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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.
| 451. |
Fill in the blanks : A mature typical embryo sac contains…… cell and …. nuclei. |
| Answer» Correct Answer - seven, tow polar | |
| 452. |
Fill in the blanks : Flowers which do not open are called ……. |
| Answer» Correct Answer - Cleistogamous | |
| 453. |
Which one of the following is surrounded by a callose wallA. Microspore mother cellB. Male gameteC. EggD. Pollen grain |
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Answer» Correct Answer - A The wall of the pollen mother cell(microspore mother cell) is deposited by callose (`beta`-1, 3-glucan). |
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| 454. |
Endosperm is consumed by the developing embryo inA. CoconutB. PeaC. MaizeD. Castor |
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Answer» Correct Answer - B Endosperm is consumed by the developin embryo in pea/non-albuminous seeds. |
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| 455. |
Through which cell of the embryosac, does the pollen tube enter the embryosac ,A. Egg cellB. Persistant synergidC. Degenerated synergidD. Central Cell |
| Answer» Correct Answer - C | |
| 456. |
Eight nucleated embryosac isA. only monosporicB. only bisporicC. only tetrasproicD. any of these |
| Answer» Correct Answer - D | |
| 457. |
Polyembryony commonly occurs inA. PotatoB. CitrusC. TurmericD. Tomato |
| Answer» Correct Answer - B | |
| 458. |
Polyembryony commonly occurs inA. bananaB. tomatoC. potatoD. citrus |
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Answer» Correct Answer - D Polyembryony refers to the phenomenon of having more than one embryo in the same seed. In Citus, a seed has 2-40 embryos, one normal embryo and the rest adventitive embryos (mostly nucellar). In adventitive embryong, an embryo developsdirectly from a diploid cell other than egg like that of nucellus and integument, e.g., Citrus, Opuntia. |
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| 459. |
Polyembryony commonly occurs inA. tomatoB. potatoC. cirusD. turmeric |
| Answer» Correct Answer - C | |
| 460. |
Polyembryony was discovered in:A. CitrusB. PotatoC. DaturaD. Tobacco |
| Answer» Correct Answer - A | |
| 461. |
The process of fusion between male nucleus and egg nucleus is called asA. Triple fusionB. SyngamyC. Double fertilizationD. Apogamy |
| Answer» Correct Answer - B | |
| 462. |
Fusion of one of the male gametes with egg nucleus is referred to asA. generative fertilisationB. syngamyC. vegetative fertilisationD. both (a) and (b) |
| Answer» Correct Answer - D | |
| 463. |
The flower of brinjal is referred to as chaamogamoul while that of beanin cleistogamous. How are they different from each other ? |
| Answer» Flowers of brinjal are similar to flowers of other species where anthers and stigma are exposed. Such flowers are called chasmogamous. The flowers of beans, on the other hand, remain closed ot ensure self-pollination . Such flowers, which remain closed to that cross-pollination does not occur, are called cleistogamous. | |
| 464. |
A: In sporoderm pecitocellulosic layer is surrounded by sproropollenin R: Exine is differntiated into outer ektexine and inner endexineA. 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 | |
| 465. |
Emascualtion is only achieved by:A. Removal of stigmaB. Removal of sepals and petalsC. Removal of anthersD. Removal of gynoecium |
| Answer» Correct Answer - C | |
| 466. |
An advantage of clesitogamy isA. It leads to greater genetic diversityB. Seed dispersal is more efficient and wide spreadC. Each visit of polinator brings hundreds of pollen grainsD. Seed set is not dependent upon pollinators |
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Answer» Correct Answer - D An advantage of clesitogamy is seed set is not dependent upon pollinators. |
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| 467. |
Select the option which correctly identify the given plant. A. HelianthusB. CommelinaC. RosaD. Gossypium |
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Answer» Correct Answer - B Commelina produces two types of flowerchasmogamous flowers which are similar to flowers of other species with exposed anthers and stigma and cleistogamous flowers which do not open at all. In such flowers, the anthers and stigma lie close to each other. when anthers dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. Thus, cleistogamous flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma. Cleistogamous flowers assure seed-setting even in the absence of pollinators. |
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| 468. |
Double fertilization is a characteristic ofA. BryophytesB. PteriodophytesC. GymnospermsD. Angiosperms |
| Answer» Correct Answer - D | |
| 469. |
Select the correct statements (s) regarding the structure of a mature embryo sac. (i) Egg apparatus is situated towards chalzal end. (ii) Antipodal cells are situated towards micropylar end. (iii) A typical angiospermic embryo sac is 7-celled, 8-nucleate at maturityA. (i) onlyB. (ii) onlyC. (iii) onlyD. (i),(ii) and (iii) |
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Answer» Correct Answer - C In angiosperms, the female gametophyte (or embryo sac) is an oval multicellular haploid structures which is embedded in the nucellus towards micropylar half of the ovule. A typical and most common type of embryo sac, found in `80%` flowering plants is called Polygonum type of embryo sac. it contains 8 nuclei but 7 cells -3 micropylar, 3- chalazal and one central. it is formed by one meiosis and three mitosis. The three micropylar cells are collectively known as egg apparatus. The three chalazal cells of the embryo sac are called antipodal cells. |
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| 470. |
The filiform apparatus is present inA. synergidsB. egg cellC. antipodalsD. secondary nucleus |
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Answer» Correct Answer - A The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tube into the synergid. |
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| 471. |
Bisexual flowers which never open, demonstrateA. AutogamyB. AllogamyC. CleistogamyD. None of these |
| Answer» Correct Answer - C | |
| 472. |
Hydrophily occurs inA. NymphaeaB. NelumboC. EichhorniaD. Vallisneria / Zostera |
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Answer» Correct Answer - D Hydrophily occurs in Vallisneria/Zostera/hydrilla. |
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| 473. |
What is nucellus ? |
| Answer» It is the mass of parenchumatous tissue surrounded by integuments in an ovule. It enclose embryo sac and provides nourishment to the developing embryo. | |
| 474. |
Name any one bird-pollinated flower and mention one most important characteristic of such flower . |
| Answer» Example of bird-pollinated flower is Bombax ( Red silk cotton ), The most important character of bird-pollinated flowers is presence of brightly coloured funnel-shaped corolla. | |
| 475. |
Which of the following statements is not correct ?A. Pollen grains are released from anthers at 2-called stage.B. Sporogenous cell directly behaves as the magaspore mother cellC. Magaspore divides twice to form an eight nucleate embryo sac.D. Egg and synergids always lie near the micropylar end of ovule |
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Answer» Correct Answer - C The functional megaspore is the first cell of female gemetophyte. The cell enlarges and undergoes three free nuclear mitotic divisions. The first division produces two nucleate embryo sac. The two 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 at the micropylar end and three antipodal cells at the chalazal end. The middle binucleate part organises itself into central cell. Embryo sac developed from a single megaspore is caled monsporic. |
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| 476. |
Select the correct option regarding the ploidy level of different structures of an angiospermous ovule.A. `{:("Nucellus",MMC,"Functional megaspore"),(n,2n,2n):}`B. `{:("Nucellus",MMC,"Functional megaspore"),(2n,n,n):}`C. `{:("Nucellus",MMC,"Functional megaspore"),(2n,2n,n):}`D. `{:("Nucellus",MMC,"Functional megaspore"),(n,2n,n):}` |
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Answer» Correct Answer - C The body of the ovule consists of a mass of parenchymatous cells named nucellus. It is equivalent to magasporangium `(2n)`. Megaspore mother cell or megasporocyte is a diploid `(2n)` cell which undergoes meiosis to form a linear tetrad of four haploid megaspores `(n)`. Normally, the chalazal megaspore is the functional megaspores while the other three degenerate. |
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| 477. |
Hydrophily occurs inA. Nymphaea and NelumboB. Vallisneria and ZosteraC. Eichhornia and AristolochiaD. all of the |
| Answer» Correct Answer - B | |
| 478. |
What do you mean by hydrophily ? |
| Answer» A mode of pollination that occurs through water. | |
| 479. |
Flowers showing ornithophily show few characteristics likeA. blue flower with nectaries at base of corollaB. red sweet scented flower with nectariesC. bright red flower into thick inflorescenceD. white flowers with fragrance |
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Answer» Correct Answer - B Ornithophily is an allogamy performed by birds, such as long beaked small birds (sun birds, humming birds), crow, parrot, bulbul, etc. Ornithophilous flowers are large and showy cup-shaped with abundant nectar or edible part, e.g. Bombax, Agave, etc. |
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| 480. |
Assertion : Hydrophily constitues a major mode of pollination in most of the aquatic angiospermous plants. Reason : Almost all the aquatic dicot and monocot plants require water for the transport of male gametes and for fertilisation.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 - d Hydrophily is the made of pollination (transfer of pollen grains from the mature anther of a flower to the stigma of another flower) which is accomplished through the agency of water. Pollination by water is quite rare in flowering plants and is limited to only about 30 genera, mostly monocotyledons e.g. Vallisneria, Zostera, Ceratophyllum, etc. in may aquatic plants with emergent flowers, pollination occurs by wind or insects, e.g., lotus , water lily, water hyacinth, etc. |
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| 481. |
In case of polymbryone, an embryo A develops from the synergids and the embryo B develops from the nucellus. State the ploidy of embryo A and B. |
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Answer» Embryo A-Haploid (1N) Embryo B-Diploid (2N) |
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| 482. |
Write a note on the need and signifcance of pollination in plants. |
| Answer» Pollination is the tranfer of pollen grains from the opened anther of the stamen to the receptive stigma of the carpel. It is needed for the process of fertilization and production of seeds and fruits to ensure continuity of plant life. | |
| 483. |
What do you understand by ornithophily and chiropterophily ? |
| Answer» Pollination by birds ( such as humming birds, sun-birds, honey-eaters, etc. ) is called ornithophily and pollination by bats is called cheiropterophily. | |
| 484. |
Which of the following plant provide safe place to insect for laying eggs?A. sage plantB. amorphosphallusC. phyrsD. mango |
| Answer» Correct Answer - B | |
| 485. |
Production of seed without fertilization is calledA. parthenocarpyB. parthenogenesisC. apomixisD. apogamy |
| Answer» Correct Answer - C | |
| 486. |
In entomophily floweres areA. dull colouredB. nectrariesC. wih stickky pollen grainsD. small sized solitary |
| Answer» Correct Answer - C | |
| 487. |
Chasmogamous as well as cleistogamous both types of floweres are found inA. CommelinaB. Arachis hypogeaC. Mangifera indicaD. Zea mays |
| Answer» Correct Answer - Commelina | |
| 488. |
Ornithophily refers to the pollination by which or the following :A. InsectsB. BirdsC. SnailsD. Air |
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Answer» Correct Answer - B Allogamous pollination performed by birds is called ornithophily. Entomophily is pollination brought about through the agency of insects. |
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| 489. |
Male gametophyte of angiosperms/monocots isA. MicrosporangiumB. NucellusC. MicrosporeD. Stamen |
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Answer» Correct Answer - C Male gametophyte of angiosperms/monocots is microspore/pollen grain. |
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| 490. |
Exine in pollen grain in made up ofA. pectocelluloseB. lignocelluloseC. sporopolleninD. pollen kit |
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Answer» Correct Answer - C Exine is chiefly made upof sporopollenin. It discontinues or ruture ony by exine at some places (where sporopollenin absent). These placs are called pore, through which pollen tubes come out during germination on stigma. |
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| 491. |
Examples of water pollinated floweres areA. zostera lotus water lilyB. lotus vallisneria hydrillaC. ptoamogeton vallisneria lotusD. vallisneria hydreilla zostera |
| Answer» Correct Answer - D | |
| 492. |
Which of the following is pollinated by water?A. ViolaB. YuccaC. OxalisD. zostera |
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Answer» Correct Answer - D Pollination by water is called hydrophily. Plants, which occur below the water level are called sub-merged polants. When pollination occurs in these plants, it is called hypohydrophily, e.g. Zostera, Najas, etc. |
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| 493. |
Chromosome number in a flowering plant can beA. haploid, diploid and polyploidB. Haploid and diploidC. Only diploidD. Only haploid |
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Answer» Correct Answer - A Chromosome number in a flowering plant can be haploid, diploid and polyploid. |
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| 494. |
Which one of the following generates new genetic combinations leading to variations?A. Vegetative reproductionsB. ParthenogenesisC. Sexual reproductionD. Nucellar polyembryony |
| Answer» Correct Answer - C | |
| 495. |
Fore-runner of male gamete isA. megasporangiumB. embryo sacC. microspore mother cellD. antipodal cell |
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Answer» Correct Answer - C Microspores (pollen grains) are produced by meiosis in microspore mother cells. Microspore develops into male gametophyte. Male gametophyte forms two male gametes. So, forerunner of male gamete is microspore mother cell. |
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| 496. |
During sexual reproduction in angiosperm, the megaspore is produced byA. mitosisB. meiosisC. mitosis followed by meiosisD. meiosis followed by mitosis |
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Answer» Correct Answer - B In young ovules, a single hupodermal cell is differentiated as archesporium cells, which may or may not cut off some parietal cells and then becomes thenmegaspore mother cell. Megaspore mother cell undergoes meiosis to form four haploid megaspores arranged ina linear vertical row. |
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| 497. |
Assertion : Seeds generate new genetic combinations leading to variations. Reason : Seeds are the product of sexual reproduction.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 Being products of sexual reproduction, seeds generate new genetic combinations leading to variations. |
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| 498. |
Seeds are products of sexual reproduction because theyA. Give rise to new plantsB. Have variabilityC. Are formed by fusion of gametesD. Are formed by fusion of pollen tube |
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Answer» Correct Answer - C Seeds are products of sexual reproduction because they are formed by fusion of gametes/fertilisation. |
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| 499. |
Seeds are product of sexual reproduction as they are produced by:A. Fusion of gametesB. SiphonogamyC. OvulesD. Embroy sac |
| Answer» Correct Answer - A | |
| 500. |
Pollen tube when enter throgh integument, it refers to:A. MesogamyB. PorogamyC. ChalazogamyD. Pseudogamy |
| Answer» Correct Answer - A | |