CBSE Class 9 Science Tissues Assignment Set B

Q 1 Give atleast two locations where cartilaginous connective tissue is present in our body.

Q 2 What are the other names of striated muscles?

Q 3 What is middle lamella?

Q 4 Name the meristematic tissue, which increases the thickness of plants.

Q 5 Which tissue makes up the husk of coconut?

Q 6 Write two functions of stomata?

Q 7 How does a neuron look like?

Q 8 Where is apical meristem found?

Q 9 Name types of simple plant tissues.

Q 10 Write a brief note on muscle tissue?

Q 11 What is phloem parenchyma?

Q 12 Draw a diagram of a neuron.

Q 13 Name the following.
a)Tissue that forms the inner lining of our mouth.
b)Tissue that connects muscle to bone in human.
c)Tissue that transports food in plants.
d)Tissue that stores fat in our body.

Q 14 What is the composition of blood?

6. Tissues

Q 1 What is meristem?

Q 2 What is tissue?

Q 3 Name the two types of elements found in phloem.

Q 4 Name two specialized kinds of parenchyma.

Q 5 Name the main components of xylem. Which out of them is most suitable for carrying water?

Q 6 What is permanent tissue?

Q 7 Name the term for the cells having shape and size like parenchyma cells but can do photosynthesis.

Q 8 What is the difference between apical, lateral and intercalary meristem?

Q 9 Why tissues are important in multicellular organisms?

Q 10 What is the function of collenchyma in plants?

Q 11 Which tissue makes the plant hard and stiff and what is the unique property of this tissue?

Q 12 What is the function of epidermis in plants?

Q 13 Which structures of the plant are responsible for exchange of gases and where are these located?

Q 14 What are the properties of xylem tracheids and vessels?

Q 15 What is the function of phloem?

Q 16 Give two examples of lateral meristem.

Q 17 What are the components of phloem?

Exam Questions NCERT Class 9 Science Chapter 6 Tissue

Question. Explain the structure of parenchyma. What are its major modifications?
Ans : Parenchyma : It is the basic or fundamental tissue found in plants. Cells of this tissue are thin walled, circular or polygonal. They are living with a nucleus and a vacuole. Intercellular spaces are present between the cells of this tissue. Two modifications of parenchyma are chlorenchyma and aerenchyma.
(a) Chlorenchyma : Sometimes cells of the parenchyma contain chlorophyll and perform photosynthesis. This kind of parenchyma is known as chlorenchyma.
(b) Aerenchyma : In aquatic plants, parenchyma contains big air spaces in between them. Such a parenchyma tissue is known as aerenchyma.

Question. What is xylem? Explain its structure. Which one of its component is very important and why?
Ans : Xylem is a complex plant tissue which transports water and dissolved minerals from roots to all other plant parts. Structure : Xylem consists of four kinds of cells (also known as elements). Tracheids : A tracheid is an elongated, hollow cell with its both ends tapering. The walls of these cells are thick by the deposition of lignin. At certain spots lignin is not present. These spots are termed as pits. The tracheids are dead cells. Vessels : These are tube-like structures formed by a number of cells placed end to end with their transverse walls dissolved. The side walls of these tubes also have deposition of lignin. The thickening of the walls show various kinds of patterns. They are also dead cells. Xylem Parenchyma : They are prenchymatous, thin walled, living cells. They help in lateral conduction of water and sap. They also store food. Xylem Fibres : They are lignified dead fibres which provide mechanical support to plant. The most important element of xylem is vessel because most of the water and minerals are carried upward through this component of xylem.

Question. Write the various functions of all types of epithelial tissues?
Ans : Epithelial tissues help in protection, absorption, excretion, exchange of respiratory gases and secretion.

Question. Explain connective tissue along with its types.
Ans : Connective tissue consists various types of cells which perform the same function. These are of three types :
(i) Proper connective tissue
(ii) Fluid tissue
(iii) Skeletal tissue
Proper connective tissue : These are of four types–
Areolar and ligament connective tissue : It is present between muscles and skin and in the bone marrow. It is also present around nerves and blood vessels. They fill the space inside the organ. They also provide strength to internal organs and helps in repair of tissues.
Adipose tissue : It is found below the skin and also between internal organs. It stores fat and due to this fat storage, it behaves as an insulator.
Tendon : It is fibrous, strong and flexible and joins muscles with bone.
Ligament : It is elastic and strong and joins bone with bone.
Fluid tissue consists of :
Blood : It is a liquid tissue called plasma which has RBCs, WBCs, plasma and blood platelets. It helps to transport substances like gases, hormones, digested food and waste material. Lymph : It transports digested fat and white blood cells in plasma.
Skeletal tissue is made up of :
Bone : It is a hard tissue which helps in the movement and support of our body.
Cartilage : It softens the bone surface at joints. It is found in our ear, nose, trachea and larynx.

Question. Where is chlorenchyma tissue present?
Ans : It is present in the centre of stems and roots. If it has chlorophyll then it is called chlorenchyma. It is present in green leaves.

Question. What are three main categories of connective tissue?
Ans : Categories of connective tissue are : Connective tissue proper : There is a matrix in which generally two types of (white and yellow) fibres are present. In between these fibres some connective tissue cells are present. Example of this kind of connective tissues are aerolar tissue and adipose tissue. Skeletal tissue : This type of tissues form the skeleton of an organism. It is of two types : Cartilage and bone. a. Cartilage has solid matrix called chondrin, in which fibres and cells known as chondrocytes are present. Usually cells are present in clusters of 2-3 cells in small spaces called lacunae. Cartilage is found in the regions of pinna, nose, trachea and larynx. b. In bones, matrix is formed of a protein called ossein impregnated with phosphate and carbonates of calcium and magnesium. Fluid tissue : Blood and lymph are examples of fluid connective tissues. These are specialized connective tissues. It consists of liquid matrix with no fibres. In liquid matrix called plasma corpuscles remain suspended. Blood transports food material, gases and other substances to the various parts of the body.

Question. Write the main functions of collenchyma?
Ans : The main functions of collenchyma are to provide mechanical support, tensile strength, elasticity and flexibility to stem, leaf stalks and leaves.

Question. What is basement membrane?
Ans : It is very thin non-cellular membrane on which cells of epithelial tissue rest. It also separates the epithelial tissue from the underlying tissues.

Question. Describe the structure of phloem.
Ans : Structure of phloem : The main conducting part of the phloem is sieve tube which is formed of elongated cylindrical cells arranged in vertical rows. The walls between the cells have many minute pores through which food material can pass from one cell to the next. The porous walls between the cells is termed as sieve plate. Each sieve tube member is supported by a long parenchymatous cell called companion cell which helps the sieve tubes in the conduction of food material. Phloem also contains phloem fibres, which provide support. Another component of phloem is parenchyma cells which stores food.

Question. What is the use of tissues in multicellular organisms?
Ans : Tissue provides structural and mechanical strength as well as to allow division of labour in multicellular organisms.

Question. Describe the structure of cartilage and bone.
Ans : Cartilage : It is a solid but semi-rigid and flexible connective tissue. It has large bluntly angular cartilage cells called chondrocytes. They occur in clusters of 2 and 3 in small spaces (lacunae) scattered in the matrix. Cartilage smoothens bone surfaces at joints and is also present in the nose, ear, trachea and larynx. Bone : Bone is a solid, rigid and strong connective tissue. Its matrix become hard due to the deposition of salts of calcium and phosphorous. Osteocytes or bone cells are present in irregular spaces lacunae in the matrix, interconnected by fine canals called canaliculi. In this tissue, matrix deposits in concentric rings around narrow longitudinal cavities called haversian canals. These canals carries blood vessels and nerves.

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