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