Epidermis is a protective layer to all the plant parts. Muscular tissue (contractile tissue): It helps the movement of the body by contraction and relaxation. (b) What is the lining of small intestine made up of? 12. (b) nerve endings (b) Intercellular spaces are absent in sclerenchymatous tissues. Looking at this, you will be able to figure out what the important questions are. Spatial total RNA-sequencing (STRS) combines in situ polyadenylation with existing spatial transcriptomics technologies to enable a broader view of the transcriptome in tissues. For students that need some help in scoring some good marks in their examinations for the finals, there is no doubt that taking the help of extra questions for class 9 science chapter 6 will really be a very good idea as they might find exactly what they are looking for and much more. Each consists of specialized cells grouped together according to structure and function. Rishi brought an aquatic plant which was floating on the surface to the science laboratory of water. Xylem consists of four elements which are: [citation needed], Comparative biomechanics overlaps strongly with many other fields, including ecology, neurobiology, developmental biology, ethology, and paleontology, to the extent of commonly publishing papers in the journals of these other fields. Amid rising prices and economic uncertaintyas well as deep partisan divisions over social and political issuesCalifornians are processing a great deal of information to help them choose state constitutional officers and Tissue A and tissue B constitute tissue C. A carries water while B carries food for the plants. [3] Tumours are generally detected when they cause symptoms, such as a neck mass or affecting nearby structures such as the superior vena cava;[21] detected because of screening in patients with myasthenia gravis, which has a strong association with thymomas and hyperplasia;[3] and detected as an incidental finding on imaging such as chest x-rays. Proteins are assembled from amino acids using information encoded in genes. (a) brain (c) (iv) (c) Apical and intercalary meristems are permanent tissues. (b) Refer to answer 7. It fills the space inside the organs, supports internal organs and helps in repair of tissues. Thymus [4] This process continues into old age, where whether with a microscope or with the human eye, the thymus may be difficult to detect,[4] although typically weighs 515 grams. [NCERT Exemplar] What is the Role of the Epidermis in Plants? (b) phloem fibres Cells are very active, and have dense cytoplasm and thin cellulose. (a) move downwards Water reaches leaves by xylem vessels, where evaporation takes place by stomata. [3], The atrophy is due to the increased circulating level of sex hormones, and chemical or physical castration of an adult results in the thymus increasing in size and activity. Answer: (a) collenchyma Answer: Answer: Connective tissue (a) Cork cells possess _____ on their walls that makes them impervious to gases and water. (d) Cuboidal epithelium Answer: Blood is a type of connective tissue. The walls of the sclerenchymatous cells are thickened due to presence of lignin. Draw a well labelled diagram of cardiac muscle found in the human body. After 3 years the nail will Question 4. 13. (c) Simple: Parenchyma/collenchyma/sclerenchyma Complex: Phloem/xylem. The transport is bidirectional through the phloem. (h) Phloem transports ______ from ______ to other parts of the plant. Answer: (d) Epithelial layer is permeable layer. (c) suberin The process of taking up a permanent shape, size, and a function is called differentiation. The tissue is complex as it is organised into organs and organ systems. The genetic code is a set of three-nucleotide sets called codons and each three-nucleotide combination designates an amino acid, for example AUG Blood is a special connective tissue consisting of a fluid matrix, plasma, and formed elements. Which of the following tissues has dead cells? Classify permanent tissues and describe them. (b) Group of similar cells which perform similar functions. (iii) Cardiac muscle fibres Nervous tissue: Its receiver stimulates and transmit the messages, Involuntary Muscles are attached to visceral organs. They are found in the brain, spinal cord and nerves. Thus, it is difficult to pull out the husk of a coconut. In children, the thymus is pinkish-gray, soft, and lobulated on its surfaces. [2] The branches reach the thymus and travel with the septa of the capsule into the area between the cortex and medulla, where they enter the thymus itself; or alternatively directly enter the capsule. (b) (ii) (iii) What values are shown by Rishi? Name the different types. Provide American/British pronunciation, kinds of dictionaries, plenty of Thesaurus, preferred dictionary setting option, advanced search function and Wordbook Naver English-Korean Dictionary Q3. Most of the components of phloem except phloem fibres are living cells. Which biochemicals compose the solid matrix of cartilage? Provide examples for each. Write two differences between striated and smooth muscles. (a) suberin Answer: (f) Xylem; phloem Question 16. When they contract, they pull the tendon to move the bones and help in the movement of limbs. [citation needed]. Cartilage is present in the tip of nose, outer ear joints, between adjacent bones of the vertebral column. About Our Coalition - Clean Air California Lignin makes the cells compact and leaves no intercellular spaces. What is the role of epidermis in plants? The process of taking up a permanent shape, size, and a function is called differentiation; this also leads to the development of permanent tissues. A thick layer of subcutaneous fat functions as an insulating coat that prevents heat loss from the body and helps to keep the body of the animal warm in colder environment. Xylem helps to transport water and minerals. About Our Coalition. Tissues Class 9 Extra Questions Very Short Answer Type. pulmonary veins and superior vena cava) where these veins enter the heart. More Resources for CBSE Class 9. 9. Question 3. E.g., skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue. [13] Some of this is because of hormones and cytokines secreted by cells within the thymus, including thymulin, thymopoietin, and thymosins. What is the function of suberin? Cells of this tissue divide throughout their life. Regulates temperature by distributing heat within the body, WBCS protect due body from disease and helps in wound healing. A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. [NCERT Exemplar] Green tea also inhibits the aggrecanases which degrade cartilage. Example: Xylem, Phloem, etc. Answer: Ultraviolet Question 3. The heat loss will be less when the layer of subcutaneous fat is thicker. These cells produce and maintain the cartilaginous matrix. Ans: Thick layer of subcutaneous fat acts as an insulator. It is present in the aquatic plants, example in their floating leaves. This would be the world's standard medical book for the next 1,400 years. It develops from the mesenchyme derived from the mesoderm the middle embryonic germ layer. Anuria. Why? (b) (iv) b) Lateral meristems It occurs on the sides almost parallel to the long axis of the root, stem and its branches. Which is not a function of epidermis? (c) Skeletal muscles contract and pull the ligament to move the bones. PPIC Statewide Survey: Californians and Their Government (a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole. Question 4. Therefore is necessary to study wall mechanics and hemodinamics with their interaction. a) Tissue that forms the inner lining of our mouth. With growing understanding of the physiological behavior of living tissues, researchers are able to advance the field of tissue engineering, as well as develop improved treatments for a wide array of pathologies including cancer. Write a short note on phellogen. ), They are involuntary in action(walls of tubular organs, blood vessels etc.). Chapter 6 important questions in PDF format, so that students can easily prepare for their examinations. Tissues Class 9 Extra Questions Science Chapter 6 [35] Hagfish possess a protothymus associated with the pharyngeal velar muscles, which is responsible for a variety of immune responses. (d) Branches of a tree move and bend freely in high wind velocity. sunflower, tomato etc. Answer: How are they different from one other ? Blood is considered as a type of connective tissue as they have the same origin as other types of 14. Solution: They have only a small amount of cementing material between then and almost no intercellular space. Then the neuron has a single long part(axon) and many short, branched parts(dendrites). It is present in bones of the vertebral column, limbs and hands in adults. Aerenchyma helps the leaves of lotus plant to float on water. (b) Adipose tissue They help to coordinate the various functions of the body. neuro = nerve), is present in the brain, spinal cord and nerves. The intercellular matrix may be like jelly, fluid, dense or rigid. Body tissues conclusively make up body organs and various parts. Cells of this tissue are very active, have dense cytoplasm, thin walls and prominent nuclei. Solution: BIO 201 Chapter 9 Take up the quiz below and prove it. There are five types of connective tissues: Answer the following: [19], Myasthenia gravis is an autoimmune disease most often due to antibodies that block acetylcholine receptors, involved in signalling between nerves and muscles. Numerical methods are hence applied in almost every biomechanical study. [2] Sometimes the veins end directly in the superior vena cava. [12] This depends on the strength of binding between the TCR and MHC class 1 or class 2. Answer: Areolar connective tissue helps in the repair of tissue. Then the neuron has a single long part(axon) and many short, branched parts(dendrites). Epidermis is a layer of parenchymatous cells that forms the outermost covering of plant body. It replaces epidermis of stem and roots. (f) Skeletal muscles contract and pull the tendon to move the bones. The point of attachment is a serine (Ser) residue to which the glycosaminoglycan is joined through a tetrasaccharide bridge (e.g. Question 23. Ans: A neuron comprises a cell body from which long thin hair-like parts(arise). (c) group of similar cells which perform specific functions. Involuntary muscles function on their own. Describe the structure and function of different types of epithelial tissues. (e) The husk of a coconut tree is made up of sclerenchyma cells which have lignified cell walls. (c) lateral meristem (v) To make tissue impervious to gases and water. Q2. (b) conducting tissue Microsoft is quietly building an Xbox mobile platform and store. [32], The importance of the thymus in the immune system was discovered in 1961 by Jacques Miller, by surgically removing the thymus from one-day-old mice, and observing the subsequent deficiency in a lymphocyte population, subsequently named T cells after the organ of their origin. 24. Browse Articles | Nature Medicine (a) Because the meristematic cells are actively dividing cells and there is no need of storage. Answer: The arteries supplying the thymus are branches of the internal thoracic, and inferior thyroid arteries, with branches from the superior thyroid artery sometimes seen. [7], Comparative biomechanics is the application of biomechanics to non-human organisms, whether used to gain greater insights into humans (as in physical anthropology) or into the functions, ecology and adaptations of the organisms themselves. Through blood. (c) Apical and intercalary meristems are not permanent tissues but they are meristematic tissues which remain in continuous state of division. The layer of oily substance will close the stomata present in leaves and this would decrease the rate of transpiration. Answer: A group of cells that are similar in structure and work together to do a peculiar function is called tissue. Leonardo da Vinci studied anatomy in the context of mechanics. Ans: Epidermis is the Outer protective covering of plants: Epidermis is covered with a waterproof coating or layer called cuticle which can reduce water loss. The MHC presents an antigen to the T cell receptor, which becomes active if this matches the specific T cell receptor. The functions of areolar tissues are: Question 11. It provides buoyancy because of the air trapped inside which helps water hyacinth in floating because of the air trapped inside. The only living component of xylem is xylem parenchyma. Due to presence of a chemical substance called suberin. It is due to the presence of These are attached to the bones by tendons. Bone: Question 6. (b) Smooth muscles contract and pull the tendons to move the bones. [33][34] Until the discovery of its immunological role, the thymus had been dismissed as a "evolutionary accident", without functional importance. 18. (d) intercalary meristem. (ii) Epidermis has thick waxy coating of cutin in desert plants. It is primarily a mechanical tissue and provides mechanical strength to the plant part It is primarily a storage tissue and stores nutrients and water in stem and roots. [19], Galileo Galilei, the father of mechanics and part time biomechanic was born 21 years after the death of Copernicus. Nervous tissue is a tissue made of neurons. Transpiration, i.e., loss of water takes place through them. Red blood cells of mammals, vessels (xylem elements) and sieve tube cells (phloem elements) lose their nuclei at maturity. Film. (d) bronchi of lungs. (ii) Removal of cutin would increase the amount of water loss from the leaves of the plants. a) Intercellular spaces are absent in sclerenchyma tissues. Osteoarthritis Define tissue. It is the main tissue that provides structural frame to the body. On the aerial plant parts, it secretes a thick, waxy, water-resistant layer called cuticle on its outer surface. It also helps in combating foreign toxins. Question 12. Solution: [3] The thymus lies beneath the sternum, rests on the pericardium, and is separated from the aortic arch and great vessels by a layer of fascia. Match the column (A) with the column (B). Cork: It is protective in function. Answer: (c) (iii) and (iv) Simple (made of one type of cell) or complex (made of more than one type of cells). It is made up of four types of elements: sieve tubes, companion cells, phloem fibres and the phloem parenchyma. Students can also avail the answers to these questions. Being a poor conductor of heat, it reduces heat loss from body, i.e., it regulates body temperature. (a) intercalary meristem (d) Respiratory tract. (c) inorganic, organic substances. chondroitin sulfate-GlcA-Gal-Gal-Xyl-PROTEIN). Answer: The cells formed by meristematic tissue later lose the ability to divide as a result permanent tissue is formed. Solution: Name the different components of xylem and draw a living component. Answer: Answer: It is a group of cells similar in origin and arrangement, they are specialized to perform a particular function. CBSE Class 9 Science Chapter-6 Important Questions - Free PDF Download. (e) Epithelial layer does not allow regulation of materials between body and external environment. [26] Cysts usually just contain fluid and are lined by either many layers of flat cells or column-shaped cells. Do you need help with your Homework? [1] Other cells are also present in the thymus, including macrophages, dendritic cells, and a small amount of B cells, neutrophils and eosinophils. Solution: Tendon is a type of connective tissue. Prop 30 is supported by a coalition including CalFire Firefighters, the American Lung Association, environmental organizations, electrical workers and businesses that want to improve Californias air quality by fighting and preventing wildfires and reducing air pollution from vehicles. (d) Movement of chocolate in your intestine [NCERT Exemplar] The cells which are specialized in a function are grouped together and form a particular type of tissue. (d) Epithelial cells with cilia are found in _______ of our body. Draw well labelled diagram. NCERT Solutions For Class 9 Science (d) Cartilage is a form of connective tissue. The process of transpiration does not occur properly when the leaves are covered by a layer of oily substance. A T cell that does react will survive and proliferate. c) Tissue that transports food in plants. Tracheids and vessels are tubular structures. List the characteristics of cork. a) Apical meristems Occurs at the growing tips of roots and shoots and brings about an increase in length of the plant. Bone and Cartilage are the specialised forms of connective tissue. 15. Water hyacinth floats on the water surface. Epigallocatechin-3 galate inhibits IL-1induced proteoglycan release and type 2 collagen degradation in cartilage explants. Which cells are responsible for contraction and relaxation movements? (c) Areolar In most sample papers there are some questions which are repeated. Lateral meristem (cambium): It is present on the lateral sides of stem and roots. Biomechanics Example: parenchyma, collenchyma, etc. It also covers the ovaries and lines the sperm-producing tubules. d) Tissue that connects muscles to bones in humans. Striated muscles provide the force for locomotion and all other voluntary movements of the body.
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