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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
Chromosomal doubling is caused in callus by using:A. CytokinisB. Auxin: Cytokinins 1:1C. Auxin : Cytokinins 10:1D. Colchicine |
| Answer» Correct Answer - D | |
| 752. |
To get haploid callus, one can culture:A. EmbryoB. Leaf tissueC. StigmaD. Pollens |
| Answer» Correct Answer - D | |
| 753. |
Haploid callus can be converted to diploid callus using:A. Polyethylene glycolB. ColchicineC. CytokininsD. Auxins |
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Answer» Correct Answer - B Colchicine treatement is given to convent haploid callus into diploid callus. Colchicine is an artificial polyploidizing agent capable of causing chromosomal doubling. |
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| 754. |
Ovules are found attached at basal placentatioin in:A. AsteraceaeB. LiliaceaeC. CucurbitaceaeD. Malvaceae |
| Answer» Correct Answer - A | |
| 755. |
Agamospermy includes:A. AposporyB. ApogamyC. Adventile embryonyD. All of these |
| Answer» Correct Answer - D | |
| 756. |
Recurrent agamospermy is seen inA. bananaB. appleC. pearD. both 2 & 3 |
| Answer» Correct Answer - D | |
| 757. |
Fusion product of two parts and a male gamete refers to:A. Double fertilizationB. Triple fusionC. Primary endospermD. Secondary nucleus |
| Answer» Correct Answer - B | |
| 758. |
Male nucleus fuses with female nucleus during fertilization as:A. They posses two sets of different chargesB. They posses two sets of different genomeC. They are different in size and shapeD. Hormones compel them to fuse |
| Answer» Correct Answer - B | |
| 759. |
Formation of an embryo from synergid or any other haploid cell refers to:A. ParthenocarpyB. ParthenogenesisC. ApogamyD. Both b and c correct |
| Answer» Correct Answer - D | |
| 760. |
The structures which guide the pollen tube into synergid isA. antipodalsB. germ poreC. aprilD. filiform apparatus |
| Answer» Correct Answer - D | |
| 761. |
An ovule with mature embryo sac represents a sporophyte body containing?A. A gametophyte organB. Another sporophyteC. ArchesporiumD. Archegonium |
| Answer» Correct Answer - A | |
| 762. |
A polygonum type embryo sac is:A. 7 celled, 7-nucleateB. 7 celled, 8-nucleateC. 8 celled, 7-nucleateD. 8 celled, 8-nucleate |
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Answer» Correct Answer - B Polygnum type of embryo sac/typical female gametophyte of angiosperms is 7 celled, 8-nucleate. |
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| 763. |
The largest cell of the mature embryo sac isA. antipodal cellsB. synergidsC. central cellD. egg cell |
| Answer» Correct Answer - C | |
| 764. |
The only type of pollination which during pollination brings genetically different types of pollen grains to the stigma, is:A. XenogamyB. GeitonogamyC. ChasmogamyD. Autogamy |
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Answer» Correct Answer - A Type of pollination that brings genetically different types of pollen grains to the stigma of a plant is xenogamy. |
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| 765. |
The placenta is located inside the ___________ |
| Answer» Correct Answer - Ovarian cavity | |
| 766. |
The only type of pollination which during pollination brings genetically different types of pollen grains to the stigma, is:A. GeitonogamyB. XenongamyC. AutogamyD. Chasmogamy |
| Answer» Correct Answer - B | |
| 767. |
Read the following statements and find out the incorrect statements. a. The placenta is located inside the locule. Arising from the placenta are the ovules. b. The number of ovules in an ovary may be one (papaya, watermelon and orchids) to many (wheat, paddy and mango). c. Each ovule has one or two protective envelops called integuments. d. Integuments encircle the ovule except at the tip where a small opening called the chalaza is organised. Opposite the chalaza is the micropylar end. e. Enclosed within the integuments is a mass of cells called the perisperm.A. b,d and eB. a, c and dC. b,c and eD. a,b and d |
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Answer» Correct Answer - A `**` The number of ovules in an ovary may be many (papaya, watermelon and orchids) to one (wheat, paddy and mango). `**` Enclosed within the integuments is a mass of cells called the nucellus. `**` Each ovule has one or two protective envelopes called integuments. Ineguments encircle the ovule except at the tip where a small opening called the micropyle is organised. Opposite the micropylar end, is the chalaza, representing the basal part of the ovule. |
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| 768. |
Assertion : Wind pollination requires that the pollen grains are light and non-sticky. Reason : Light pollen grains can be transported easily in wind currents.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 reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If both assertion and reason are false. |
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Answer» Correct Answer - A Wind pollination also requires that the pollen grains are light and non-sticky so that they can be transported in wind currents. |
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| 769. |
Homozygous disploid can easily be produced using:A. Ovary cultureB. Tissue cultureC. Protoplast cultureD. Pollen culture |
| Answer» Correct Answer - D | |
| 770. |
Assertion : The distribution of bryophytes and pteridophytes is limited. Reason : In bryophytes and pteridophytes water is required for the transport of male gamete and fertilisation.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 reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If both assertion and reason are false. |
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Answer» Correct Answer - A `**` Pollinationo by water is quite rare in flowering plants and is limited to about 30 genera, mostly monocotyledons. `**` As against this, water is a regular mode of transport for the male gametes among the lower plant groups such as algae, bryophytes and lower plant groups such as algae, bryophytes and pteridophytes. `**` It is believed, particularly for some bryophytes and pteriodophytes, that their distributionis limited Because of the need for water for the transport of male gametes and fertilisation. |
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| 771. |
Hydorphily is limited to 30 genera which are mostlyA. gymnospermsB. monocotsC. dicotsD. more than one option is correct |
| Answer» Correct Answer - B | |
| 772. |
Plants of which one of the following groups of genera are pollinated by the same agency ?A. Triticum, Cocos, MangiferaB. Ficus, Kigelia, CasuarinaC. Salvia, Morus, EuphorbiaD. Bombax, Dutea, Bauhinia |
| Answer» Correct Answer - B | |
| 773. |
Which of the following will lose its economic value, if it fruits are produced by induced parthenocarpy?A. GrapeB. BananaC. OrangeD. Pomegranate |
| Answer» Correct Answer - D | |
| 774. |
Genotypically the pollen grain proudcedin side the anther belong toA. one typeB. two typesC. many typesD. all the above |
| Answer» Correct Answer - C | |
| 775. |
Pollen tablets are available in the market forA. Ex situ conservationB. In vitro fertilizationC. Breeding programmesD. Supplementing food |
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Answer» Correct Answer - D Pollen grains are rich in nutrients. It has become a fashion in recent years to use pollen tables as food supplements. |
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| 776. |
In protoplast culture, PEG is used as:A. Polyploidizing agentB. Artificial fusion agentC. HormoneD. Enzyme |
| Answer» Correct Answer - B | |
| 777. |
Fill in the blanks (i) Autogamy is obligatory in ___________floweres (ii) The shedding fo pollen grains occurs at _______________stage in 40% of angiosperms |
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Answer» (i) cleistogamous (ii) three celled |
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| 778. |
State True or False (i) Shedding of pollen grains takes place at three celled stage in 60% os angiosperms (ii) Pollen viablity period for rice is 30 minutes |
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Answer» (i) False (ii) Ture |
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| 779. |
Each pollen grain produces tow male gametes. How many pollen grains will be required to fertilise 4 ovules present in a particular carpel ? Give reasons in support of your answer. |
| Answer» Every pollen grain germinates to produce two male gametes. These are carried to the embryo sac through a pollen tube. The pollen tube enters into the embryosac through the filliform apparatus of one of the synergids and releases two male gametes. Out of two male gametes , one fuses with the egg and the other fuses with the secondary nucleus. Therefore, one pollen grain can fertilise only one ovule and four pollen grain will be required to fertilise four ovules. | |
| 780. |
What is the function of the two male gametes produced by each pollen grain in angiosperms. |
| Answer» One male gamete fuses with egg to form zygote and the other fuses with secondary nucleus to form primary endosperm nucleus. | |
| 781. |
At the time of shedding the number of nuclei present in an angiosperm pollen grain isA. oneB. one or twoC. two or threeD. only two |
| Answer» Correct Answer - C | |
| 782. |
Assertion. A pollen grain of angiosperm is considered as the male gametophyte . Reason. All the nuclei of the pollen grain produce male gametes.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 and but the Reason is false.D. If both Assertion and Reason are false. |
| Answer» Correct Answer - C | |
| 783. |
Which one of the following would not lead to formation of clones?A. double fertilisationB. apomixisC. Vegetative reproductionD. Tissue culture |
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Answer» Correct Answer - A Closne is an individual obtaind from single parent through apomixis, vegetative reproduction and tissue culture. The proces of fuson of two male gametes in a single embryo sac is called double fertilisation. It is found in sexual reproduction of angiosperms only and discovered by Nawashin (1898). |
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| 784. |
Clones are:A. Only morphologically alikeB. Only genetically alikeC. Morphologically as well as genetically alikeD. Ocassionally genetically alike |
| Answer» Correct Answer - C | |
| 785. |
In angiosperm, syngamy or true fertilization refers toA. fusion of a sperm with secondary nucleus of form zygoteB. fusion of sperm with oosphereC. fusion of one sperm with egg and other with secondary nucleusD. fusion of one of the sperm with a syergid |
| Answer» Correct Answer - B | |
| 786. |
Why is endosperm in angiosperm ovule considered as more efficient ? |
| Answer» In angisperm , the cells of endosperm are triploid due to double fertilization. Thefore , they are more efficient in supplying food material to the developing embryo. | |
| 787. |
Albuminous seeds store their reserve food mainly inA. perispermB. endosperm and cotyledonsC. cotyledonsD. hypocotyl |
| Answer» Correct Answer - B | |
| 788. |
The single cotyledon in monocots isA. scutellum which is laterial in positionB. aleurone layeer which is terminal in positionC. scutellum which is centrally placedD. epiblast which is halpid and lateral in position |
| Answer» Correct Answer - A | |
| 789. |
Endosperm is formed in angiosperms due to double fertilization. It is, however, absent in certain seeds due to lack ofA. Certain enzymesB. Growth hormoneC. Dicotyledonous hormoneD. Nutrients |
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Answer» Correct Answer - B Endosperm is formed in angiosperms due to double fertilization. It is, however, absent in certain seeds due to lack growth hormone. |
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| 790. |
Endosperm of angiosperm results from fertilization of:A. Egg cell with male gameteB. Poalar with male gameteC. Secondary nucleaus with male gameteD. |
| Answer» Correct Answer - C | |
| 791. |
Fill in the blanks (i) Double fertilzation involves ______________and _____________ (ii) The most commont type of endosperm in angiosperms is ____________ (iii) Perispermic seeds have persistent ______________ |
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Answer» (i)Suyngamy triple fusion (ii) uclear (iii)Nucellus |
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| 792. |
Assertion : In angiosperms, endosperm development precedes embryo development. Reason : Double fertilisation ensures that the nutritive tissue is formed before the zygotes starts cleaving so that the energy spent on the formation of endosperm does not get wasted.A. If both assertion and reason are true and reason is the correct explanation of assertionB. If both assertion and reason are true but reason is not the correct explanation of assertionC. If assertion is true but reason is falseD. If both assertion and reason are false |
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Answer» Correct Answer - a During double fertilisation in angiosperms, one male gamete fuses with the egg to form the diploid zygite (syngamy or generative fertilisation). The diploid zygote finally develops into embryo. The other male gamete fuses with the two polar nuclei (or secondary nucleus) to form the triploid primary endosperm nucleus, PEN (triple fusion or vegetative fertilisation). Double fertilisation ensures that the nutritive tissue is formed before the zygote starts cleaving so that the energy spent on the formation of endosperm does not go waste in case the fertilisation fails. Angiosperms are therefore, economical and more specialised as compared to gymnosperms where a large nutritive female gametophyte is formed long before fertilisation. |
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| 793. |
Exalbuminos seeds are ofA. wheat pea groundnutB. castor pea groundnutC. pea groundnut beansD. wheat castor rice |
| Answer» Correct Answer - C | |
| 794. |
Endosperm is formed during the double fertilization byA. t wo polar nuclei and one male gameteB. one polar nucleir and one male gamete ovum and male gameteC. ovum and male gameteD. two poplar nuclei and two male gametes |
| Answer» Correct Answer - A | |
| 795. |
Double fertilization isA. Syngamy and triple fusionB. Fusion of two male gametes with one eggC. Fusion of one male gamete with two polar nucleiD. Fusion of two male gametes of a pollen tube with two different eggs. |
| Answer» Correct Answer - A | |
| 796. |
Total number of nuclei involved in double fertilization isA. 2B. 3C. 4D. 5 |
| Answer» Correct Answer - D | |
| 797. |
Double endosperm is found inA. wheatB. riceC. peaD. coconut |
| Answer» Correct Answer - D | |
| 798. |
Double fertilization was first discovered by Nawaschin (1898) inA. lilium and alliumB. lilium and fritillariaC. zea mays and mangiferaD. nigella and fritillaria |
| Answer» Correct Answer - B | |
| 799. |
The role of double fertilization is to produce:A. cotyledonsB. endocarjpC. endospermD. integuments |
| Answer» Correct Answer - C | |
| 800. |
When a diploid female plant is crossed with a tetraploid male, the ploidy level of endosperm cells in the resulting seed is:A. tetrapolidyB. pentaploidyC. diploidyD. tripolidy |
| Answer» Correct Answer - A | |