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. Some outbreeding devices used are :-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. Fig.4.1.Terminology. 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. Outbreeding Devices. Herkogamy: Flowers possess some mechanical barrier on their stigmatic surface to avoid self-pollination.. 2. Not surprisingly, many species of plants have developed mechanisms that prevent self-pollination. 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. OR Why are angiosperm anthers called dithecous ? (a) Strategies adopted by flowering plants to prevent self-pollination: 1. Pink flower = female flower; Blue flower = male flower; Bicolored flower = bisexual/hermaphrodite flower. This is known as outbreeding. asked Oct 11, 2018 in Biology by Supria ( 63.9k points) sexual reproduction in flowering plants - 1179184 Describe the structure of its microsporangium. Answer : The three outbreeding devices to encourage, cross-pollination 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. OR Why are angiosperm anther called dithecous ? NCERT Book for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants is available for reading or download on this page. Thus plants are adapted to promote cross-pollination. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination ? Question.19. Mechanisms that prevent self-pollination Structural. Somee.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. Describe the structure of its microsporangium. 3 Sol. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. Out breeding devices present in flowering plant 1. This also results in homozygous genes. Outbreeding Devices: ADVERTISEMENTS: Flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. The flowering plants, also known as Angiospermae (/ n d i o s p r m i /), or Magnoliophyta (/ m n o l i f t ,-o f a t /), are the most diverse group of land plants, with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species. 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.
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