Q38 of 57 Page 45

Name the different components of xylem and draw a living component?

The different components of xylem are- tracheids, vessel elements, xylem fibers and xylem parenchyma. Tracheids, vessel elements and xylem fibers are dead cells of the xylem. The only living cells of xylem are parenchyma cells. Either tracheids or vessel elements are found in one xylem tissue.

Living component of xylem is Xylem parenchyma.



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36

Match the column (A) with the column (B)











(A)



(B)



(a) Parenchyma


(b) Photosynthesis


(c) Aerenchyma


(d) Collenchyma


(e) Permanent tissue



(i) Thin walled, packing cells


(ii) Carbon fixation


(iii)Localized thickenings


(iv) Buoyancy


(v) Sclerenchyma


 37

If a potted plant is covered with a glass jar, water vapors appear on the wall of glass jar. Explain why?

 39

Draw and identify different elements of phloem.

 40

Write true (T) or false (F)

(a) Epithelial tissue is protective tissue in animal body.


(b) The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue.


(c) Epithelial cells have a lot of intercellular spaces.


(d) Epithelial layer is permeable layer.


(e) Epithelial layer does not allow regulation of materials between body and external environment.