CBSE Class 9 Science Tissues Assignment Set A

Exam Questions NCERT Class 9 Science Chapter 6 Tissue

Question : What are the two main components of blood? Why is blood considered a type of connective tissue?
Answer :  (i) Blood has two main components :
(a) Fluid (liquid) matrix called plasma.
(b) Suspended red blood cells (RBCs), white blood cells (WBCs) and platelets.
(ii) Blood is considered as connective tissue because :
(a) It has the same origin as the other connective tissues.
(b) It flows to different parts of the body and thus connects different parts of the body with one another to exchange materials and gases.

Question : Why does epidermal tissue not have intercellular space?
or
What is the function of epidermis in plants? 
Answer :  Epidermal tissue forms a protective layer for plants and helps to protect the internal parts of plants which prevent the plant from loss of water, attack by parasitic fungi and outer injury.

Question : Mention the different types of blood cells.
Answer :  (i) WBCs (ii) RBCs (iii) Platelets

Question : Name the tissue which is responsible for the movement of our body?
Answer :  A combination of following two tissues is responsible for the movement of our body : (i) Muscular tissue (ii) Nervous tissue

Question : Mention the functions of cartilage.
Answer :  (i) Support to the body (ii) Flexibility (iii) At joints, smoothens surface

Question : What are the four important types of tissues found in animal?
Answer :  The four animal tissues are :
(i) Epithelial tissues,
(ii) Connective tissues,
(iii) Muscular tissues, and
(iv) Nervous tissue.

Question : What are the three types of muscle fibres (muscle cells)?
Answer :  These are three types of muscle fibres :
1. Striated muscle (skeletal muscle or voluntary muscle),
2. Unstriated muscle (smooth muscle or involuntary muscle),
3. Cardiac muscle.

Question : Name the connective tissue that is found between skin and muscles.
Answer :  Areolar connective tissue fills the space between skin and muscles.

Question : What will happen if ligaments are over stretched?
Answer :  Sprain will occur.

Question : Explain how the bark of a tree is formed. How does it act as a protective tissue?
Answer :  As trees grow old, a strip of secondary meristem replaces the epidermis of the stem. Cell on the outside are cut off this layer. This forms the several layer thick cork or the bark of the tree. Bark is a mass of dead tissue lying in the peripheral region of the plant body as a hard dry covering. Its function is protection. It protects the inner tissues against the attack of fungi and insects, against loss of water by evaporation, etc.

Question : Complete the sentences.
(i) _____ conducts minerals and water.
(ii) _____ conducts food in higher plants.
(iii) Blood is a _____ type of tissue.
(iv) Bone has _____ cells. (v) Cartilage has _____ cells.
(vi) The connective tissue where fibres are not present is _____.
Answer :  (i) Xylem (ii) Phloem (iii) connective (iv) osteocyte (v) chondrocyte (vi) blood

Question : What are the four main functions of epithelial tissue?
Answer :  The main functions of epithelial tissue are :
1. It forms the outer layer of skin and hence it protects the underlying cells from drying, injury, bacterial and chemical effects.
2. It forms lining of mouth, alimentary canal and other internal organs and thus protects these organs.
3. It helps in absorption of water and other nutrients in alimentary canal. Some of them are greatly specialized and perform secretory function.  

Question : Give the types of meristematic tissues.
Answer :  (i) Intercalary tissue — nodes (ii) Apical tissue — tips of shoot and roots (iii) Lateral tissue — stem sides 

Question : What is a cardiac muscle? Mention its features too.
Answer :  Cardiac muscle is an extremely specialized tissue developed to pump blood throughout the body. Features :
(i) Cylindrical in shape
(ii) Branched and single celled
(iii) Striated muscle fibres
(iv) Involuntary in nature 

Question : List any four salient features of meristematic tissue?
Answer :  (i) This tissue consists of actively dividing cells.
(ii) This tissue is present in growing regions of plants.
(iii) In this tissue, cells are packed closely without intercellular spaces.
(iv) Cells of this tissue have thin cell walls, dense cytoplasm and prominent nuclei. 

Question : Mention the functions of cuboidal epithelium.
Answer :  (i) Absorption (ii) Excretion (iii) Secretion (iv) Mechanical support

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