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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.
| 601. |
What is apomixis and what is its importance ? |
| Answer» Apomixis is the mechanism of seed production without involving the process of meiosis and syngamy. It plays an important role in hybrid seed production. The method of producing hybrid seeds by cultivation is very expensive for farmers. Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis. Apomixis prevents the loss of specific characters in the hybrid. Also, it is a cost-effective method for producing seeds. | |
| 602. |
Explain the role of tapetum in the formation of pollen-grain wall . |
| Answer» Tapetum is the innermost layer of the microsporangium. It provides nourishment to the developing pollen grains. During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the development of pollen grains. It also produces the exine layer of the pollen grains, which is composed of the sporopollenin. | |
| 603. |
A typicxal dicotyledonous embryo consists ofA. Radicle onlyB. Embryonal axis and cotyledonsC. Cotyledons onlyD. Embryonal axis only |
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Answer» Correct Answer - B A typical dicotyledonous embryo consists of embryonal axis and cotyledons. |
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| 604. |
Function of filiform apparatus is toA. Recognize the suitable pollen at stigmaB. Stimulate division of generative cellC. Produce nectarD. Guide the entry of pollen tube |
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Answer» Correct Answer - D Filiform apparatus of synergids secrete some chemotropically active substances, which direct t he pollen tube towards micropyle of ovule. |
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| 605. |
Which one of the following statement is correct?A. Hard outer layer of pollen is called intineB. Sporogenous tissue is haploidC. Endothecium produces the microsporesD. Tapetum nourishes the developing pollen. |
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Answer» Correct Answer - D Tapetum is the innermost layer of microsporangium. It nourishes the pollen grains. The inner wall of pollen grains is called intine. Endothecium is the wall around the microsporangium, which provide protection and help in dehiscence of anther to release the pollen. Sporogenous tissue is diploid. It undergoes meiotic division to form microspore tetrads. |
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| 606. |
State one advantage and one disadvantage of cleistogamy. |
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Answer» Advantage : It ensures self pollination and ensures seed production . Disadvantage : Less chances of the production of new species and varieties. |
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| 607. |
Advantage of cleistogamy isA. more vigorous offspringB. no dependence on pollinatorsC. viviparyD. higher genetic variability |
| Answer» Correct Answer - B | |
| 608. |
Which thype of pollination is found in cleistogamy flower |
| Answer» Correct Answer - Self pollination | |
| 609. |
A tirsomic plant has 2n=24, the numberof chloromosomes in its endosperm will be:A. 18B. 37C. 20D. 17 |
| Answer» Correct Answer - B | |
| 610. |
Scutellum in monocot seed represents the:A. CotyledonsB. RadicleC. PlumuleD. Aril |
| Answer» Correct Answer - A | |
| 611. |
A: chalazal vacuole is present in the help cell of embryo sac R: Polarity of synegid cytoplasm is opposite to egg cellA. if both assetion A reason are ture and the reason is the correct explanation of the assertion then markB. if both assertion & reason are ture and the reason is not the correct explanation of the assertin then markC. if assertion is true statement but reason is false then markD. if both assertion and reason are flase statements then mark |
| Answer» Correct Answer - B | |
| 612. |
Germination is epigeal inA. Zea maysB. helianthusC. MangiferaD. Pisum. |
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Answer» Correct Answer - B Germination is epigeal in Helianthus (sunglower). |
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| 613. |
Monocot seed generally showsA. Epigeal germinationB. Hypogeal germinationC. Both A and BD. None of the above |
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Answer» Correct Answer - B Monocot seed generally shows hypogeal germination. |
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| 614. |
Entry of pollen tube through chalazal end isA. SyngamyB. PorogamyC. MesogamyD. Basigamy |
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Answer» Correct Answer - D Entry of pollen tube through chalazal end is basigamy. |
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| 615. |
In 82% of angiosperm families, ovule isA. AnatropousB. OrthotropousC. AmphitropousD. Circinotropous |
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Answer» Correct Answer - A In 82% of angiosperm families, ovule is anatropous. |
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| 616. |
When anthers and stigma mature at the same time it is calledA. allogamyB. dichogamyC. homogamyD. dicliny |
| Answer» Correct Answer - C | |
| 617. |
When the anthers mature earlier than the stigma of ones own flower, the condition is known asA. DiclinyB. HetrostylyC. ProtandryD. Protogyny |
| Answer» Correct Answer - C | |
| 618. |
Seeds of Triticum monococcum are:A. HaploidB. DiploidC. TriploidD. Hexaploid |
| Answer» Correct Answer - B | |
| 619. |
In Pea, Castor and Maize, the number of cotyledons are respectivelyA. One, two and twoB. Two, two and oneC. Two , one and twoD. One, two and one. |
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Answer» Correct Answer - B In Pea, Castor and Maize, the number of cotyledons are two, two and one respectively. |
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| 620. |
In seeds, testa is formed by dried:A. Outermost layer of nuclellusB. Outer integumentC. Third intergumentD. Pericarp |
| Answer» Correct Answer - B | |
| 621. |
Supari, which is used with betel is dried and stony.A. EndocarpB. cotyledonsC. EndospermsD. None of these |
| Answer» Correct Answer - C | |
| 622. |
Banana fruit are seedless because they:A. are triploidB. have plenty of auxinsC. reproduce asexuallyD. none of these |
| Answer» Correct Answer - A | |
| 623. |
In castor seedlings, the first leaf is its:A. OrchidsB. CerelasC. PulsesD. Lotus |
| Answer» Correct Answer - B | |
| 624. |
Maximum viability of seeds can be tested by:"A. OrchidsB. CerealsC. PulsesD. Both a) and b) |
| Answer» Correct Answer - D | |
| 625. |
The most common type of development of endosperm isA. cellulose and pectinB. helobialC. nuclearD. perispermic |
| Answer» Correct Answer - C | |
| 626. |
Coconut hasA. central liquid multinucleated endospermB. helobial endospermC. both (1) and (2)D. exalbuminous endosperm |
| Answer» Correct Answer - A | |
| 627. |
Why the ovules are abortive in seedless banana?A. The plant is grown by vegetative meansB. Flowers remain unpollinatedC. these are self sterilityD. Plant is triploid thus unable to produce fertile ovules. |
| Answer» Correct Answer - D | |
| 628. |
When only the first division is followed by cytokinesis, the development of endosperm is calledA. cellularB. nuclearC. ruminateD. helobial |
| Answer» Correct Answer - D | |
| 629. |
Albuminous seeds are produced in:A. Wheat, Maize, PaddyB. Sugarcane, Barley, RyeC. Castor, Coconut, PoppyD. All of these |
| Answer» Correct Answer - D | |
| 630. |
Non-albuminous seeds occur inA. MaizeB. WheatC. RiceD. Vallisneria |
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Answer» Correct Answer - D Non-albuminous seeds occur in Vallisneria. |
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| 631. |
Free nuclear division occurs inA. FlowerB. GametesC. EndospermD. Fruit |
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Answer» Correct Answer - C In the most common type of embryo development the PEN undergoes successive nuclear divisions to give rise to free nuclei. This stage of endosperm development is called free-nuclear endosperm. Subsequently cell wall formation occurs and the endsoperm becomes cellular. |
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| 632. |
Among the terms listed below, those that are not technically correct names for a floral whorl are (i) Andrecium (ii) Carpel (iii) Corolla (iv) Sepal,A. i and ivB. iii and ivC. ii and ivD. i and ii |
| Answer» Correct Answer - c | |
| 633. |
The hilum and micropyle lie side by side very close to each other inA. Anatropous ovulesB. Campylotropous ovulesC. Amphitropous ovuleD. Circinotropous ovules |
| Answer» Correct Answer - A | |
| 634. |
Mark the structure which facilitates entry of oxygen and water in to the seed during germinationA. sprophytic buddingB. apogamyC. aposporyD. diplospory |
| Answer» Correct Answer - C | |
| 635. |
Entry of pollen tube through micropyle isA. chalazogamyB. mesogamyC. porogamyD. pseudogamy |
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Answer» Correct Answer - C Porogamy refers to the most common method by which the pollen tube enters the ovule through micropyle, e.g. lily. When pollen tube enters through chalaza, it is known as chalazogamy and when it enters laterally through integuments, then such process is known as mesogamy. |
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| 636. |
Entry of pollen tube through micropyle is called :A. mesogamyB. porogamyC. chalazogamyD. none of these |
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Answer» Correct Answer - B The pollen tube containing male gametes enters the ovule is majority of cases through micropyle by a process termed as porogamy. |
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| 637. |
Micropyle of seed facilitates in the entry of:A. AirB. WaterC. PollensD. `CO_(2)` |
| Answer» Correct Answer - B | |
| 638. |
Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify. |
| Answer» Geitonogamous flowering plants are genetically autogamous as the gametes come from the same plant but since the pollen grains are being transferred to a different flower which needs a pollinating agent , it is functionally an example of cross pollination. | |
| 639. |
Prollen grains are well preserved as fossils because of the presence of:A. sporopolleninB. celluloseC. pectinD. carotenoids |
| Answer» Correct Answer - A | |
| 640. |
The hard outer layer of pollen grains called exine is made up of:A. CelluloseB. PectoseC. SporopolleninD. Chitin |
| Answer» Correct Answer - C | |
| 641. |
The hard outer layer of pollen grains called exine is made up of: |
| Answer» Correct Answer - Sporopollenin | |
| 642. |
Despite high level of heterozygosity, the progeny derived from a seed of cross pollinated plant was found to be completely uniform. One reason can beA. Induced mutationB. PolyploidyC. ApomixisD. Parthenocarpy |
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Answer» Correct Answer - C Depite high level of heterozygosity, the progeny derived from a seed of cross-pollinated plant was found to be completely uniform. One reason can be apomixis. |
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| 643. |
A: The gerative cell comes to lie freely in the cytoplasm of the tube cell R: Cellulosic wall around generative cell is dissovedA. if both assetion A reason are ture and the reason is the correct explanation of the assertion then markB. if both assertion & reason are ture and the reason is not the correct explanation of the assertin then markC. if assertion is true statement but reason is false then markD. if both assertion and reason are flase statements then mark |
| Answer» Correct Answer - C | |
| 644. |
Identify the pair of wrong statements I. Intine of pollen grains is made up of sporopollenin, II. Pollen grains are well preserved as fossils because of the presence of sporopollenin, III. Enzymes can degrade the organic material of the pollen grain exine, IV. Sporopollenin can withstand high temperature, strong acids and alkaliA. III, IVB. I, IIIC. I, IID. II, III |
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Answer» Correct Answer - B `**` Exine of pollen grains is made up of sporopollenin. `**` Enzymes do not degrade the organic material of the pollen grain exine. |
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| 645. |
a) List the three stages the annuals and biennial angiosperms have to pass through during their life cycle. b) List and describe any two vegetative propagules in flowering plants. |
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Answer» (a) Three stages (i) Vegetative phase (ii) Reproduction phase (iii) Senescene phase. (b) Root and Rhizomes |
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| 646. |
In angiosperms, female gametophte is called as embryo sac. Given figures represent different stages of embryo sac development in angiosperms. Arrange them in correct order and select the correct option. A. `(V) rarr (I) rarr (IV) rarr (II) rarr (III) rarr (VII) rarr (VI) rarr (VIII)`B. `(VIII) rarr (V) rarr (II) rarr (IV) rarr (III) rarr (VII) rarr (VI)rarr (I)`C. `(I) rarr (II) rarr (IV) rarr (V) rarr (VIII) rarr (III) rarr (VII) rarr (VI)`D. `(VIII) rarr (I) rarr (V) rarr (II) rarr (IV) rarr (III) rarr (VI) rarr (VII)` |
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Answer» Correct Answer - D The development of female gametophyte in angiosperms starts with differentiation of primary archesporial cell in the nucellus. In the hypodermal region of nucellus towards the micropylar end develops a primary archesporial cell which divides into outer primary parietal cell and inner primary sporgoenous cell (megaspore mother cell) which divides by meiosis to form a row of four hapliod magaspores adn the megaspore at the chalazal end remains functional which forms 8 nucleate embryo sac. The functional megaspore is the first cell of female gametophyte. The cell enlarges and undergoes three free nuclear mitotic divisions. The first division produces two nucleate embryo sac. The two nuclei shift to the two ends and divide there twice forming four nucleate and then eight nucleate structure. One nucleus from each side moves to the middle. They are called polar nuclei. The remaining three nuclei form cells at the two ends, 3 celled egg apparatus (two synergids and one egg cell) at the micropylar end and three antipodal cells at the chalazal end. The middle binucleate part organises itself into central cell. |
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| 647. |
Callase enzyme which dissolved callose of pollen tetrads to separate four pollends is provided byA. pollensB. tapetumC. middle layersD. endothecium |
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Answer» Correct Answer - B Tapetum secretes Ubisch bodies which get covered with sporopollenin and so increase thickness of exine of pollen grain wall. Tapetum provides nourishment to developing microspores. It also secretes callase enzyme which dissolves callose substances by which four pollens of a pollen tetrad are united, hence sparating microspores or pollens of a tetrad. |
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| 648. |
Read the given statements. (i) Outer exine is made up of sporopollenin. (ii) Inner intine is pecto-cellulosic in nature (iii) Generative cell is bigger and contains abundant food reserve (iv) Vegetative cell is small and floats in the cytoplasm of the generative cell. Which of the given statements are not true regarding structure of pollen grain?A. (i) and (ii)B. (ii) and (iii)C. (iii) and (iv)D. (i) and (iv) |
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Answer» Correct Answer - C In a mature pollen grain, the generative cell is smaller and the tube (or vegetative) cell is larger. In the later stages of development of pollen grain, callose dissolves and the naked generative cell comes to lie freely in the cytoplasm of the tube cell. The tube cell has a cytoplasm which is rich in the food reserve (starch, protein, fat with mostly unsaturated fatty acids). |
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| 649. |
In angiosperms various stages of reductional division can best be studied inA. young anthersB. mature antehrsC. young ovulesD. endosperm cells |
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Answer» Correct Answer - A Meiosis takes place in reproductive organs of plants and young anthers are the best material to study meiosis. |
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| 650. |
In dicots, at how many places exine is absent in the pollen grain ?A. 2B. 3C. 1D. more than 3 |
| Answer» Correct Answer - B | |