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NCERT Solutions for Class 9th Science

 

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Chapter 6. Tissues

Chapter Review

 

 

 

Chapter Review:


  • A group of cells having similar functions and similar structure is known as tissue. 

  • The growth of plants occurs only in certain specific regions. This is because the dividing tissue, also known as meristematic tissue.

  • The xylem carries water and minerals obtained from the soil to the plant.

  • Phloem transports products of photosynthesis from the leaves where they are synthesized to other parts of the plant. 

  • There are many small holes in the leaves of plants. These are called stomata.

  • Parenchyma, collenchyma and sclerenchyma are three types of simple tissues.

  • Xylem consist of :- (i) Tracheids (ii) Vessels (iii) Xylem parenchyma (iv) Xylem fibres. 

  • Phloem made up of:- (i) Sieve tubes (ii) Companion cells (iii) Phloem fibre (iv) Phloem parenchyma.

  • The covering or protective tissues in the animal body are epithelial tissues.

  • Cilia are hair-like projections on the outer surfaces of epithelial cells.

  • Plasma is called a fluid matrix of blood.

  •  Blood and bones are connective tissues.

  • Muscular tissue is responsible for movement of our body.

  •  Muscles present in our limbs move when we want them to, and stop when we so decide. Such muscles are called voluntary muscles.

  • The movement of food in the alimentary canal or the contraction and relaxation of blood vessels are involuntary movements. Such muscles are known as involuntary muscles.

  • The muscles of the heart show rhythmic contraction and relaxation throughout life. These involuntary muscles are called cardiac muscles.

  • Nervous tissue is made of neurons that receive and conduct impulses.

  • Two bones can be connected to each other by another type of connective tissue called the ligamen.

  • Striated, unstriated and cardiac are three types of muscle tissues.

     

     

     

 

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