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Polyribosome. Polyribosomes are the sites for protein synthesis. Q. 13

Polyribosome. Polyribosomes are the sites for protein synthesis. Q. 13. Write down differences between Monera and Protista on the basis of following points :

  1. Nature of cell wall component.
  2. Genetic material.
  3. Location of respiratory apparatus.
  4. Types of cytoplasmic ribosome.
  5. Location of extra chromosomal DNA.
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lie close to each other so that self-pollinatio can occur. Some plants such as lol (common pansy), Oxalis, and Commelth produce two types of flowers chasmogamous flowers which are similar flowers of other species with exposed anther and stigma. and cleistogamous flowers whic de not open at all (Figure 2.9c). In such flowers the anthers and stigma lie close to each other When anthers dehisce in the flower buds pollen grains come in contact with the stigme to effect pollination. Thus, cleistogamous flowers are invariably autogamous as there no chance of cross-pollen landing on th stigma. Cleistogamous flowers produce assured seed-set even in the absence of pollinators. Do you think that cleistogamy is advantageous or disadvantageous to the plant? Why? (ii) Geitonogamy-Transfer of pollen grains from thellanther to the stigma of another flower of the same plant. Although geitonogamy is functionally cross-pollination involving a pollinating agent, genetically it is similar to autogamy since the pollen grains come from the same plant. (iii) Xenogamy - Transfer of pollen grains from Lanther to the stigma of a different plant (Figure 2.9b). This is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma. Agents of Pollination : Plants useltwo abiotic (wind and waterl and one biotic (animals) agentd to achieve pollination. Majority of plants use biotic agents for pollination. Only a small proportion of plants use abiotic agents. Pollen grains coming in contact with the stigma is a chance factor in both wind and water pollination. To compensate for this uncertainties and associated loss of pollen grains, the flowers produce enormous amount of pollen when compared to the number of ovules available for pollination.
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Question Text
Polyribosome. Polyribosomes are the sites for protein synthesis. Q. 13. Write down differences between Monera and Protista on the basis of following points :
TopicBiology in Human Welfare
SubjectBiology
ClassClass 11