Q4 of 386 Page 161




(a) Identify Figure A, B and C


(b) Which one of them has heavy deposition of lignin?


(c) Which one of them provides both mechanical strength as well as flexibility?


(d) Which one of them can be modified to form air cavities in awuatic plants?


(e) Which one of them is commercially exploited to obtain Hemp and Jute?

(a) A – Transverse section of collenchyma; B - T.S. parenchyma ;

C - T.S. sclerenchyma fibres.


(b) Sclerenchym tissue has heavy deposition of lignin.


(c) Collenchyma tissue provides both mechanical strength and flexibility.


(d) In aquatic plants, large air cavities are present in parenchyma tissue to given buoyancy to the plants to help them float. Such a modified parenchyma is called aerenchyma.


(e) Fibres of Hemp and Jute are obtained from the sclerenchyma fibres.


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What will happen if

(a) Ligament gets over stretched?


(b) Heparin is absent in blood.


(c) Striated muscles contract rapidly for longer duration.

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What will happen if

(a) Apical meristem is damaged or cut?


(b) Cork is not formed in older stems and roots.


(c) Lymph is not returned to blood?

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(a) Identify the figure. What is its function

(b) Label V and W


(c) Label X, Y and Z


(d) W loses its nucleus in the mature state, still it remains alive. Explain how


 6



(a) Identify figures A and B.


(b) Which is called tesselated and payement epitheliurn?


(c) Which one lines the gastrointestinal tract and epiglottis ?


(d) Which one allows diffusion of substances ?