Outbreeding Devices-Continued self-pollination result in inbreeding depression. Not surprisingly, many species of plants have developed mechanisms that prevent self-pollination. The continued self-pollination leads to chances of inbreeding depression. 8.Regular visits by health experts and veterinary doctor to the farm must be ensured. In some species, pollen release and stigma receptivity are not synchronized that is either the pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of … Continuous self-pollination results in inbreeding depression. Dichogamy: Pollen and stigma of the flower mature at different times to avoid self-pollination.. 3. (c) To combine good qualities of two different breeds by cross breeding and produce a better breed. In some species, pollen release and stigma receptivity are not synchronized that is either the pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of pollen. Demand for aquatic foods especially fish and fish products has also been met by animal husbandry practice. (i) Dicliny: Flowers are unisexual so that self-pollination is not possible. Physics. Pre-fertilisation - Structures and Events - Pollination, 2013-2014 (March) All India Set 1 (with solutions), 2013-2014 (March) All India Set 2 (with solutions), 2013-2014 (March) All India Set 3 (with solutions), CBSE Previous Year Question Paper With Solution for Class 12 Arts, CBSE Previous Year Question Paper With Solution for Class 12 Commerce, CBSE Previous Year Question Paper With Solution for Class 12 Science, CBSE Previous Year Question Paper With Solution for Class 10, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Arts, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Commerce, Maharashtra State Board Previous Year Question Paper With Solution for Class 12 Science, Maharashtra State Board Previous Year Question Paper With Solution for Class 10, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Arts, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Commerce, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 12 Science, CISCE ICSE / ISC Board Previous Year Question Paper With Solution for Class 10. The three out breeding devices that flowering plants have developed to encourage cross-pollination are: i. Flowering plant have developed many devices to discourage self-pollination to encourage cross-pollination. Concept: Pre-fertilisation - Structures and Events - Pollination. Outbreeding, also called outcrossing, allogamy, or xenogamy, is the transfer of gametes from one individual to another, genetically different individual. Books. Explain the importance of each. In order to avoid self-pollination,cross-pollination is encouraged in plants as follows : a. Make a list of any three out breeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. Outbreeding devices : Majority of flowering plants produces hermaphrodite flowers which undergo self-pollination. 16. 4. 2. (b) Improving the  quality of the produce. 1. mulberry, papaya). Outbreeding Devices or Contrivances to Ensure Cross Pollination: (i) Dicliny (Uni-sexuality): Flowers are unisexual so that self pollination is not possible. Outbreeding Devices: To avoid inbreeding depression and promote outbreeding, the plants have evolved certain devices/contrivances such as: They include super ovulation and embryo transplantation, and multiple ovulation embryo transfer technology (MOET). Double fertilization is reported in plants of both, castor and groundnut. Ans. It replaces the use of sugar in many industries. 3. Answer. Animals with high yielding potential and those who are resistant to diseases must be selected. Natural methods. 7. Outbreeding devices : (i) In order to avoid self-pollination, cross-pollination is encouraged in plants as follows: (a) Avoiding synchronization : In some species, pollen release and stigma receptivity are not synchronized. 1. On the commercial aspect,  it also fetches a lot of money from export of the animal products. 10. variations appear due to outbreeding provide adaptability to the changes in … Which one of the following statement is false in respect of flowering plants? The outbreeding devices in flowering plants which encourage crosspollination are (i) Dicliny: Flowers are unisexual so that self-pollination is not possible. 232, Block C-3, Janakpuri, New Delhi, Parthenocarpy can be induced through the application of growth hormones 2. It can be either cross-pollination or self-pollination. Explain. In some species, pollen release and stigma receptivity are not at the same time. It allows the desirable qualities of two different breeds to be combined and produces high yielding breeds. iii. Continued self pollination in plants results in inbreeding depression Explain any three outbreeding devices developed by plants to discourage self pollination - Biology - Sexual Reproduction in Flowering Plants Give any three advantages of sexual incompatibility. (ii) Dichogamy: Three outbreeding devices that flowering plants have developed: Receptivity of stigma and release of the pollen grain is not synchronized, i.e., stigma becomes receptive much before pollens are released or after they are released to avoid self-pollination. Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 2 Sexual Reproduction in Flowering Plants. Question 1. Make a list of an y three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination . Autogamy: Transfer of pollen grains from the anther to the stigma of the same flower.Geitonogamy: Transfer of pollen grains from the anther to the stigma of another flower of the same plant.Two devices that prevent both autogamy and geitonogamy are:(i) Self – incompatibility: This is a genetic mechanism & prevents self-pollen from fertilising the ovules by inhibiting pollen germination or pollen tube growth in … Flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. In some species, pollen release and stigma recepitivity are not synchronized. https://www.zigya.com/share/QklFTjEyMTExNjky. Explain. Milking, storage and transport of milk must be done efficiently. Reasons for Outbreeding Mechanism Inbreeding Depression: The reason behind the adoption of such techniques by plants is that due to continued in-breeding, plants can develop a condition called inbreeding depression, leading to unhealthy offspring. Find an answer to your question make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross p… Search 1 Make a list of an y three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination . Explain any two devices by which autogamy is prevented in flowering plants. Delhi - 110058. maize) or dioecious bearing male and female flowers on individual plants (e.g. ... Autogamy is prevented and cross-pollination is favoured in flowering plants by following devices: (i) Dichogamy: Sometimes the stamens and stigma of a bisexual flower mature at different time to prevent autogamy. The pistil is the female reproductive part of a flowering plant comprising of the ovary, style, and stigma. Label filiform apparatus, chalazal end, hilum, antipodals, male gametes and secondary nucleus.3 17 Make a list of any three outbreeding devices that flowering plants have developed and explain … © Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants. The three out breeding devices that flowering plants have developed to encourage cross-pollination are: i. Examples: Apple, grape, (iii) Self-sterility: Pollen grains of a flower do not germinate on the stigma of the same flower because of the presence of similar self-sterile genes. mulberry, papaya). Self incompatibilty : It is a method used to prevent the germination of pollen grains on the stigma of the same flower to prevent self fertilisation .eg, tobacco,mustard and potato plant. In constructing population genetic models of outbreeding devices, one can combine inbreeding depression with this factor in a single para-meter 8, defined as follows. The outbreeding devices in flowering plants which encourage crosspollination are. It provides various animal products like milk, eggs, meat, wool, silk, honey etc used by the humans. 2. Artificial methods. Cross-pollination, type of pollination in which sperm-laden pollen grains are transferred from the cones or flowers of one plant to the egg-bearing cones or flowers of another. 6. (b) Honey is used as a part of many indigenous drugss as it has medicinal properties. Out of these methods, cross breeding is the best method of animal breeding because it is breeding between the superior males of one breed are mated with superior females of another breed. ii. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. A. Anthers are usually versatile Book for Class 12 Biology Chapter 2 Reproduction... 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