statements with respect to pollen grains.
(a) Exine is thin, continuous layer made up of cellulose and pectin
(b) Hard outer layer called exine is made of sporopollenin
(c) Sporopollenin is present in germ pores
(d) Exine exhibits a fascinating array of patterns and designs. Of the statements.
  • a and b alone are correct
  • a and c alone are correct
  • b and d alone are correct
  • b and c alone are correct
Which is not true about emasculation of a flower while performing an artificial cross ________________.
  • It is removal of anthers from flower
  • It is done before anthesis
  • It is to avoid self pollination
  • It is done in flowers of plants selected as male parent.
Removal of anthers of some flowers during plant breeding is
  • Anthesis
  • Emasculation
  • Pollination
  • For collection of pollen
The process of removing stamens from floral buds during hybridisation experiments is
  • Capping
  • Selfing
  • Emasculation
  • Crossing
Emasculation is related to
  • Pure line
  • Mass selection
  • Clonal selection
  • Hybridisation
The smallest pollen grain occurs in
  • Myosotis
  • Mirabilis
  • Zostera
  • Eucalyptus
Emasculation ensures cross pollination in _______________.
  • Staminate flower
  • Bisexual flower
  • Neuter flower
  • Pistillate flower.
Polyembryony was first reported by
  • Leeuwenhoek
  • Strasburger
  • Hofmeister
  • Hanstein
Emasculation of flowers is carried out through removal of
  • Stigma
  • Sepals and petals
  • Anthers
  • Entire organism
Go through the following statements regarding a substance which enable pollen grain to tolerate in extremely adverse condition and choose correct option.
I. It form the exine of pollen grain.
II. It is one of the resistant organic material.
III.It contain a aperture called germ pore where it is present.
IV. It can withstand high temperatures and strong acids.
V. Still new no enzyme has been discovered which can degrade it.
  • All statements are correct and belong to sporopollenin.
  • All statements are correct and belong to lignin.
  • Statements I, II, Ill and IV are correct and belong to sporopollenin.
  • Statements I, II, IV and are correct and belong to sporopollenin.
Emasculation is part of
  • Hybridisation
  • Pure line selection
  • Mass selection
  • Clonal selection
The pollen-pistil rejection reaction in a plant showing ametophytic selfincompatibilty usually occurs _______________.
  • On the stigma
  • In the style
  • In the ovary before entering the embryo sac
  • During game tic fusion
Which one is absent in windy areas
  • Birds
  • Anemophilous plants
  • Zoophilous plants
  • Insects
Find the correct match
III
(a)Use of bisexual flowers as female flowersi.Clonal selection
(b)Incorporation of several desirable characters into a single varietyii.Pure line selection
(c)Exploiting hybrid vigour for several generationsiii.Emasculation
(d)Improving local varieties of self pollinated plantsiv.Hybridisation
v.Polyploidy breeding
  • a-iv, b-v, c-iii, d-i
  • a-ii, b-iii, c-iv, d-v
  • a-iii, b-iv, c-i, d-ii
  • a-i, b-v, c-ii, d-iv
Which one of the following is the correct sequence of procedures for site specific somatic hybridization in plants?
  • Procuring haploid cells from the parental species-isolation of protoplasts by removing the cellulose wall-protoplast fusion-regeneration of the fused cell
  • Isolation of somatic cells-extraction of protoplasts-protoplast fusion - culturing of the fused cell
  • Isolation of haploid and somatic cells extraction of their protoplasts regeneration-fusion of cells
  • Enzymatic isolation of haploid cells- isolation of protoplasts fusion of extracted protoplasts-regeneration of the fused cell
When the pollen of one flower pollinates another flower on the same plant, it is called ____________.
  • Autogamy
  • Geitonogamy
  • Allogamy
  • Xenogamy
Emasculation of female plant having bisexual flowers is carried out in hybridisation program with the help of forceps by removing
  • Style before dehiscence of anthers
  • Style after dehiscence of anthers
  • Anthers before their dehiscence
  • Anthers after their dehiscence
Consider the following statements:
The seed of pea is albuminous.
The fruit of peach is drupe.
Which of the statements given above is/are correct?
  • 1 only
  • 2 only
  • Both 1 and 2
  • Neither 1 nor 2
The polyembryony commonly occurs in.
  • Tomato
  • Potato
  • Citrus
  • Turmeric
The envelope of the embryonic shoot in maize seed is called _____________.
  • Testa
  • Tegmen
  • Scutellum
  • Coleoptile
Pollinia occur in.
  • Orchidaceae
  • Onagraceae
  • Orobanchaceae
  • Oxalidaceae
Formation of propagules on floral branches, either in to the flowers or in the place of them, is called _________________.
  • Adventive embryony
  • Generative apospory
  • Somatic apospory
  • Vegetative vivipary
Ipomea batatas is propagated vegetatively by using __________.
  • Bulbs
  • Corns
  • Tubers
  • Vine cuttings
Consider the following fruit crops.
a. Musa
b. Malus
c. Citrus
d. Mangifera
In which of the nuclear polyembryony is known to occur commonly?
  • $$1, 2$$ and $$3$$
  • $$3$$ only
  • $$3$$ and $$4$$
  • $$1, 2$$ and $$4$$
A plant with four heterogonous pairs of chromosomes having Aa, Bb, Cc, Dd is self fertilized, the resulting genotype with Aa Bb Cc Dd genes occur according to which one of the following frequencies?
  • $$1/16$$
  • $$1/64$$
  • $$1/256$$
  • $$1/1024$$
In Oak tree, the pollination is brought about by.
  • Bats
  • Insects
  • Squirrels
  • Wind
The pollination between two flowers on different plants is known as ____________.
  • Xenogamy
  • Getionogamy
  • Cleistogamy
  • Dichogamy
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