12th Class Biology Sexual Reproduction in Flowering Plant / फूलों के पौधों में यौन प्रजनन Question Bank

done Case Based - Sexual Reproduction in Flowering Plants Total Questions - 65

• question_answer1)

  Directions : (1-5)

  Read the passage given below and answer the following questions.

  Flower has two parts of a typical stamen - the long and slender stalk called the sterile filament, and the terminal generally bilobed structure called the fertile anther. The proximal end of the filament is attached to the thalamus or the petal or perianth of the flower. Two anther lobes are separated in the anterior region by a deep groove however, attached to each other on eh back side by sterile parenchymatous tissue i.e., connective tissue has vascular strand i.e., xylem and phloem. The number and length of stamens are variable in flowers different species i.e., heterostamens.

  Collect a stamen each from ten flowers of different species and arrange them on a slide. There are large variation in size seen in nature. Careful observation of each stamen under a dissecting microscope and making neat diagrams would elucidate the range in shape and attachment of anthers in different flowers. A typical angiosperm anther is bilobed with each lobe having two theca, i.e., they are dithecous. Often a longitudinal groove runs lengthwise separating the theca.

  Nature of filament of stamen is -
  A)
  Fertile in nature done clear
  B)
  Sterile in nature done clear
  C)
  Infertile in nature done clear
  D)
  Liable to change done clear
  View Solution play_arrow

• question_answer2)
  The proximal end of the filament of flower is attached to -
  A)
  Sepal done clear
  B)
  Gynoecium done clear
  C)
  Leaf done clear
  D)
  Thalamus done clear
  View Solution play_arrow

• question_answer3)
  Which structure of the anther has vascular strand i.e., xylem and phloem?
  A)
  Filament only done clear
  B)
  Connective tissue only done clear
  C)
  Both of these done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer4)
  Connective tissue of the anther is made up of which type of cell.
  A)
  Squamous type done clear
  B)
  Collenchymatous type done clear
  C)
  Sclernchymatous type done clear
  D)
  Parenchymatous type done clear
  View Solution play_arrow

• question_answer5)
  A typical anther of angiosperm is
  A)
  Monolobed done clear
  B)
  Bilobed done clear
  C)
  Trilobed done clear
  D)
  Tetralobed done clear
  View Solution play_arrow

• question_answer6)

  Directions : (6-10)

  Read the passage given below and answer the following questions.

  Tapetum is the inner most nourishing layer of microsporangial wall. The cells have dense cytoplasm. They become large, multinucleated and polyploidy through endomitosis and endopolyploidy. It provides nourishment to growing pollen grains. Tapetum provides enzyme callase for dissolution of callose binding the microspores. It secretes hormones (e.g., IAA) that are stored in pollen grains for their early growth. Tapetum secretes lipid rich Ubischgranules which provide sporopollenin and other materials for exine part of pollen grain covering. It provides pollenkitt (oily, sticky lipid covering and carotenoids) covering around the entomophilous pollen grains. Tapetum provides compatibility-incompatibility proteins to pollen grains.

  Cells of tapetum is
  A)
  Uninucleated and haploid done clear
  B)
  Uninucleated and diploid done clear
  C)
  Multinucleated and diploid done clear
  D)
  Multinucleated and polyploidy done clear
  View Solution play_arrow

• question_answer7)
  Which type of enzyme and hormone are released by the cells of tapetum?
  A)
  Callase and Gibberlin done clear
  B)
  Callase and Cytokinin done clear
  C)
  Callase and IAA done clear
  D)
  Lipase and IAA done clear
  View Solution play_arrow

• question_answer8)
  Nature of which granule is
  A)
  Proteineous in nature done clear
  B)
  Lipid in nature done clear
  C)
  DNA in nature done clear
  D)
  RNA in nature done clear
  View Solution play_arrow

• question_answer9)
  Tapetum is
  A)
  Outer protective layer done clear
  B)
  Middle protective layer done clear
  C)
  Inner protective layer done clear
  D)
  Inner nourishing layer done clear
  View Solution play_arrow

• question_answer10)
  Multinucleated nature of tapetum is due to
  A)
  Exomitosis and endopolyploidy done clear
  B)
  Endomitosis and endopolyploidy done clear
  C)
  Endomitosis and exopolyploidy done clear
  D)
  Only cytokinesis takes place done clear
  View Solution play_arrow

• question_answer11)

  Directions : (11-15)

  Read the passage given below and answer the following questions.

  As the anther develops, the cells of the sporogenoustissue undergo meiotic cell divisions to form microspore tetrads due to callose. As each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad. Each one is a potential pollen or microspore mother cell (PMC; 2n) or microsporocytes or archesporial cells. The process of formation of microspores from a pollen mother cell through meiosis is called microsporogenesis. The microspoores or pollen grains (n), as they are formed, are arranged in a cluster of four cells- the microsporetetrad i.e.. tetrahederal doe to callose. As the anthers mature and dehydrate, the microspores dissociate from each other due to callase and develop into pollen grains (n). Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence or bursting of anther.

  Cells of the sporogeneous tissue undergo which type of cell division
  A)
  Amitosis and mitosis done clear
  B)
  Amitosis and meiosis done clear
  C)
  Mitosis and meiosis done clear
  D)
  Meiosis only done clear
  View Solution play_arrow

• question_answer12)
  What is the ploidy level of the pollen mother cell (PMC)?
  A)
  Haploid only (n) done clear
  B)
  Diploid only (2n) done clear
  C)
  Triploid only (3n) done clear
  D)
  Tetraploid only (4n) done clear
  View Solution play_arrow

• question_answer13)
  How many cells are present in microspore tetrad
  A)
  One only done clear
  B)
  Two only done clear
  C)
  Three only done clear
  D)
  Four only done clear
  View Solution play_arrow

• question_answer14)
  What is the nature of callose -
  A)
  Lipid done clear
  B)
  Protein done clear
  C)
  Carbohydrates done clear
  D)
  Nucleic acid done clear
  View Solution play_arrow

• question_answer15)

  Assertion: Callase is helpful in the dissociation of four microspores.

  Reason: All the microspores are haploid in nature.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
  View Solution play_arrow

• question_answer16)

  Directions : (16 - 20)

  Read the passage given below and answer the following questions.

  The typical ovule is a small structure attached to the parenchymatous cushion placenta by means of a stalk called funicle. The body of the ovule fuses with funicle in the region called hilum. Funicle has vascular strand for the supply of nourishment to the ovule. Thus, hilum represents the junction between ovule and funicle. Each ovule has one or two protective envelopes called integuments. Integuments 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. Enclosed within the integuments is a mass of parenchymatou cells called the nucellus. Cells of the nucellus have abundant reserve food materials. Inside the nucellus is the development of embryo sac or female gametophyte. An ovule generally has a single embryo sac formed from a megaspore.

  Placenta of ovule is composed of which type of cell.
  A)
  Collenchymatous done clear
  B)
  Sclerenchymatous done clear
  C)
  Parenchymatous done clear
  D)
  Cuboidal or columnar done clear
  View Solution play_arrow

• question_answer17)
  The body of ovule fuses with the funicle in the region is called -
  A)
  Micropyle done clear
  B)
  Chalaza done clear
  C)
  Integument done clear
  D)
  Hilum done clear
  View Solution play_arrow

• question_answer18)
  The hilum represents the junction between
  A)
  Ovule and placenta done clear
  B)
  Ovule and funicle done clear
  C)
  Ovule and ovary done clear
  D)
  Ovule and locule done clear
  View Solution play_arrow

• question_answer19)
  Integuments encircle the ovule except at the tip, where a small opening is present named as
  A)
  Germ pore done clear
  B)
  Germ furrow done clear
  C)
  Micropyle done clear
  D)
  Nucellus done clear
  View Solution play_arrow

• question_answer20)

  Assertion: Ovule has mass of parenchymatous cells called nucellus.

  Reason: Cells of the nucellus have lot of reserve food materials.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
  View Solution play_arrow

• question_answer21)

  Directions : (21-25)

  Read the passage given below and answer the following questions.

  The fusion of male and female gamete is called fertilization. In angiosperm, the male gametes are brought to the egg containing embryo sac by a pollen tube (Strasburger, 1884). The phenomenon is called siphonogamy.

  After entering one of the synergids, the pollen tube releases the two haploid non motile male gametes into the cytoplasm of the synergid. Generative or Syngamy or True fertilisation : One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy. This results in the formation of a diploid cell, the zygote or oospore it further develops into an embryo. Vegetative or False fertilization: The other male gamete moves towards the two haploid polar nuclei or diploid secondary nucleus located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN). As this involves the fusion of three haploid nuclei it is termed triple fusion. The central cell after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm (3n). Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilisation, an event unique to flowering plants. It was discovered by Nawaschin, 1898 in Fritillaria and Lilium.

  The fusion between male and female gamete is called as
  A)
  Parethenocarpy done clear
  B)
  Parthenogenesis done clear
  C)
  Fertilisation done clear
  D)
  Somatic cloning done clear
  View Solution play_arrow

• question_answer22)
  In angiosperm, the male gametes are brought to the egg containing embryo sac by -
  A)
  Flagella done clear
  B)
  Cilia done clear
  C)
  Pseudopodia done clear
  D)
  Pollen tube done clear
  View Solution play_arrow

• question_answer23)
  Nature of male and female gametes are
  A)
  Male is motile and female is non motile done clear
  B)
  Male is non motile and female is motile done clear
  C)
  Both are motile in nature done clear
  D)
  Both are non motile in nature done clear
  View Solution play_arrow

• question_answer24)
  False fertilisation in flowering plants involves
  A)
  One male gamete and one synergid done clear
  B)
  One male gamete and one antipodal done clear
  C)
  One male gamete and one central cell done clear
  D)
  One male gamete and one egg cell done clear
  View Solution play_arrow

• question_answer25)
  Ploidy level of the primary endosperm nucleus is
  A)
  Haploid only (n) done clear
  B)
  Diploid only (2n) done clear
  C)
  Triploid only (3n) done clear
  D)
  Tetraploid only (4n) done clear
  View Solution play_arrow

• question_answer26)

  Directions : (26-30)

  Read the passage given below and answer the following questions.

  Flower has two parts of a typical stamen such as the long and slender stalk called the sterile filament, and the terminal generally bilobed structure called the fertile anther. The proximal end of the filament is attached to the thalamus or the petal or tepal of the flower. Two anther lobes are separated in the anterior region by a deep groove however, attached to each other on the back side by sterile parenchymatous tissue i.e., connective tissue has vascular strand i.e., xylem and phloem. The number and length of stamens are variable in flowers of different species i.e., heterostamens. A typical angiosperm anther is bilobed with each lobe having two thecae. Often a longitudinal groove runs lengthwise separating the theca.

  Nature of the filament of stamen is-
  A)
  It is fertile in nature. done clear
  B)
  It is sterile in nature. done clear
  C)
  Young is sterile but on maturity become fertile in nature. done clear
  D)
  Young is fertile but on maturity become sterile in nature. done clear
  View Solution play_arrow

• question_answer27)
  What is the ploidy level of fertile anther in a typical stamen?
  A)
  Haploid in nature (n) done clear
  B)
  Diploid in nature (2n). done clear
  C)
  Triploid in nature (3n) done clear
  D)
  Tetraploid in nature (4n). done clear
  View Solution play_arrow

• question_answer28)
  Connective tissue in the stamen is of
  A)
  Sclerenchymaious tissue. done clear
  B)
  Collenchymatous tissue. done clear
  C)
  Parenchymatous tissue. done clear
  D)
  Epithelial tissue. done clear
  View Solution play_arrow

• question_answer29)
  Epipetalous state of stamen is observed in-
  A)
  Members of family Liliaceae. done clear
  B)
  Members of family Fabaceae. done clear
  C)
  Members of family Solanaceae. done clear
  D)
  Members of family Brassicaceae. done clear
  View Solution play_arrow

• question_answer30)
  Tepal is the unique features of -
  A)
  Members of family Liliaceae. done clear
  B)
  Members of family Fabaceae. done clear
  C)
  Members of family Solanaceae. done clear
  D)
  Members of family Brassicaceae. done clear
  View Solution play_arrow

• question_answer31)

  Directions : (31-35)

  Read the passage given below and answer the following questions.

  As the anther develops, the cells of the sporogenous tissue undergo meiotic cell divisions to form microspore tetrads due to callose. As each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad. Each one is a potential pollen or microspore mother cell. The process of formation of microspores from a pollen mother cell through meiosis is called microsporogenesis. The microspores or pollen grains (n), as they are formed, are arranged in a cluster of four cells- the microsporetetrad i.e., tetrahedral due to callose. As the anthers mature and dehydrate, the microspores dissociate from each other due to callase and develop into pollen grains (n). Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the bursting of anther.

  What is the ploidy level of sporogeneous tissue?
  A)
  n done clear
  B)
  2n done clear
  C)
  3n done clear
  D)
  4n done clear
  View Solution play_arrow

• question_answer32)
  Which carbohydrate 'is responsible for the formation of microspore tetrad?
  A)
  Glucose done clear
  B)
  Sucrose done clear
  C)
  Callose done clear
  D)
  Ribose done clear
  View Solution play_arrow

• question_answer33)
  Which of the following enzyme is responsible to dissolve the callose of microspore tetrad?
  A)
  It is a amylase. done clear
  B)
  It is lipase. done clear
  C)
  It is cellulase. done clear
  D)
  It is callase. done clear
  View Solution play_arrow

• question_answer34)
  Ploidy level of the microspore mother cell is -
  A)
  Always haploid (n). done clear
  B)
  Always diploid (2n). done clear
  C)
  Always triploid (3n). done clear
  D)
  Always polyploidy (4n). done clear
  View Solution play_arrow

• question_answer35)
  Callase enzyme is secreted by which of the following layer of pollen sac.
  A)
  Epidermis of pollen sac. done clear
  B)
  Endothecium of pollen sac. done clear
  C)
  Middle layer of pollen sac. done clear
  D)
  Tapetum of pollen sac. done clear
  View Solution play_arrow

• question_answer36)

  Directions : 36 - 40

  Read the passage given below and answer the following questions.

  Pollination by water is quite rare in flowering plants and is limited to about 30 genera, mostly monocotyledons. Water is a regular mode of transport for the male gametes among the lower plant groups such as algae, bryophytes and pteridophytes. It is believed, particularly for some bryophytes and pteridophytes, that their retribution is limited because of the need for water for the transport of male gametes and fertilisation. Some examples of water pollinated plants are Vallisneria, Ceratophylum and Hydrilla which grow in fresh water and several marine Sea-grasses such as Zostera. Not all aquatic plants use water for pollination. In a majority of aquatic plants such as lotus, water hyacinth and water lily, the flowers emerge above the level of water and are pollinated by insects or wind as in most of the land plants.

  How many genera of angiosperm get pollinated by water?
  A)
  80 genera. done clear
  B)
  60 genera. done clear
  C)
  30 genera. done clear
  D)
  40 genera. done clear
  View Solution play_arrow

• question_answer37)
  Nature of antherozoid of bryophyta is
  A)
  Non motile and flagellated. done clear
  B)
  Motile and Non flagellated. done clear
  C)
  Non motile and Non flagellated. done clear
  D)
  Motile arid flagellated. done clear
  View Solution play_arrow

• question_answer38)
  Aquatic plants like lotus and waterlily are pollinated by
  A)
  Water only. done clear
  B)
  Water and air only. done clear
  C)
  Water and insects only. done clear
  D)
  Insect or wind. done clear
  View Solution play_arrow

• question_answer39)
  Which of the following marine angiosperm show hydrophily?
  A)
  Vallisneria done clear
  B)
  Ceratophylum done clear
  C)
  Hydrilla done clear
  D)
  Zostera done clear
  View Solution play_arrow

• question_answer40)

  Assertion: Pteridophytes are pollinated by wind.

  Reason: Bryophytes are pollinated by honey bee.

  A)
  Assertion and reason both are correct statements and reason is correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
  View Solution play_arrow

• question_answer41)

  Directions : (41 - 45)

  Read the passage given below and answer the following questions.

  The cells of the sporogenous tissue undergo meiotic cell divisions to form microspore tetrads due to callose. As each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad. Each one is a potential microspore mother cell. The process of formation of microspores from a pollen mother cell through meiosis is called microsporogenesis. The pollen grains (n), as they are formed, are arranged in a cluster of four cells- the microspore tetrad i.e., tetrahedral due to callose. As the anthers mature and dehydrate, the microspores dissociate from each other due to callase and develop into pollen grains (n).

  Study of pollen grains of following plant is
  A)
  Palynology done clear
  B)
  Palaeontology done clear
  C)
  Palaeobotany done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer42)
  Fore-runner of male gamete is
  A)
  Megasporangium done clear
  B)
  Antipodal cell done clear
  C)
  Microspore mother cell done clear
  D)
  Embryo sac done clear
  View Solution play_arrow

• question_answer43)
  Meiosis is best observed in
  A)
  Gamete done clear
  B)
  Microsporangium done clear
  C)
  Pollen grain done clear
  D)
  Anther wall done clear
  View Solution play_arrow

• question_answer44)
  An anther having four microsporocytes shall produce how many pollen grains
  A)
  24 done clear
  B)
  12 done clear
  C)
  8 done clear
  D)
  16 done clear
  View Solution play_arrow

• question_answer45)
  In young anther, four rows of cells destined to form pollen are collectively called
  A)
  Antheridium done clear
  B)
  Archesporium done clear
  C)
  Tapetum done clear
  D)
  Zoosporangium done clear
  View Solution play_arrow

• question_answer46)

  Directions 46 - 50

  Read the passage given below and answer the following questions.

  The typical ovule is attached to the paren chymatous cushion placenta by means of funicle. The body of the ovule fuses with funicle in the region called hilum Funicle has vascular strand for the supply of nourishment to the ovule. Thus, hilum represents the junction between ovule and funicle. Each ovule has one or two protective envelopes called integuments. Integuments 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 ovule. Enclosed within the integuments is a mass of parenchymatous cells called the nucellus. Cells of the nucellus have abundant reserve food materials. Inside the nucellus is the development of embryo sac or female gametophyte. An ovule generally has a single embryo sac formed from a megaspore.

  In flowering plants archesporium gives rise to :
  A)
  Wall of sporangium done clear
  B)
  Both wall and sporogenous cells done clear
  C)
  Tapetum and sporogenous cells done clear
  D)
  Wall and taperum done clear
  View Solution play_arrow

• question_answer47)
  Integument of ovule gets transformed into :
  A)
  Seed done clear
  B)
  Seed coat done clear
  C)
  Fruit wall done clear
  D)
  Cotyledons done clear
  View Solution play_arrow

• question_answer48)
  In 82% of angiosperm families nature ovule is :
  A)
  Anatropous done clear
  B)
  Orthotropous done clear
  C)
  Amphitropous done clear
  D)
  Circinotropous done clear
  View Solution play_arrow

• question_answer49)
  Match the following ovular structure with post fertilization structure and select the correct alternative :

  [A]	Ovule	1.	Endosperm
  [B]	Funiculus	2.	Aril
  [C]	Nucellus	3.	Seed
  [D]	Polar nuclei	4.	Perisperm

  A)
  2, 3, 4, 1 done clear
  B)
  2, 3, 1, 4 done clear
  C)
  3, 2, 4, 1 done clear
  D)
  3, 2, 1, 4 done clear
  View Solution play_arrow

• question_answer50)

  Micropyle in flowering plants occurs in :

  1. Seed

  2. Ovule

  3. Ovary

  4. Stigma

  A)
  1, 2 and 3 are correct done clear
  B)
  1 and 2 are correct done clear
  C)
  2 and 4 are correct done clear
  D)
  1 and 3 are correct done clear
  View Solution play_arrow

• question_answer51)

  Directions : (51 - 55)

  Read the passage given below and answer the following questions.

  In a majority of flowering plants, one of the megaspores is functional while the other three degenerates. Only the functional megaspore is the first cell of female gametophyte and develops into the female gametophyte or embryo sac. This method of embryo sac formation from a single megaspore is termed monosporic development. The nucleus of the functional megaspore divides mitotically to form two nuclei which move to the opposite poles, forming the 2-nucleated embryo sac. Two more sequential mitotic nuclear divisions result in the formation of the 4-nucleated and later the 8-nucleated stages of the embryo sac. It is of interest to note that these mitotic divisions are strictly free nuclear, that is, nuclear divisions are not followed immediately by cell wall formation. After the 8-nucleated stage, cell walls are laid down leading to the organisation of the typical female gametophyte or embryo sac. Six of the eight nuclei are surrounded by cell walls and organised into cells; the remaining two nuclei, called polar nuclei are situated below the egg apparatus in the large central cell.

  Formation of embryo sac is called as
  A)
  Megasporogenesis done clear
  B)
  Megagametogenesis done clear
  C)
  Microgametogenesis done clear
  D)
  Microsporogenesis done clear
  View Solution play_arrow

• question_answer52)
  In Polygonum type of embryo sac, the cells are
  A)
  Haploid done clear
  B)
  Diploid done clear
  C)
  Both [a] and [b] done clear
  D)
  Polyploid done clear
  View Solution play_arrow

• question_answer53)
  Egg apparatus in flowering plant consists of
  A)
  Egg and antipodals done clear
  B)
  Polar nuclei done clear
  C)
  Egg and synergids done clear
  D)
  Egg and central cell done clear
  View Solution play_arrow

• question_answer54)
  Oosphere or egg in female gametophyte is
  A)
  3n done clear
  B)
  2n done clear
  C)
  n done clear
  D)
  4n done clear
  View Solution play_arrow

• question_answer55)
  In flowering plants central cell of embryo sac, prior to entry of pollen tube contains :
  A)
  Two haploid polar nuclei done clear
  B)
  One diploid secondary nucleus done clear
  C)
  A single haploid nucleus done clear
  D)
  One diploid and one haploid nucleus done clear
  View Solution play_arrow

• question_answer56)

  Directions : (56 - 60)

  Read the passage given below and answer the following questions.

  In angiosperm, the male gametes are brought to the egg containing embryo sac by a pollen tube. The phenomenon is called siphonogamy. After entering one of the synergids, the pollen tube releases the two haploid non motile male gametes into the cytoplasm of the synergid. One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy. This results in the formation of a diploid cell, the zygote or oospore it further develops into an embryo. False fertilization: The other male gamete moves towards the two haploid polar nuclei or diploid secondary nucleus located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN). As this involves the fusion of three haploid nuclei it is termed triple fusion. The central cell after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm (3n). Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilisation, an event unique to flowering plants.

  Triple fusion involves fusion of :
  A)
  Two male gametes and one egg done clear
  B)
  Two male gametes and secondary nucleus done clear
  C)
  Two eggs and one male gamete done clear
  D)
  One male gamete and two polar nuclei done clear
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• question_answer57)
  In angiosperms, triple fusion produces :
  A)
  Secondary nucleus done clear
  B)
  Polar nucleus done clear
  C)
  Primary endospermic nucleus done clear
  D)
  Zygotic nucleus done clear
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• question_answer58)
  In a monocot, endosperm cells have 24 chromosomes. What shall be the chromosome number in embryo :
  A)
  24 done clear
  B)
  16 done clear
  C)
  12 done clear
  D)
  8 done clear
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• question_answer59)
  Double fertilization in flowering plants involves :
  A)
  Fertilization of egg by two male gametes done clear
  B)
  Fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube done clear
  C)
  Fertilization of egg and central cell by two sperms brought by different pollen tubes done clear
  D)
  Fertilization of egg and central cell by two sperms brought by same pollen done clear
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• question_answer60)
  Triple fusion leading to initiation of endosperm in angiosperms, requires :
  A)
  Fusion of 4 or more polar nuclei and the second male gamete only done clear
  B)
  Fusion of 2 polar nuclei and second male gamete only done clear
  C)
  Fusion of one polar nucleus and second male gamete only done clear
  D)
  All the above types of fusions in different types of angiosperms done clear
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• question_answer61)

  Directions : (61 - 65)

  Read the passage given below and answer the following questions.

  Pollination by wind is more common amongst abiotic pollinations. Wind pollination also requires that the pollen grains are light in weight and non-sticky so that they can be transported in wind currents. They often possess well-exposed stamens so that the pollens are easily dispersed into wind currents and large often-feathery stigma to easily trap air -borne pollen grains. Wind- pollinated flowers often have a single ovule in each ovary and numerous flowers packed into inflorescence; a familiar example is the corn cob i.e., maize. The tassels are stigma and style which wave in the wind to trap pollen grains. Wind-pollination is quite common in Grasses.

  Anemophily mainly occurs in
  A)
  Grasses done clear
  B)
  Legumes done clear
  C)
  Euphorbia done clear
  D)
  Annona done clear
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• question_answer62)
  Pollination by wind occurs in
  A)
  Salvia done clear
  B)
  Vallisneria done clear
  C)
  Coconut done clear
  D)
  Bottle Bruch done clear
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• question_answer63)
  Anemophilous plants have
  A)
  Sticky stigmas done clear
  B)
  Feathry stigmas done clear
  C)
  prominent nectarines done clear
  D)
  Colourful flowers done clear
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• question_answer64)
  Wind pollinated plants have :
  A)
  Prominent nectaries done clear
  B)
  Feathery stigmas done clear
  C)
  Sticky stigmas done clear
  D)
  Colourful flowers done clear
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• question_answer65)
  Wind pollinated flowers are :
  A)
  Small, scented and colourless done clear
  B)
  Small, nonscented and colourless done clear
  C)
  Big, scented and coloured done clear
  D)
  Big, nonscented and colourless done clear
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