15. Answer in detail I

 

a. Permanent tissues are those in which growth has stopped either completely or for the time being TrueFalse.

 

b. Structurally similar cells that perform similar functions and occur in homogenous groups are called complex permanent tissuesimple permanent tissue.

 

c. Which is the simplest, unspecialised, most primitive, most abundant permanent tissue that evolved first? ParenchymaCollenchyma.

 

d. In some cases, when exposed to light, parenchyma tissue may develop chloroplasts that contain chlorophyll and are involved in the process of photosynthesis. This type of parenchyma tissue is called collenchymachlorenchyma.

 

e. In aquatic plants, parenchyma tissues have intercellular air spaces, facilitating floating inside the water. This floating is because of the buoyancy provided by the parenchyma cells. This type of parenchyma tissue is called aerenchymachlorenchyma.

 

f. Parenchyma is a living tissue found beneath the epidermis, and the cells are elongated with unevenly thickened non-lignified walls FalseTrue.

 

g. Which are the most hardened plant tissue, and the tissue's cell walls are uniformly thickened due to lignin? ParenchymaSclerenchyma.

 

h. Elongated sclerenchymatous cells and the walls are lignified, usually with pointed ends. They are called fibressclereids.

i. Which tissue gives flexibility and elasticity to the plant and prevents the tearing of leaves? SclerenchymaCollenchyma.

 

j. Sclereids are also common in fruits and seeds. These are also called germ cellsgrit cells .