Tissues

1.   What is Histology?

     Ans: The study of Tissue is called Histology.

2.   What is division of labour?

    Ans: In multicellular organisms, there are millions of cells, and these cells are specialised to carry out few functions efficiently. These functions are taken up by group of cells. Thus there is a Division of labour  in multicellular organisms.

3.   What is totipotency?

     Ans: The ability of a single cell to divide and produce all of the differentiated cells in an organism is called Totipotency.eg Spores and Zygotes

4.   What is Cambium?

Ans: A cambium in plants, is a tissue layer that provides partially undifferentiated cells for plant growth. It is found in the area between xylem and phloem.

5.   What are Meristimatic Tissues?

 Ans:  Meristimatic tissues are growth tissues and are found in the growing regions of the plant.

6.   What are the three types of Meristems?

Ans: There are three types of meristimatic tissues:

   a) Apical meristems  (elongation of stems and root)

   b) Lateral meristems (Increase in diameter and girth)

   c) Intercalary meristems (Increase in the length of leaves and    internodes)

7.   What is differentiation?

Ans: The developmental process by which cells derived from meristimatic tissue take up a permanent shape, size and function is called differentiation.

8.   What  are the  different type of permanent tissues in plants?

Ans: Different type of permanent tissue are:

a)   Parenchyma

b)   Collenchyma

c)   Selerenchyma

9.   Which permanent tissue  serves as 'food storage tissue'?

Ans: Parenchyma

10. Which permanent tissue provides mechanical support and elasticity?

   Ans: Collenchyma

11. Which permanent tissue is dead and devoid of any protoplasm?

Ans:  Selerenchyma

12. Which tissue is present in Husk of coconut?

Ans: Selerenchyma

13. What is lignin?

Ans: Legnin is the complex polymer which acts as a cement and hardens cell wall.

14. What is stomata?

Ans: Stomata  are the small pores that are present on the epidermis of the leaf. Each stoma is bounded by a pair of specialized  epidermal cells or two kidney-shaped cells called guard cells.

15. What are the components of Xylem tissue?

Ans: Xylem tissue  is made up of 4 different types of cells:

a)   Tracheids

b)   Vessels

c)   Xylem parenchyma

d)   Xylem Sclerenchyma (fibre)

16. What are the components of Phloem tissue?

Ans: Phloem is composed of 4 cells:

a)   Sieve Tubes

b)   Companion cells

c)   Phloem parenchyma

d)   Phloem fibres