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Class 9 Science Chapter 17 Introduction to, Biotechnology Textbook Questions and, , Answers, , 1. Each of the following statements is wrong., Rewrite them correctly by changing either one, , or two words., , a. Simple squamous epithelium is present in the, respiratory tract., , b. Glandular epithelium is present in kidneys., , c. Chlorenchyma helps the plant to float in, water., , d. Striated muscles are also called involuntary, muscles., , e. Chloroplast is present in permanent tissue., Answer:, , a. False. Ciliated columnar epithelium is present, in respiratory tract., , b. False. Cuboidal epithelium is present in, kidneys., , c. False. Aerenchyma helps the plant to float in, water., , d. False. Striated muscles are also called, voluntary muscles., , e. False. Chlorenchyma is present in permanent, , tissue.
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2. Identify the odd word and explain why it is, odd., , a. Xylem, phloem, permanent tissue,, meristematic tissue., , Answer:, , Meristematic tissue. It has the ability to divide, , whereas the others have lost the ability to, , divide., , b. Epithelium, Muscle fibre, nerve fibre, the, epidermis., Answer:, , Epidermis. It is a plant tissue whereas the, , others are animal tissues., , c. Cartilage, bone, tendon, cardiac muscle., , Answer:, Cardiac muscle. It is a muscular tissue whereas, , the others are connective tissues.
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3. Write the names of the following tissues., , a. Tissue lining inner surface of mouth., , Answer:, , Squamous epithelium., , b. Tissue joining muscles and bones., , Answer:, , Tendon, , c. Tissue responsible for increasing height of, plants., Answer:, , Apical meristem., , d. Tissue responsible for increasing girth of, , stem., Answer:, , Lateral meristem.
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4. Write the differences., , Simple tissue and complex tissues in plants., , Answer:, , Simple Tissue in, , plants, , (i) They are made up, of only one type of, , cells., , (ii) They are found in, , all parts of the plant., , (iii) They perform, different functions like, , storage, , of food, support,, giving strength etc., , (iv) Examples Parenchyma,, Collenchyma,, , Sclerenchyma., , Complex Tissues in, , plants, , (i) They are made up of, more than one type of, , cells., , (ii) They are found in the, vascular regions of the, , plant., , (iii) They mainly perform, , the function of, , conduction of water and, food., , (iv) Example - Xylem, , and phloem.
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5. Write short notes., , a. Meristematic tissue., , Answer:, , ¢ Meristematic tissue is present in specific, parts of a plant where growth takes place., , * Cells of meristematic tissue contain thick, cytoplasm, a conspicuous nucleus and a, thin cell wall and are compactly packed, together., , e Vacuoles are usually absent in these cells, and they are highly active., , e The main function of meristematic tissue, is to bring about plant growth., , ¢ According to the location, meristematic, tissues are of three types: Apical, , meristem, intercalary meristem and, , lateral meristem.
