Tissue Worksheet-23

Tissue Worksheet-23

21. Simple tissues transport water, mineral salts (nutrients) and food material to various parts of plant body.

22. The main function of xylem is to carry water and mineral salts upward from the root to different parts of shoots.

23. Walls of sieve tubes are perforated.

24. The nucleus of each sieve cell degenerates at maturity, cytoplasm persists in the mature cell.

25. The cells of meristematic tissues have prominent vacuoles and a small nucleus.

26. A single large vacuole is present in the cells of sclerenchyma tissues.

27. Blood vessels are present in cartilage tissue.

28. The areolar connective tissue joins skin to muscles and supports internal organs.

29. Leucocytes help in clotting blood.

30. Cuboidal epithelium is found in the inner lining of cheek.

31. Blood and lymph are fluid connective tissues found in animals.

32. Both ligaments and tendons belong to dense regular connective tissue which consists of ordered and densely packed fibres and cells.

33. Skeletal muscles are called involuntary muscles and smooth muscles are called voluntary muscles.

34. Epithelial tissues are also commonly termed as ‘packaging tissue ‘ in animals.

35. Neurons are the structural and functional units of nervous tissue.

36. Hump of camel and blubber of whale has rich adipose tissue for storing fats.

37. Epithelial tissue is protective tissue in animal body.

38. The lining of blood vessels, long alveoli and kidney tubules are all made up of epithelial tissue.

39. Epithelial cells have a lot of permeable layer.

40. Epithelial layer does not allow regulation of materials between body and external environment.

41. The upper layer in a plant tissue is epidermis.

42. Stomata is surrounded by mast cells.

43. Transpiration occurs through stomata.

Answer:

21. False

Explanation: Complex tissues transport water, mineral salts (nutrients) and food material to various parts of plant body.

22. True

23. True

24. True

25. False

Explanation: The cells of meristematic tissues have prominent nucleus and small vacuoles.

26. False

Explanation: Vacoules are either absent or small in the cells of sclerenchyma tissue.

27. False

Explanation: Blood vessles are absent in cartilage tissue.

28. True

29. False

Explanation: Thrombocytes help in blood clotting.

30. True

31. True

32. True

33. False

Explanation: Skeletal muscles are voluntary muscles and smooth muscles are called involuntary muscles.

34. False

Explanation: Epithelial tissues are also commonly termed as 'pavement tissue' in animals.

35. True

36. True

37. True

38. True

39. True

40. False

Explanation: Epithelial layer allow regulation of materials between body and external environment.

41. True

42. False

Explanation: Stomata is surrounded by guard cells.

43. True