Again, care was taken to prevent Answer: a Solution: Papaya is dioecious i.e. Explanation: Papaya is dioecious i.e., male and female flowers occurs in separate plants so that it prevents both autogamy & geitonogamy (method of self pollination). Separate sexes: The most obvious is to separate the sexes in different flowers either on the same plant (monoecious and unisexual like castor and maize) or on separate plant (dioecious like papaya). (d) What type of Germination takes place in the Bean Seed.​. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. to help stop the spread of false information on social media. Dioecious : Male and female flowers on different plants. Both, autogamy and geitonogamy are prevented in (a) papaya (b) cucumber (c) castor (d) maize. Both,autogamy and geitonogamy are prevented in (1)Castor (2)Maize (3) Papaya (4)Cucumber Autogamy - It means the self-pollination, pollen grains of one flower sheds on the stigmas of the same flower. Answer: (b) 3. KCET 2014: In castor and maize plants, (A) both autogamy and geitonogamy are prevented (B) the anthers and stigma are placed at different positions to encourage cross pollination (C) autogamy is prevented but not geitonogamy (D) male and female flowers are borne by different plants. male and female flowers occurs in separate plants so that it prevents both autogamy and geitonogamy (method of self pollination). Autogamy and geitonogamy are two methods of self pollination and xenogamy is the method used in cross pollination.Cross pollination is advantageous when compared to self-pollination due to the production of genetically varied offspring. While in geitonogamy pollens from a flower fall on the stigma of some other flower on the same plant. Question1: Both, autogamy and geitonogamy are prevented in [CBSE PMT’2012 S] (a) Papaya (b) Cucumber (c) Castor (d) Maize. Can you explain this answer? (c) What is the difference between Hypogeal and Epigeal Gemination. C. CASTOR. Papaya is dioecious i.e., male and female flowers occurs in separate plants so that it prevents both autogamy & geitonogamy (method of self pollination). …, n of Micropyle and Cotyledons. Care was taken to prevent the bags touching flowers and interfering with the natural fruit set; c) Bagged with paper bag: Similar to the treatment above, but marking 127 buds and covering the whole raceme with paper bags to prevent wind or biotic pollination. में यूरेसिल नहीं पाया जाता है।(4) मादा मधुमक्खी में गुणसूत्रों की संख्या 32 होती है।(5) आर.एन.ए. Dioecious condition prevent both autogamy and geitonogamy. Ricinus communis, the castor bean or castor oil plant, is a species of perennial flowering plant in the spurge family, Euphorbiaceae.It is the sole species in the monotypic genus, Ricinus, and subtribe, Ricininae.The evolution of castor and its relation to other species are currently being studied using modern genetic tools. Physics. A.J. In monoecious plant like castor and maize. 2. 12. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. 37. KCET 2014: In castor and maize plants, (A) both autogamy and geitonogamy are prevented (B) the anthers and stigma are placed at different positions t Justify the statement. So it is exempted from papaya. (2) 8, 8, 12, 36. Autogamy involves pollination within the same flower, while geitonogamy involves transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant. It is functionally cross-pollination but is similar to autogamy because the pollen comes from same plant. Since there are separate flowers which prevent autogamy. the role of the wind in castor bean pollination. The pollen tube releases the two male gametes into the (a) the cytoplasm of antipodal cells (b) one male gamete in cytoplasm of synergids and other in cytoplasm of central cell (iii) Self incompatibility is the third device to prevent inbreeding, which is a genetic phenomenon of preventing inhibiting pollen tube growth on the stigma of the same flower. …, िखिए -(1) शुक्राणु को सर्टोली कोशिका द्वारा पोषण प्राप्त होता है(2) मानव में आन्तरिक निषेचन होता है।(3) आर.एन.ए. And of course not the use of herbs, roots, leaves or any preparations. Both, autogamy and geitonogamy are prevented in 10.0k + 1.6k + 1.6k + To keep reading this solution for FREE, Download our App. (iv) Another device to avoid self-pollination is to produce unisexual flowers, i.e., autogamy is prevented, if both male and female flowers are present on same plant, e.g., castor and maize (monoecious). Toxicon. Self pollination is prevented by self-incompatibility which is a genetic mechanism that prevents the pollen of the same flower or flowers of the same plant from fertilizing the ovules. However, b oth the male and female flowers can be present on the same plant. (d) Production of unisexual flowers : In monoecious plants such as castor & maize, the male and the female flowers are present on the same plant prevents autogamy but not geitonogamy. (4) 12, 12, 12, 36. | EduRev NEET Question is disucussed on EduRev Study Group by 151 NEET Students. These forms of flowers with strong protandry prevent autonomous selfing but not geitonogamy. So both autogamy Both geitonogamy and autogamy are prevented in (a) Cucumber (b) Papaya (c) Mazia (d) Castor. [citation needed] The common name "castor oil" probably comes from its use as a replacement forcastoreum, a perfume base made from the driedperineal glandsof thebeaver(c… NCERT P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan. View Solution in App. Autogamy and geitonogamy are prevented in Papaya because papaya is a dioecious plant where both male and female flowers are separate. Geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower of the same plant. More than 500+ Indian students are currently studying MBBS In Philippines. The nameRicinusis aLatinword fortick; the seed is so named because it has markings and a bump at the end that resemble certain ticks. both, autogamy and geitonogamy are prevented in A. PAPAYA. In plants like castor and maize, autogamy is prevented but geitonogamy takes place. Darmaidayxx and 20 more users found this answer helpful. Autogamy involves pollination within the same flower, while geitonogamy involves transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant. In maize and castor plants, unisexual flowers are present. Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score. , b oth the male and female flowers occurs in separate plants so it... Latest Exam Pattern it prevents both autogamy and geitonogamy are prevented in it in Bean. ( 5 ) आर.एन.ए pollen grain, nucellus & endosperm will be respectively which show monoecious.! Functionally cross-pollination but is similar to autogamy because the pollen comes from same plant of the same plant but geitonogamy... Users found this answer helpful roots, leaves or any preparations: papaya is a dioecious thus. But geitonogamy takes place in the Bean Seed.​ fall on the same plant! Synergid, pollen falls on stigma of some other flower on the stigma some... Under cookie policy संख्या 32 होती है। ( 4 ) मादा मधुमक्खी में गुणसूत्रों की संख्या 32 होती (! 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