NCERT QUESTIONS
TRUE OR FALSE (T OR F)
STRUCTURAL ORGANIZATION IN ANIMALS:ANIMAL TISSUES
1.Arrival of the disturbance at the neuron‘s endings, or output zone, triggers events that may cause only stimulation of adjacent neurons and other cells.
2. The structure of the cells does not vary according to their function when shapes of structures of different types of epithelial tissues are compared.
3. Muscular and neural tissues are absent in organs like lungs and kidneys in humans.
4. Division of labour among cells contributes to the survival of the unicellular organism as a whole.
5. A typical musclefibre of biceps can be described as striped, unbranched and fusiform in appearance and is under the control of our will.
6. Goblet cells of the alimentary canal are clustered glandular cells that are modified squamous epithelial.
7. Blood is a fluid connective tissues containing plasma, RBCs, WBCs, platelets and collagen fibres.
8. Tendons are examples of dense irregular connective tissue that attaches one bone to another.
9. Brush- bordered columnar epithelium lining the intestine helps to increase the absorptive surface area.
10. Tight junctions at intercalated discs at some fusion points in cardiac muscle fibres allow the cells to contract as a unit.
11. Muscle tissue exerts the greatest control over the body’s responsiveness to changing conditions.
12. Bone cells called osteocytes are present in the spaces named lacunae while chondrocytes are smooth cells enclosed in concentrically arranged matrix.
13. Dense connective tissue such as areolar tissue is characterised by the abundant presence of adipocytes and fibroblasts.
14.The cuboidal epithelium of Proximal Convoluted Tubule (PCT) of nephron in the human kidneyhas microvilli.
15. Bronchioles and fallopian tubes are lined by ciliated epithelium where cilia push the mucus and ova in any direction respectively.
16. Specialized connective tissue includes cartilage, bone and blood, while loose connective tissue includes adipose and areolar tissue.
17. The inter cellular material of bones is solid, pliable and resists compression.
18. The supportive skeleton structure present in human outer ear joints, tip of the nose and between adjacent bones of the vertebral column are termed ligaments.
19. Smooth muscles are ‘involuntary’ as their functioning can be directly controlled.
20. The cells lining the blood vessels bring to the category of squamous epithelium characterized by thick layer of cuboid cells with regular boundaries.
21. Intercalated disc is a communication junctions, at some fusion points that allow the smooth muscle fibres to contract as a unit.
22. Ciliated columnar epithelium is primary associated with functions involving formation of diffusion boundary in air sacs of human lungs.
23. Products called hrmones are secreted directly into the fluid bathing the ductless exocrine glands.
24. Neuroglia make up less than one-third the volume of neural tissue in our body.
25. The simple epithelium lining the dry surface of skin, inner lining of ducts of salivary glands and pancreatic ducts plays a major role in secretion and absorption but has limited role in providing protection against mechanical and chemical stresses.
26.The bone marrow in the every bones is the site of production of blood cells.
27. The cells of blood are specialised to convert excess nutrients into fats and store them.
28. Fibres and fibroblasts are not compactly packed in the dense regular connective tissue.
29. The wall of blood vessels, stomach and abdomen contains smooth muscle tissue.
30. Myofibrils are composed of numerous fine fibres, called muscle fibres.
ANSWER
1. (F) 2. (F) 3. (F) 4. (F) 5. (F) 6. (F) 7. (F) 8. (F) 9. (T) 10. (F)
11. (F) 12. (F) 13. (F) 14. (T) 15. (F) 16. (T) 17. (F) 18. (F) 19. (F) 20. (F)
21. (F) 22. (F) 23. (F) 24. (F) 25. (F) 26. (F) 27. (F) 28. (F) 29. (F) 30. (F)
