Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. Make a list of any three out breeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. (a) Strategies adopted by flowering plants to prevent self-pollination: 1. Dichogamy: Pollen and stigma of the flower mature at different times to avoid self-pollination.. 3. Make a list of any three out breeding devices that flowering plants have developed and explain how they help to encourage cross pollination. Because the majority of flowering plants produce hermaphrodite flowers and are likely to come in contact with the stigma of the same flower. Herkogamy: Flowers possess some mechanical barrier on their stigmatic surface to avoid self-pollination.. 2. Pink flower = female flower; Blue flower = male flower; Bicolored flower = bisexual/hermaphrodite flower. Students who are in class 12th or preparing for any exam which is based on Class 12 Biology can refer NCERT Biology Book for their preparation. Self-pollination is common and more likely to happen in the case of hermaphrodite flowers but a successive series of self-pollination affects negatively and causes inbreeding depression. The first two plants show the dioecious condition in which male and female flowers are borne on separate plants while the fourth plant exhibits monoecy, where male and female flowers are borne on the same plant. Thus plants are adapted to promote cross-pollination. Describe the structure of its microsporangium. NCERT Book for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants is available for reading or download on this page. The flowering plants, also known as Angiospermae (/ ˌ æ n dʒ i oʊ ˈ s p ɜːr m iː /), or Magnoliophyta (/ m æ ɡ ˌ n oʊ l i ˈ ɒ f ɪ t ə,-oʊ f aɪ t ə /), are the most diverse group of land plants, with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species. Not surprisingly, many species of plants have developed mechanisms that prevent self-pollination. Mechanisms that prevent self-pollination Structural. 3 Sol. Some—e.g., date palms (Phoenix dactylifera) and willows (Salix species)—have become dioecious; that is, some plants produce only “male” (staminate) flowers, with the rest producing only “female” (pistillate or ovule-producing) ones. asked Oct 11, 2018 in Biology by Supria ( 63.9k points) sexual reproduction in flowering plants Describe the structure of its microsporangium. Outbreeding Devices. Question.19. OR Why are angiosperm anthers called dithecous ? This is known as outbreeding. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination ? Outbreeding Devices: ADVERTISEMENTS: Flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. Out breeding devices present in flowering plant 1. - 1179184 Out breeding devices are used to prevent self pollination, which is the main cause of low variety and quality of the plant product and thereby encourage cross pollination to occur between plants. This also results in homozygous genes. Answer : The three outbreeding devices to encourage, cross-pollination OR Why are angiosperm anther called dithecous ? Some outbreeding devices used are :-1. Fig.4.1.Terminology.
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