Grade XI. Biology. (Application Based Questions) #GrowWithGreen
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1 Grade XI Biology (Application Based Questions) #GrowWithGreen
2 Questions 1. Use the following information to answer the question (a) Identify the tissue systems labelled I, II and III in the given figure. (b) Which labelled structure produces root hair and trichomes? Mention its function in a plant. (c) Explain the basic characteristics and functions of the tissue system labelled III. 3 marks 2. (a) Identify the technique illustrated in the given figure.. 3 marks
3 (b) Name three vegetables that have been produced successfully using this technique. (c) What is the importance of the aerating tube in the given setup? (d) Why is it essential to use purified water and mineral salts in this technique? 3. What will happen if (a) blood group A is given to a person having blood group AB (b) blood group O is given to a person having blood group A 2 marks 4. Why do the immune responses of old people become weak? 2 marks 5. (a) Illustrate diagrammatically the haplo diplontic pattern of life cycle. Give examples of algae that show this pattern of life cycle. (b) Explain how bryophytes and pteridophytes differ in this pattern of life cycle? 3 marks
4 Solutions 1. (a) The tissue systems labelled I, II and III in the given figure show epidermal tissue, vascular tissue and ground tissue systems respectively. (b) The root hair and trichomes are the extensions of epidermis labelled I in the given figure. The root hair present in roots help in absorption of water and minerals whereas trichomes present on the stem help to prevent water loss. (c) Ground tissue system includes all the plant tissues except epidermis and vascular bundles. It consists of simple tissues such as parenchyma, sclerenchyma and collenchyma. In primary stem and roots, the ground tissue is represented by the parenchyma present in cortex, pericycle, pith and medullary rays. In the case of leaves, the ground tissue is shown by a thin walled chloroplast containing cells called mesophyll. The ground tissue performs various functions like providing support, transportation, storage of water and food reserves and photosynthesis in case of mesophyll. 2. (a) The technique illustrated in the given figure is known as hydroponics. It is the method of growing plants in a nutrient solution in absence of soil. (b) Hydroponics has been successfully employed for the commercial production of vegetables like tomato, seedless cucumber and lettuce. (c) The aerating tube supplies adequate oxygen to the roots, necessary for the optimum growth of the plant. (d) Normal water and mineral salts contain various impurities that may hinder the growth of plants in hydroponics.. Thus, purification of water and nutrients is important to rule out the influence of these impurities. 3. (a) Blood group AB has both A and B antigens, but lacks antibodies; hence, people having blood group AB can receive blood from people having blood groups A, B and O. That is why blood group AB is commonly known as a universal acceptor. (b) Blood group O is a universal donor because it does not contain any antigen on RBC s surface, against which antibodies can be produced. Hence, it can be donated to any person who requires blood, without any disaffects. 4. The immune responses of old people become weak because of the degeneration of the
5 5. (a) thymus in them. The thymus plays a major role in the development of the immune system. It secretes the peptide hormones called thymosins, which are essential for the immune system. They regulate the differentiation of T lymphocytes, which are involved in cell mediated immunity. They also promote the production of antibodies to provide humoral immunity. Ectocarpus, Polysiphonia and Kelps are the algae that show haplo diplontic pattern of life cycle. (b) Bryophytes and pteridophytes exhibit haplo diplontic pattern of life cycle. This pattern is an intermediate between the haplontic and diplontic patterns of life cycle. In this pattern of life cycle, the gametophytic and sporophytic phases are multicellular. However, bryophytes and pteridophytes differ in dominant phases. In bryophytes, a haploid gametophyte is represented by a dominant, independent, photosynthetic, thalloid phase whereas in pteridophytes, diploid sporophyte is represented by dominant, independent, photosynthetic phase.
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