Tissues class 9th

(Q.)Which tissue makes up the husk of coconut?

 (Ans)  Sclerenchyma (fibres)

(Q.)What is middle lamella?

 (Ans)  Wall between adjacent plant cells is known as middle lamella.

(Q.)Write two functions of stomata? 

 (Ans)  (i) Gaseous exchange (ii) Transpiration

(Q.)Name the tissue in which the matrix is not produced by the cells present in it.

(Ans)  Blood

(Q.)What is the unique property of sieve tubes?

(Ans)  Perforated walls.

(Q.)Write a brief note on muscle tissue?

 (Ans)  Muscle tissue consists of elongated cells called muscle fibres which have the ability to contract and relax. These are made up of special contractile proteins. Muscle tissues are responsible for the movement in our body.

(Q.)What is the function of collenchyma in plants?

(Ans)  Collenchyma allows flexibility in plants and easy bending in various parts of the plants without breaking. It also provides mechanical support to plants.

(Q.)What is the function of epidermis in plants?

(Ans)  It protects all the parts of the plant. Epidermal cells on the aerial parts of the plant secrete a waxy, water-resistant layer on their outer surface which aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.

(Q.)What are the properties of xylem tracheids and vessels?

(Ans)  Xylem tracheids and vessels are dead cells and have lignified walls. In addition to conduction, these tissues serve to conduct water and also provide support.

(Q.)What is the function of xylem parenchyma and xylem fibres?

(Ans)  Xylem parenchyma stores food and helps in the sideways conduction of water while xylem fibres are mainly supportive in function.

(Q.)Where is cuboidal epithelium located?

(Ans)  Cuboidal epithelium is located in the glands and in the lining of the kidney tubules as well as in the ducts of the glands.

(Q.)What are the different types of epithelial tissue?

(Ans)  Squamous epithelium, cuboidal epithelium, columnar epithelium, ciliated epithelium,stratified, pseudostratified and glandular epithelium.

(Q.)What is the function of columnar epithelium in respiratory tract?

(Ans)  In the respiratory tract, the columnar epithelial tissue has cilia, which are hair-like projections on the outer surfaces of epithelial cells. These cilia move and their movement pushes the mucus forward to clear it.

(Q.)Write the function of areolar tissue.

(Ans)  It fills the space inside the organs, supports internal organs and helps in repair of tissues.

(Q.)What is the property of cartilage?

(Ans)  Cartilage has widely spaced cells called chondrocytes. Its solid matrix is composed of chondoitin . It provides support and flexibility to various structures like joints.

(Q.)Write the properties of voluntary muscles.

(Ans)  These muscles are made up of muscle fibres which are multinucleated, cylindrical and unbranched cells with light and dark bands (striations). These are under voluntary control and are associated with the skeletal system.

(Q.)Why cardiac muscles are unique?

(Ans)  These are uninucleated, cylindrical, branched cells with light and dark bands. These are present in heart and show rhythmic contraction and relaxation throughout life.

(Q.)What are neurons?

(Ans)
Neurons are the basic unit of the nervous system and consists of a cell body, a long axon and many short branches called dendrites. These help in transmission of signals within the body.