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