18 Why are angiosperm anthers called dithecous ? vikas6748 14.03.2019 Biology Secondary School +5 pts. Q:-What is oogenesis? 45. In order to avoid self-pollination,cross-pollination is encouraged in plants as follows : a. Compare the two ecological pyramids of biomass given below and explain the situations in which this is … 19. Join now. Answered Explain three outbreeding devices 1 See answer OR Show diagrammatically the stages of embryonic development from … Also mention the role played by the various cells of theembryosac. Some outbreeding devices used are :-1. Balbharati solutions for Biology 12th Standard HSC Maharashtra State Board chapter 1 (Reproduction in Lower and Higher Plants) include all questions with solution and detail explanation. (b)Name any three outbreeding devices. State what is apomixis. Compare the two ecological pyramids of biomass given below and explain the situations in which this is possible. Make a list of an y three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination . After implantation interdigitation of maternal and foetal tissues takes place. OR Why are angiosperm anthers called dithecous ? Books. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. Explain with the help of an example each. Briefly describe its structure. Explain the importance of each. Summary Pollination We know that that the male and female gametes in flowering plants are produced in the pollen grain and embryo sac, respectively. Describe the structure of its microsporangium. . Find an answer to your question explain three outbreeding devices 1. Describe any three potential applications of genetically modified plants. Describe the structure of its microsporangium. (a) Strategies adopted by flowering plants to prevent self-pollination: 1. Not surprisingly, many species of plants have developed mechanisms that prevent self-pollination. Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 2 Sexual Reproduction in Flowering Plants.. Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants. 2 See answers AionAbhishek AionAbhishek Ahoy!!! ... 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. Make a list of any three outbreeding devices that flowering plants have developed. Why do hermaphrodite angiosperms develop outbreeding devices? (a) Explain any four outbreeding devices that prevent autogamy. 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. 21. (3) OR. Dicliny: It is the condition where one of the two sexes is absent in the flower and flower becomes unisexual male or female (didhnous). Ans. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. There are 4 types of outbreeding devices-1.) Outbreeding Devices: To avoid inbreeding depression and promote outbreeding, the plants have evolved certain devices/contrivances such as: Explain any two such devices with the help of examples. 20. 44. Give any three advantages of sexual incompatibility. This also results in homozygous genes. They r necessary bcuz continued SELF-POLLINATION in flowers causes a downfall in the quality and variety of the products. (a)Explain the process of megasporogenesis. Label any four parts. variations appear due to outbreeding provide adaptability to the changes in … 3 13 . 3 marks Q. 16. Dichogamy: Pollen and stigma of the flower mature at different times to avoid self-pollination.. 3. (b) What is apomixis? This is known as outbreeding. Q.55. Answer: (a) Contrivances for cross-pollination: [Out breeding devices] The following contrivances ensure cross-pollination: 1. (i) Time of pollen release and stigma receptivity are different (not synchronised). Make a list of an y three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination . Artificial Hybridisation 7. Explain with the help of suitable examples why is it required in a community with rich biodiversity. Describe the structure of its microsporangium. 17 Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. Describe the structure of its Microsporangium. (ii) Anther and stigma are placed at different position so that the pollen cannot come in contact with the stigma of … (a) List the three states the annuals and biennial angiosperms have to pass through during their life cycle. Question 1. 10.
(ii) Dichogamy favours cross pollination as it stands as a barrier to self pollination. [1+1+1=3] 13. asked Oct 24, 2018 in Biology by Richa (60.6k points) sexual reproduction in … 19 Draw a diagram of a male gametophyte of an angiosperm. Sol. outbreeding devices class 12th | part 8- reproduction in lower and higher plants in this video lecture I have explain about different outbreeding devices in plants. 29. Types of Pollination: The transfer of pollen grains from the opened anther of the stamen to the receptive stigma of the carpel/pistil is called pollination. Q.56. Thus plants are adapted to promote cross-pollination. Explain any three advantages the seeds offer to angiosperms. This will clear students doubts about any question and improve application skills while preparing for board exams. First of all what are outbreeding devices n why r they necessary-Devices that discourage SELF-POLLINATION & encourage CROSS-POLLINATION are known as outbreeding devices. Q:-With a neat, labelled diagram, describe the parts of a typical angiosperm ovule. Q.57. Outbreeding Devices 5. Depending upon […] Give a brief account of oogenesis. 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. Each pollen grain grows and provides two male gametes for fertilisation of an ovule. Ans. List the adaptive features of water pollinated flowers like Vallisneria. The plants may be monoecious (bearing both male and female flowers, e.g., Maize) or dioecious (bearing male and female flowers on different plants, e.g., Mulberry, Papaya). Q.20.If implementation of better techniques and new strategies are required to Outbreeding devices : Majority of flowering plants produces hermaphrodite flowers which undergo self-pollination. Explain three outbreeding devices. If implementation of better techniques and new strategies are required to provide more efficient What is self incompatibility? Q:-Differentiate between a zoospore and a zygote. Outbreeding and inbreeding strategies recognized in this study are associated with functional groups and isolation of the herbaceous-shrubby communities in the Gran Sabana Plateau. Q. Herkogamy: Flowers possess some mechanical barrier on their stigmatic surface to avoid self-pollination.. 2.
1. Q.3. Log in. ADVERTISEMENTS: In this article we will discuss about the types and agents of pollination. (ii) Dichogamy: Explain three outbreeding devices. [All India 2014] Ans.The three outbreeding devices that flowering plants have developed, so as to encourage cross-pollination are:
(iii) Dichogamy is of two types, viz., protandry and protogyny. 20. Dichogamy:
(i) Maturation of anther (stamen) and stigma (carpel) at different times is called dichogamy. Where and how does it take place? Both, autogamy and geitonogamy are prevented in (a) papaya. _____ In some species , pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of pollen . (b) List and describe any two vegetative propagules in flowering plants. Draw a labeled diagram of embryosac in angiosperms.Name the cell that develop into the embryosac and explain how this cell leads to the formationof Embryosac. In some species, pollen release and stigma recepitivity are not synchronized. Q:-What is triple fusion? Outbreeding Devices. 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. asked Feb 29 in Biology by KumkumBharti (53.8k points) class-12; 0 votes. 3 12 . By analogy, the term is used in human reproduction, but more commonly refers to the genetic disorders and other consequences that may arise from expression of deleterious or recessive traits resulting from incestuous sexual relationships and consanguinity. Continuous self-pollination results in inbreeding depression. After implantation interdigitation of maternal and foetal tissues takes place. Explain the various causes that have brought about this difference. 15.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 outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. Mechanisms that prevent self-pollination Structural. 1. Identify the tissues involved and justify their role. As both types of gametes are non-motile, they have to be brought together for fertilisation to occur. Solution : Outbreeding devices in Angiospermic plants. Log in. Inbreeding is the production of offspring from the mating or breeding of individuals or organisms that are closely related genetically. and explain how they help to encourage cross-pollination. Pollen-pistil Interaction 6. Three outbreeding devices in plants : (i) Difference in maturation time of pollen and stigma or pollen release and stigma receptivity are not synchronised. Outbreeding Devices or Contrivances to Ensure Cross Pollination: (i) Dicliny (Uni-sexuality): Flowers are unisexual so that self pollination is not possible. Why angiosperm anthers are called dithecous? …
a. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. 3 Sol. Physics. 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. Ans. ... As this involves the fusion of three haploid nuclei it is termed triple fusion. Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination. Join now. 3 marks OR Why are angiosperm anthers called dithecous? Ask your question. it has made plants outbreeders and this maintain vigour and vitality of the race. This prevents self-pollination. [1+1+1=3] 12. NEET Botany Sexual Reproduction in Flowering Plants questions & solutions with PDF and difficulty level Gynoecium of a flower may be apocarpous or syncarpous. 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